| Abbottia F. Muell. | Timonius DC. | | | Abbottia F. Muell. | Timonius DC. | Rubiaceae |
| Abramsia Gillespie | Airosperma Lauterb. & K. Schum. | | | Abramsia Gillespie | Airosperma Lauterb. & K. Schum. | Rubiaceae |
| Acmostima Raf. | Pavetta L. | | | Acmostima Raf. | Pavetta L. | Rubiaceae |
| Acranthera Arn. ex Meisn. | | a | | Acranthera Arn. ex Meisn. | | Rubiaceae |
| Acrobotrys K. Schum. & K. Krause | | a | | Acrobotrys K. Schum. & K. Krause | | Rubiaceae |
| Acrodryon Spreng. | Cephalanthus L. | | | Acrodryon Spreng. | Cephalanthus L. | Rubiaceae |
| Acrostoma Didr. | Remijia DC. | | | Acrostoma Didr. | Remijia DC. | Rubiaceae |
| Acrosynanthus Urb. | | a | | Acrosynanthus Urb. | | Rubiaceae |
| Acunaeanthus Borhidi et al. | | a | | Acunaeanthus Borhidi et al. | | Rubiaceae |
| Adenorandia Vermoesen | | a | | Adenorandia Vermoesen | | Rubiaceae |
| Adenosacme Wall. ex Miq. | Mycetia Reinw. | | | Adenosacme Wall. ex Miq. | Mycetia Reinw. | Rubiaceae |
| Adenothola Lem. | Manettia Mutis | | | Adenothola Lem. | Manettia Mutis | Rubiaceae |
| Adina Salisb. | | a | | Adina Salisb. | | Rubiaceae |
| Adinauclea Ridsdale | | a | | Adinauclea Ridsdale | | Rubiaceae |
| Aeginetia Cav. | Bouvardia Salisb. | | | Aeginetia Cav. | Bouvardia Salisb. | Rubiaceae |
| Aetheonema Rchb. | Gaertnera Lam. | | | Aetheonema Rchb. | Gaertnera Lam. | Rubiaceae |
| Afrocanthium (Bridson) Lantz & B. Bremer | | a | | Afrocanthium (Bridson) Lantz & B. Bremer | | Rubiaceae |
| Afrohamelia Wernham | Atractogyne Pierre | | | Afrohamelia Wernham | Atractogyne Pierre | Rubiaceae |
| Afroknoxia Verdc. | Knoxia L. | | | Afroknoxia Verdc. | Knoxia L. | Rubiaceae |
| Agathisanthemum Klotzsch | | a | | Agathisanthemum Klotzsch | | Rubiaceae |
| Agouticarpa C. H. Perss. | | a | | Agouticarpa C. H. Perss. | | Rubiaceae |
| Agylophora Neck. ex Raf., nom. inval. | Uncaria Schreb. | | | Agylophora Neck. ex Raf., nom. inval. | Uncaria Schreb. | Rubiaceae |
| Aidia Lour. | | a | | Aidia Lour. | | Rubiaceae |
| Aidiopsis Tirveng. | | a | | Aidiopsis Tirveng. | | Rubiaceae |
| Airosperma Lauterb. & K. Schum. | | a | | Airosperma Lauterb. & K. Schum. | | Rubiaceae |
| Aitchisonia Hemsl. ex Aitch. | | a | | Aitchisonia Hemsl. ex Aitch. | | Rubiaceae |
| Alberta E. Mey. | | a | | Alberta E. Mey. | | Rubiaceae |
| Aleisanthia Ridl. | | a | | Aleisanthia Ridl. | | Rubiaceae |
| Aleisanthiopsis Tange | | a | | Aleisanthiopsis Tange | | Rubiaceae |
| Alibertia A. Rich. ex DC. | | a | | Alibertia A. Rich. ex DC. | | Rubiaceae |
| Allaeophania Thwaites | | a | | Allaeophania Thwaites | | Rubiaceae |
| Alleizettea Dubard & Dop | Danais Comm. ex Vent. | | | Alleizettea Dubard & Dop | Danais Comm. ex Vent. | Rubiaceae |
| Alleizettella Pit. | | a | | Alleizettella Pit. | | Rubiaceae |
| Allenanthus Standl. | | a | | Allenanthus Standl. | | Rubiaceae |
| Alseis Schott | | a | | Alseis Schott | | Rubiaceae |
| Amaioua Aubl. | | a | | Amaioua Aubl. | | Rubiaceae |
| Amaracarpus Blume | | a | | Amaracarpus Blume | | Rubiaceae |
| Amaralia Welw. ex Benth. & Hook. f. | Sherbournia G. Don | | | Amaralia Welw. ex Benth. & Hook. f. | Sherbournia G. Don | Rubiaceae |
| Ambraria Heist. ex Fabr. | Anthospermum L. | | | Ambraria Heist. ex Fabr. | Anthospermum L. | Rubiaceae |
| Ammianthus Spruce ex Benth. | Retiniphyllum Humb. & Bonpl. | | | Ammianthus Spruce ex Benth. | Retiniphyllum Humb. & Bonpl. | Rubiaceae |
| Amphiasma Bremek. | | a | | Amphiasma Bremek. | | Rubiaceae |
| Amphidasya Standl. | | a | | Amphidasya Standl. | | Rubiaceae |
| Amphistemon Groeninckx | | a | | Amphistemon Groeninckx | | Rubiaceae |
| Ancylanthos Desf. | Vangueria Juss. | | | Ancylanthos Desf. | Vangueria Juss. | Rubiaceae |
| Andersonia Willd., nom. inval. | Gaertnera Lam. | | | Andersonia Willd., nom. inval. | Gaertnera Lam. | Rubiaceae |
| Androtropis R. Br. | Acranthera Arn. ex Meisn. | | | Androtropis R. Br. | Acranthera Arn. ex Meisn. | Rubiaceae |
| Anisomeris C. Presl | Chomelia Jacq. | | | Anisomeris C. Presl | Chomelia Jacq. | Rubiaceae |
| Anistelma Raf. | Hedyotis L. | | | Anistelma Raf. | Hedyotis L. | Rubiaceae |
| Anomanthodia Hook. f. | | a | | Anomanthodia Hook. f. | | Rubiaceae |
| Anotis DC. | Arcytophyllum Willd. ex Schult. & Schult. f. | | | Anotis DC. | Arcytophyllum Willd. ex Schult. & Schult. f. | Rubiaceae |
| Antacanthus A. Rich. ex DC. | Scolosanthus Vahl | | | Antacanthus A. Rich. ex DC. | Scolosanthus Vahl | Rubiaceae |
| Antherostele Bremek. | | a | | Antherostele Bremek. | | Rubiaceae |
| Antherura Lour. | Psychotria L. | | | Antherura Lour. | Psychotria L. | Rubiaceae |
| Anthocephalus A. Rich. | Breonia A. Rich. ex DC. | | | Anthocephalus A. Rich. | Breonia A. Rich. ex DC. | Rubiaceae |
| Anthorrhiza C. R. Huxley & Jebb | | a | | Anthorrhiza C. R. Huxley & Jebb | | Rubiaceae |
| Anthospermopsis (K. Schum.) J. H. Kirkbr. | | a | | Anthospermopsis (K. Schum.) J. H. Kirkbr. | | Rubiaceae |
| Anthospermum L. | | a | | Anthospermum L. | | Rubiaceae |
| Antirhea Comm. ex Juss. | | a | | Antirhea Comm. ex Juss. | | Rubiaceae |
| Antirhoea Comm. ex Juss. | Antirhea Comm. ex Juss. | | | Antirhoea Comm. ex Juss. | Antirhea Comm. ex Juss. | Rubiaceae |
| Antirrhoea Endl. | Antirhea Comm. ex Juss. | | | Antirrhoea Endl. | Antirhea Comm. ex Juss. | Rubiaceae |
| Antoniana Tussac | Faramea Aubl. | | | Antoniana Tussac | Faramea Aubl. | Rubiaceae |
| Aoranthe Somers | | a | | Aoranthe Somers | | Rubiaceae |
| Aparinanthus Fourr. | Galium L. | | | Aparinanthus Fourr. | Galium L. | Rubiaceae |
| Aparine Guett. | Galium L. | | | Aparine Guett. | Galium L. | Rubiaceae |
| Aparinella Fourr. | Galium L. | | | Aparinella Fourr. | Galium L. | Rubiaceae |
| Aphaenandra Miq. | Mussaenda L. | | | Aphaenandra Miq. | Mussaenda L. | Rubiaceae |
| Aphanocarpus Steyerm. | | a | | Aphanocarpus Steyerm. | | Rubiaceae |
| Apomuria Bremek. | Psychotria L. | | | Apomuria Bremek. | Psychotria L. | Rubiaceae |
| Appunettia R. D. Good | | a | | Appunettia R. D. Good | | Rubiaceae |
| Appunia Hook. f. | | a | | Appunia Hook. f. | | Rubiaceae |
| Arachnimorpha Desv. | Rondeletia L. | | | Arachnimorpha Desv. | Rondeletia L. | Rubiaceae |
| Arachnothryx Planch. | | a | | Arachnothryx Planch. | | Rubiaceae |
| Arariba Mart. | Simira Aubl. | | | Arariba Mart. | Simira Aubl. | Rubiaceae |
| Arbulocarpus Tennant | Spermacoce L. | | | Arbulocarpus Tennant | Spermacoce L. | Rubiaceae |
| Arcytophyllum Willd. ex Schult. & Schult. f. | | a | | Arcytophyllum Willd. ex Schult. & Schult. f. | | Rubiaceae |
| Argocoffea (Pierre ex De Wild.) Lebrun, nom. inval. | Argocoffeopsis Lebrun | | | Argocoffea (Pierre ex De Wild.) Lebrun, nom. inval. | Argocoffeopsis Lebrun | Rubiaceae |
| Argocoffeopsis Lebrun | | a | | Argocoffeopsis Lebrun | | Rubiaceae |
| Argostemma Wall. | | a | | Argostemma Wall. | | Rubiaceae |
| Argostemmella Ridl. | Argostemma Wall. | | | Argostemmella Ridl. | Argostemma Wall. | Rubiaceae |
| Ariadne Urb. | Phyllomelia Griseb. | | | Ariadne Urb. | Phyllomelia Griseb. | Rubiaceae |
| Asemanthia (Stapf) Ridl. | Mussaenda L. | | | Asemanthia (Stapf) Ridl. | Mussaenda L. | Rubiaceae |
| Asemnantha Hook. f. | | a | | Asemnantha Hook. f. | | Rubiaceae |
| Aspera Moench | Galium L. | | | Aspera Moench | Galium L. | Rubiaceae |
| Asperula L. | | a | | Asperula L. | | Rubiaceae |
| Aspidanthera Benth. | Ferdinandusa Pohl | | | Aspidanthera Benth. | Ferdinandusa Pohl | Rubiaceae |
| Assidora A. Chev. | Schumanniophyton Harms | | | Assidora A. Chev. | Schumanniophyton Harms | Rubiaceae |
| Asterophyllum Schimp. & Spenn. | Asperula L. | | | Asterophyllum Schimp. & Spenn. | Asperula L. | Rubiaceae |
| Astiella Jovet | | a | | Astiella Jovet | | Rubiaceae |
| Atractocarpus Schltr. & K. Krause | | a | | Atractocarpus Schltr. & K. Krause | | Rubiaceae |
| Atractogyne Pierre | | a | | Atractogyne Pierre | | Rubiaceae |
| Aucubaephyllum Ahlb. | Psychotria L. | | | Aucubaephyllum Ahlb. | Psychotria L. | Rubiaceae |
| Augusta Pohl | | a | | Augusta Pohl | | Rubiaceae |
| Augustea DC., orth. var. | Augusta Pohl | | | Augustea DC., orth. var. | Augusta Pohl | Rubiaceae |
| Aulacocalyx Hook. f. | | a | | Aulacocalyx Hook. f. | | Rubiaceae |
| Aulacodiscus Hook. f. | Pleiocarpidia K. Schum. | | | Aulacodiscus Hook. f. | Pleiocarpidia K. Schum. | Rubiaceae |
| Axanthes Blume | Urophyllum Wall. | | | Axanthes Blume | Urophyllum Wall. | Rubiaceae |
| Axanthopsis Korth. | Urophyllum Wall. | | | Axanthopsis Korth. | Urophyllum Wall. | Rubiaceae |
| Axolus Raf. | Cephalanthus L. | | | Axolus Raf. | Cephalanthus L. | Rubiaceae |
| Baconia DC. | Pavetta L. | | | Baconia DC. | Pavetta L. | Rubiaceae |
| Badusa A. Gray | | a | | Badusa A. Gray | | Rubiaceae |
| Balfourina Kuntze | Didymaea Hook. f. | | | Balfourina Kuntze | Didymaea Hook. f. | Rubiaceae |
| Balmea Martínez | | a | | Balmea Martínez | | Rubiaceae |
| Bamboga Baill., orth. var. | Mitragyna Korth. | | | Bamboga Baill., orth. var. | Mitragyna Korth. | Rubiaceae |
| Bancalus Kuntze | Nauclea L. | | | Bancalus Kuntze | Nauclea L. | Rubiaceae |
| Bartlingia Rchb. | Plocama Aiton | | | Bartlingia Rchb. | Plocama Aiton | Rubiaceae |
| Basanacantha Hook. f. | Randia L. | | | Basanacantha Hook. f. | Randia L. | Rubiaceae |
| Bataprine Nieuwl. | | a | | Bataprine Nieuwl. | | Rubiaceae |
| Bathysa C. Presl | | a | | Bathysa C. Presl | | Rubiaceae |
| Bathysograya Kuntze | Badusa A. Gray | | | Bathysograya Kuntze | Badusa A. Gray | Rubiaceae |
| Batopedina Verdc. | | a | | Batopedina Verdc. | | Rubiaceae |
| Baumannia K. Schum. | Knoxia L. | | | Baumannia K. Schum. | Knoxia L. | Rubiaceae |
| Baumannia DC. | Damnacanthus C. F. Gaertn. | | | Baumannia DC. | Damnacanthus C. F. Gaertn. | Rubiaceae |
| Becheria Ridl. | | a | | Becheria Ridl. | | Rubiaceae |
| Belicea Lundell | Morinda L. | | | Belicea Lundell | Morinda L. | Rubiaceae |
| Belilla Adans. | Mussaenda L. | | | Belilla Adans. | Mussaenda L. | Rubiaceae |
| Bellardia Schreb. | Coccocypselum P. Browne | | | Bellardia Schreb. | Coccocypselum P. Browne | Rubiaceae |
| Bellizinca Borhidi | Deppea Cham. & Schltdl. | | | Bellizinca Borhidi | Deppea Cham. & Schltdl. | Rubiaceae |
| Bellynkxia Müll. Arg. | Appunia Hook. f. | | | Bellynkxia Müll. Arg. | Appunia Hook. f. | Rubiaceae |
| Belonophora Hook. f. | | a | | Belonophora Hook. f. | | Rubiaceae |
| Bemsetia Raf. | Ixora L. | | | Bemsetia Raf. | Ixora L. | Rubiaceae |
| Benkara Adans. | | a | | Benkara Adans. | | Rubiaceae |
| Benteca Adans. | Hymenodictyon Wall. | | | Benteca Adans. | Hymenodictyon Wall. | Rubiaceae |
| Benzonia Schumach. | | a | | Benzonia Schumach. | | Rubiaceae |
| Berghesia Nees | | a | | Berghesia Nees | | Rubiaceae |
| Berghias Juss. | Gardenia J. Ellis | | | Berghias Juss. | Gardenia J. Ellis | Rubiaceae |
| Bergkias Sonn. | Gardenia J. Ellis | | | Bergkias Sonn. | Gardenia J. Ellis | Rubiaceae |
| Berthiera Vent., orth. var. | Bertiera Aubl. | | | Berthiera Vent., orth. var. | Bertiera Aubl. | Rubiaceae |
| Bertiera Aubl. | | a | | Bertiera Aubl. | | Rubiaceae |
| Bertuchia Dennst. | Gardenia J. Ellis | | | Bertuchia Dennst. | Gardenia J. Ellis | Rubiaceae |
| Bigelovia Spreng. | Spermacoce L. | | | Bigelovia Spreng. | Spermacoce L. | Rubiaceae |
| Bikkia Reinw. | | a | | Bikkia Reinw. | | Rubiaceae |
| Bikkiopsis Brongn. & Gris | Bikkia Reinw. | | | Bikkiopsis Brongn. & Gris | Bikkia Reinw. | Rubiaceae |
| Billardiera Vahl | Coussarea Aubl. | | | Billardiera Vahl | Coussarea Aubl. | Rubiaceae |
| Billiotia G. Don, orth. var. | Melanopsidium Colla | | | Billiotia G. Don, orth. var. | Melanopsidium Colla | Rubiaceae |
| Billiottia DC. | Melanopsidium Colla | | | Billiottia DC. | Melanopsidium Colla | Rubiaceae |
| Blandibractea Wernham | Simira Aubl. | | | Blandibractea Wernham | Simira Aubl. | Rubiaceae |
| Blepharidium Standl. | | a | | Blepharidium Standl. | | Rubiaceae |
| Blepharostemma Fourr. | Asperula L. | | | Blepharostemma Fourr. | Asperula L. | Rubiaceae |
| Bobea Gaudich. | | a | | Bobea Gaudich. | | Rubiaceae |
| Boholia Merr. | | a | | Boholia Merr. | | Rubiaceae |
| Bonatia Schltr. & K. Krause | Tarenna Gaertn. | | | Bonatia Schltr. & K. Krause | Tarenna Gaertn. | Rubiaceae |
| Bonifacia Silva Manso ex Steud. | Augusta Pohl | | | Bonifacia Silva Manso ex Steud. | Augusta Pohl | Rubiaceae |
| Borojoa Cuatrec. | | a | | Borojoa Cuatrec. | | Rubiaceae |
| Borrera Spreng., orth. var. | Spermacoce L. | | | Borrera Spreng., orth. var. | Spermacoce L. | Rubiaceae |
| Borreria G. Mey. | Spermacoce L. | | | Borreria G. Mey. | Spermacoce L. | Rubiaceae |
| Bothriospora Hook. f. | | a | | Bothriospora Hook. f. | | Rubiaceae |
| Botryarrhena Ducke | | a | | Botryarrhena Ducke | | Rubiaceae |
| Bouvardia Salisb. | | a | | Bouvardia Salisb. | | Rubiaceae |
| Bradea Standl. | | a | | Bradea Standl. | | Rubiaceae |
| Brachytome Hook. f. | | a | | Brachytome Hook. f. | | Rubiaceae |
| Bremeria Razafim. & Alejandro | | a | | Bremeria Razafim. & Alejandro | | Rubiaceae |
| Brenania Keay | | a | | Brenania Keay | | Rubiaceae |
| Breonadia Ridsdale | | a | | Breonadia Ridsdale | | Rubiaceae |
| Breonia A. Rich. ex DC. | | a | | Breonia A. Rich. ex DC. | | Rubiaceae |
| Bridsonia Verstraete & A. E. van Wyk | | a | | Bridsonia Verstraete & A. E. van Wyk | | Rubiaceae |
| Brignolia DC. | Isertia Schreb. | | | Brignolia DC. | Isertia Schreb. | Rubiaceae |
| Bruinsmania Miq. | Isertia Schreb. | | | Bruinsmania Miq. | Isertia Schreb. | Rubiaceae |
| Bubalina Raf. | Burchellia R. Br. | | | Bubalina Raf. | Burchellia R. Br. | Rubiaceae |
| Buena Pohl | Cosmibuena Ruiz & Pav. | | | Buena Pohl | Cosmibuena Ruiz & Pav. | Rubiaceae |
| Buena Cav. | Gonzalagunia Ruiz & Pav. | | | Buena Cav. | Gonzalagunia Ruiz & Pav. | Rubiaceae |
| Buchia Kunth | Perama Aubl. | | | Buchia Kunth | Perama Aubl. | Rubiaceae |
| Buchozia LʼHér. ex Juss. | Serissa Comm. ex Juss. | | | Buchozia LʼHér. ex Juss. | Serissa Comm. ex Juss. | Rubiaceae |
| Bullockia (Bridson) Razafim. et al. | | a | | Bullockia (Bridson) Razafim. et al. | | Rubiaceae |
| Bunburya Meisn. ex Hochst. | Tricalysia A. Rich. ex DC. | | | Bunburya Meisn. ex Hochst. | Tricalysia A. Rich. ex DC. | Rubiaceae |
| Bungarimba K. M. Wong | | a | | Bungarimba K. M. Wong | | Rubiaceae |
| Bunophila Willd. | Machaonia Humb. & Bonpl. | | | Bunophila Willd. | Machaonia Humb. & Bonpl. | Rubiaceae |
| Bupleuroides Moench | Phyllis L. | | | Bupleuroides Moench | Phyllis L. | Rubiaceae |
| Burchellia R. Br. | | a | | Burchellia R. Br. | | Rubiaceae |
| Burneya Cham. & Schltdl. | Timonius DC. | | | Burneya Cham. & Schltdl. | Timonius DC. | Rubiaceae |
| Burttdavya Hoyle | | a | | Burttdavya Hoyle | | Rubiaceae |
| Buseria T. Durand | Coffea L. | | | Buseria T. Durand | Coffea L. | Rubiaceae |
| Byrsophyllum Hook. f. | | a | | Byrsophyllum Hook. f. | | Rubiaceae |
| Cadamba Sonn. | Guettarda L. | | | Cadamba Sonn. | Guettarda L. | Rubiaceae |
| Caelospermum Blume, orth. var. | Coelospermum Blume | | | Caelospermum Blume, orth. var. | Coelospermum Blume | Rubiaceae |
| Cafe Adans. | Coffea L. | | | Cafe Adans. | Coffea L. | Rubiaceae |
| Calanda K. Schum. | Pentanisia Harv. | | | Calanda K. Schum. | Pentanisia Harv. | Rubiaceae |
| Calderonia Standl. | Simira Aubl. | | | Calderonia Standl. | Simira Aubl. | Rubiaceae |
| Callicocca Schreb. | Psychotria L. | | | Callicocca Schreb. | Psychotria L. | Rubiaceae |
| Callipeltis Steven | | a | | Callipeltis Steven | | Rubiaceae |
| Calochone Keay | | a | | Calochone Keay | | Rubiaceae |
| Calycodendron A. C. Sm. | Psychotria L. | | | Calycodendron A. C. Sm. | Psychotria L. | Rubiaceae |
| Calycophyllum DC. | | a | | Calycophyllum DC. | | Rubiaceae |
| Calycosia A. Gray | | a | | Calycosia A. Gray | | Rubiaceae |
| Calycosiphonia Pierre ex Robbr. | | a | | Calycosiphonia Pierre ex Robbr. | | Rubiaceae |
| Campanocalyx Valeton | Keenania Hook. f. | | | Campanocalyx Valeton | Keenania Hook. f. | Rubiaceae |
| Camptophytum Pierre ex A. Chev., nom. inval. | Tarenna Gaertn. | | | Camptophytum Pierre ex A. Chev., nom. inval. | Tarenna Gaertn. | Rubiaceae |
| Camptopus Hook. f. | Psychotria L. | | | Camptopus Hook. f. | Psychotria L. | Rubiaceae |
| Campylobotrys Lem. | Hoffmannia Sw. | | | Campylobotrys Lem. | Hoffmannia Sw. | Rubiaceae |
| Canephora Juss. | | a | | Canephora Juss. | | Rubiaceae |
| Canthiopsis Seem. | Tarenna Gaertn. | | | Canthiopsis Seem. | Tarenna Gaertn. | Rubiaceae |
| Canthium Lam. | | a | | Canthium Lam. | | Rubiaceae |
| Canthopsis Miq. | Catunaregam Wolf | | | Canthopsis Miq. | Catunaregam Wolf | Rubiaceae |
| Capirona Spruce | | a | | Capirona Spruce | | Rubiaceae |
| Caprosma G. Don, orth. var. | Coprosma J. R. Forst. & G. Forst. | | | Caprosma G. Don, orth. var. | Coprosma J. R. Forst. & G. Forst. | Rubiaceae |
| Captaincookia N. Hallé | | a | | Captaincookia N. Hallé | | Rubiaceae |
| Caquepiria J. F. Gmel. | Gardenia J. Ellis | | | Caquepiria J. F. Gmel. | Gardenia J. Ellis | Rubiaceae |
| Carajasia R. M. Salas et al. | | a | | Carajasia R. M. Salas et al. | | Rubiaceae |
| Caranda Gaertn. | Psydrax Gaertn. | | | Caranda Gaertn. | Psydrax Gaertn. | Rubiaceae |
| Carapichea Aubl. | | a | | Carapichea Aubl. | | Rubiaceae |
| Carinta W. Wight | Geophila D. Don | | | Carinta W. Wight | Geophila D. Don | Rubiaceae |
| Carmenocania Wernham | Pogonopus Klotzsch | | | Carmenocania Wernham | Pogonopus Klotzsch | Rubiaceae |
| Carpacoce Sond. | | a | | Carpacoce Sond. | | Rubiaceae |
| Carphalea Juss. | | a | | Carphalea Juss. | | Rubiaceae |
| Carpothalis E. Mey. | Tricalysia A. Rich. ex DC. | | | Carpothalis E. Mey. | Tricalysia A. Rich. ex DC. | Rubiaceae |
| Carterella Terrell | | a | | Carterella Terrell | | Rubiaceae |
| Caruelina Kuntze | Chomelia Jacq. | | | Caruelina Kuntze | Chomelia Jacq. | Rubiaceae |
| Caryococca Willd. ex Roem. & Schult., nom. inval. | Gonzalagunia Ruiz & Pav. | | | Caryococca Willd. ex Roem. & Schult., nom. inval. | Gonzalagunia Ruiz & Pav. | Rubiaceae |
| Casasia A. Rich. | | a | | Casasia A. Rich. | | Rubiaceae |
| Cascarilla (Endl.) Wedd. | Ladenbergia Klotzsch | | | Cascarilla (Endl.) Wedd. | Ladenbergia Klotzsch | Rubiaceae |
| Cassupa Humb. & Bonpl. | Isertia Schreb. | | | Cassupa Humb. & Bonpl. | Isertia Schreb. | Rubiaceae |
| Catesbaea Gronov. | | a | | Catesbaea Gronov. | | Rubiaceae |
| Catesbya Cothen., orth. var. | Catesbaea Gronov. | | | Catesbya Cothen., orth. var. | Catesbaea Gronov. | Rubiaceae |
| Cattutella Rchb. | Wendlandia Bartl. ex DC. | | | Cattutella Rchb. | Wendlandia Bartl. ex DC. | Rubiaceae |
| Catunaregam Wolf | | a | | Catunaregam Wolf | | Rubiaceae |
| Censcus Gaertn. | Catunaregam Wolf | | | Censcus Gaertn. | Catunaregam Wolf | Rubiaceae |
| Cephaelis Sw. | Psychotria L. | | | Cephaelis Sw. | Psychotria L. | Rubiaceae |
| Cephalanthus L. | | a | | Cephalanthus L. | | Rubiaceae |
| Cephaleis Vahl, orth. var. | Psychotria L. | | | Cephaleis Vahl, orth. var. | Psychotria L. | Rubiaceae |
| Cephalidium A. Rich. ex DC. | Breonia A. Rich. ex DC. | | | Cephalidium A. Rich. ex DC. | Breonia A. Rich. ex DC. | Rubiaceae |
| Cephalina Thonn. | Sarcocephalus Afzel. ex Sabine | | | Cephalina Thonn. | Sarcocephalus Afzel. ex Sabine | Rubiaceae |
| Cephalodendron Steyerm. | | a | | Cephalodendron Steyerm. | | Rubiaceae |
| Ceratites Sol. ex Miers | Rudgea Salisb. | | | Ceratites Sol. ex Miers | Rudgea Salisb. | Rubiaceae |
| Ceratopyxis Hook. f. | | a | | Ceratopyxis Hook. f. | | Rubiaceae |
| Ceriscoides (Hook. f.) Tirveng. | | a | | Ceriscoides (Hook. f.) Tirveng. | | Rubiaceae |
| Ceriscus Gaertn. ex Nees, nom. inval. | Catunaregam Wolf | | | Ceriscus Gaertn. ex Nees, nom. inval. | Catunaregam Wolf | Rubiaceae |
| Ceuthocarpus Aiello | | a | | Ceuthocarpus Aiello | | Rubiaceae |
| Cigarilla Aiello, orth. var. | Cigarrilla Aiello | | | Cigarilla Aiello, orth. var. | Cigarrilla Aiello | Rubiaceae |
| Cigarrilla Aiello | | a | | Cigarrilla Aiello | | Rubiaceae |
| Ciliosemina Antonelli | | a | | Ciliosemina Antonelli | | Rubiaceae |
| Cinchona L. | | a | | Cinchona L. | | Rubiaceae |
| Cinchonopsis L. Andersson | | a | | Cinchonopsis L. Andersson | | Rubiaceae |
| Cladoceras Bremek. | | a | | Cladoceras Bremek. | | Rubiaceae |
| Clarkella Hook. f. | | a | | Clarkella Hook. f. | | Rubiaceae |
| Clavenna Neck. ex Standl., orth. var. | Lucya DC. | | | Clavenna Neck. ex Standl., orth. var. | Lucya DC. | Rubiaceae |
| Clavennaea Neck. ex Post & Kuntze | Lucya DC. | | | Clavennaea Neck. ex Post & Kuntze | Lucya DC. | Rubiaceae |
| Cleisocratera Korth. | Saprosma Blume | | | Cleisocratera Korth. | Saprosma Blume | Rubiaceae |
| Clusiophyllea Baill. | Canthium Lam. | | | Clusiophyllea Baill. | Canthium Lam. | Rubiaceae |
| Coccocypselum P. Browne | | a | | Coccocypselum P. Browne | | Rubiaceae |
| Coccochondra Rauschert | | a | | Coccochondra Rauschert | | Rubiaceae |
| Codaria Kuntze | Lerchea L. | | | Codaria Kuntze | Lerchea L. | Rubiaceae |
| Coddia Verdc. | | a | | Coddia Verdc. | | Rubiaceae |
| Coelopyrena Valeton | | a | | Coelopyrena Valeton | | Rubiaceae |
| Coelospermum Blume | | a | | Coelospermum Blume | | Rubiaceae |
| Cofeanthus A. Chev. | Psilanthus Hook. f. | | | Cofeanthus A. Chev. | Psilanthus Hook. f. | Rubiaceae |
| Coffea L. | | a | | Coffea L. | | Rubiaceae |
| Coffea L. subg. Baracoffea | | a | i | Coffea L. subg. Baracoffea | | Rubiaceae |
| Coffea L. subg. Coffea | | a | i | Coffea L. subg. Coffea | | Rubiaceae |
| Coleactina N. Hallé | | a | | Coleactina N. Hallé | | Rubiaceae |
| Colladonia Spreng. | Palicourea Aubl. | | | Colladonia Spreng. | Palicourea Aubl. | Rubiaceae |
| Colleteria David W. Taylor | Wandersong David W. Taylor | | | Colleteria David W. Taylor | Wandersong David W. Taylor | Rubiaceae |
| Colletoecema E. M. A. Petit | | a | | Colletoecema E. M. A. Petit | | Rubiaceae |
| Commianthus Benth. | Retiniphyllum Humb. & Bonpl. | | | Commianthus Benth. | Retiniphyllum Humb. & Bonpl. | Rubiaceae |
| Commitheca Bremek. | Pauridiantha Hook. f. | | | Commitheca Bremek. | Pauridiantha Hook. f. | Rubiaceae |
| Condalia Ruiz & Pav. | Coccocypselum P. Browne | | | Condalia Ruiz & Pav. | Coccocypselum P. Browne | Rubiaceae |
| Condaminea DC. | | a | | Condaminea DC. | | Rubiaceae |
| Congdonia Müll. Arg. | Declieuxia Kunth | | | Congdonia Müll. Arg. | Declieuxia Kunth | Rubiaceae |
| Conosiphon Poepp. | Sphinctanthus Benth. | | | Conosiphon Poepp. | Sphinctanthus Benth. | Rubiaceae |
| Conostomium (Stapf) Cufod. | | a | | Conostomium (Stapf) Cufod. | | Rubiaceae |
| Conotrichia A. Rich. | Manettia Mutis | | | Conotrichia A. Rich. | Manettia Mutis | Rubiaceae |
| Coprosma J. R. Forst. & G. Forst. | | a | | Coprosma J. R. Forst. & G. Forst. | | Rubiaceae |
| Coptophyllum Korth. | | a | | Coptophyllum Korth. | | Rubiaceae |
| Coptosapelta Korth. | | a | | Coptosapelta Korth. | | Rubiaceae |
| Coptospelta K. Schum., orth. var. | Coptosapelta Korth. | | | Coptospelta K. Schum., orth. var. | Coptosapelta Korth. | Rubiaceae |
| Coptosperma Hook. f. | Tarenna Gaertn. | | | Coptosperma Hook. f. | Tarenna Gaertn. | Rubiaceae |
| Cordiera A. Rich. ex DC. | Alibertia A. Rich. ex DC. | | | Cordiera A. Rich. ex DC. | Alibertia A. Rich. ex DC. | Rubiaceae |
| Cordylostigma Groeninckx & Dessein | | a | | Cordylostigma Groeninckx & Dessein | | Rubiaceae |
| Corynanthe Welw. | | a | | Corynanthe Welw. | | Rubiaceae |
| Corynula Hook. f. | Leptostigma Arn. | | | Corynula Hook. f. | Leptostigma Arn. | Rubiaceae |
| Coryphothamnus Steyerm. | | a | | Coryphothamnus Steyerm. | | Rubiaceae |
| Cosmibuena Ruiz & Pav. | | a | | Cosmibuena Ruiz & Pav. | | Rubiaceae |
| Cosmocalyx Standl. | | a | | Cosmocalyx Standl. | | Rubiaceae |
| Coupoui Aubl. | Duroia L. f. | | | Coupoui Aubl. | Duroia L. f. | Rubiaceae |
| Coupuia Raf., orth. var. | Duroia L. f. | | | Coupuia Raf., orth. var. | Duroia L. f. | Rubiaceae |
| Coupuya Raf., orth. var. | Duroia L. f. | | | Coupuya Raf., orth. var. | Duroia L. f. | Rubiaceae |
| Coursiana Homolle | | a | | Coursiana Homolle | | Rubiaceae |
| Coussarea Aubl. | | a | | Coussarea Aubl. | | Rubiaceae |
| Coutaportla Urb. | | a | | Coutaportla Urb. | | Rubiaceae |
| Coutarea Aubl. | | a | | Coutarea Aubl. | | Rubiaceae |
| Cowiea Wernham | | a | | Cowiea Wernham | | Rubiaceae |
| Craterispermum Benth. | | a | | Craterispermum Benth. | | Rubiaceae |
| Creaghia Scort. | Mussaendopsis Baill. | | | Creaghia Scort. | Mussaendopsis Baill. | Rubiaceae |
| Creatantha Standl. | Isertia Schreb. | | | Creatantha Standl. | Isertia Schreb. | Rubiaceae |
| Cremaspora Benth. | | a | | Cremaspora Benth. | | Rubiaceae |
| Cremocarpon Baill. | | a | | Cremocarpon Baill. | | Rubiaceae |
| Crinita Houtt. | Pavetta L. | | | Crinita Houtt. | Pavetta L. | Rubiaceae |
| Crobylanthe Bremek. | | a | | Crobylanthe Bremek. | | Rubiaceae |
| Crocyllis E. Mey. ex Benth. & Hook. f. | | a | | Crocyllis E. Mey. ex Benth. & Hook. f. | | Rubiaceae |
| Crossopteryx Fenzl | | a | | Crossopteryx Fenzl | | Rubiaceae |
| Crucianella L. | | a | | Crucianella L. | | Rubiaceae |
| Cruciata Mill. | | a | | Cruciata Mill. | | Rubiaceae |
| Cruckshanksia Hook. & Arn. | | a | | Cruckshanksia Hook. & Arn. | | Rubiaceae |
| Crusea Cham. & Schltdl. | | a | | Crusea Cham. & Schltdl. | | Rubiaceae |
| Crusea A. Rich. | Chione DC. | | | Crusea A. Rich. | Chione DC. | Rubiaceae |
| Cryptospermum Young ex Pers. | Opercularia Gaertn. | | | Cryptospermum Young ex Pers. | Opercularia Gaertn. | Rubiaceae |
| Csapodya Borhidi | Deppea Cham. & Schltdl. | | | Csapodya Borhidi | Deppea Cham. & Schltdl. | Rubiaceae |
| Cuatrecasasia Standl. | Arachnothryx Planch. | | | Cuatrecasasia Standl. | Arachnothryx Planch. | Rubiaceae |
| Cuatrecasasiodendron Standl. & Steyerm. | Arachnothryx Planch. | | | Cuatrecasasiodendron Standl. & Steyerm. | Arachnothryx Planch. | Rubiaceae |
| Cubanola Aiello | | a | | Cubanola Aiello | | Rubiaceae |
| Cuncea Buch.-Ham. ex D. Don | Knoxia L. | | | Cuncea Buch.-Ham. ex D. Don | Knoxia L. | Rubiaceae |
| Cunina Gay | Nertera Banks ex Gaertn. | | | Cunina Gay | Nertera Banks ex Gaertn. | Rubiaceae |
| Cunninghamia Schreb. | Malanea Aubl. | | | Cunninghamia Schreb. | Malanea Aubl. | Rubiaceae |
| Cupi Adans. | Tarenna Gaertn. | | | Cupi Adans. | Tarenna Gaertn. | Rubiaceae |
| Cupia (Schult.) DC. | Anomanthodia Hook. f. | | | Cupia (Schult.) DC. | Anomanthodia Hook. f. | Rubiaceae |
| Cupirana Miers | Duroia L. f. | | | Cupirana Miers | Duroia L. f. | Rubiaceae |
| Cupuia Raf. | Duroia L. f. | | | Cupuia Raf. | Duroia L. f. | Rubiaceae |
| Cuviera DC. | | a | | Cuviera DC. | | Rubiaceae |
| Cyclophyllum Hook. f. | | a | | Cyclophyllum Hook. f. | | Rubiaceae |
| Cymelonema C. Presl | Urophyllum Wall. | | | Cymelonema C. Presl | Urophyllum Wall. | Rubiaceae |
| Cynanchica Fourr. | Asperula L. | | | Cynanchica Fourr. | Asperula L. | Rubiaceae |
| Cynocrambe Gagnebin | Theligonum L. | | | Cynocrambe Gagnebin | Theligonum L. | Rubiaceae |
| Cyrtanthus Schreb. | Posoqueria Aubl. | | | Cyrtanthus Schreb. | Posoqueria Aubl. | Rubiaceae |
| Damnacanthus C. F. Gaertn. | | a | | Damnacanthus C. F. Gaertn. | | Rubiaceae |
| Danais Comm. ex Vent. | | a | | Danais Comm. ex Vent. | | Rubiaceae |
| Dasus Lour. | Lasianthus Jack | | | Dasus Lour. | Lasianthus Jack | Rubiaceae |
| Dasycephala (DC.) Hook. f. | Diodia Gronov. | | | Dasycephala (DC.) Hook. f. | Diodia Gronov. | Rubiaceae |
| Dasys Lem. | Lasianthus Jack | | | Dasys Lem. | Lasianthus Jack | Rubiaceae |
| Daun-Contu Adans. | Paederia L. | | | Daun-Contu Adans. | Paederia L. | Rubiaceae |
| Debia Neupane & N. Wikstr. | | a | | Debia Neupane & N. Wikstr. | | Rubiaceae |
| Decameria Welw. | Gardenia J. Ellis | | | Decameria Welw. | Gardenia J. Ellis | Rubiaceae |
| Decapenta Raf. | Diodia Gronov. | | | Decapenta Raf. | Diodia Gronov. | Rubiaceae |
| Deccania Tirveng. | | a | | Deccania Tirveng. | | Rubiaceae |
| Declieuxia Kunth | | a | | Declieuxia Kunth | | Rubiaceae |
| Delpechia Montrouz. | Psychotria L. | | | Delpechia Montrouz. | Psychotria L. | Rubiaceae |
| Democritea DC. | Serissa Comm. ex Juss. | | | Democritea DC. | Serissa Comm. ex Juss. | Rubiaceae |
| Dendrosipanea Ducke | | a | | Dendrosipanea Ducke | | Rubiaceae |
| Denscantia E. L. Cabral & Bacigalupo | | a | | Denscantia E. L. Cabral & Bacigalupo | | Rubiaceae |
| Dentella J. R. Forst. & G. Forst. | | a | | Dentella J. R. Forst. & G. Forst. | | Rubiaceae |
| Dentillaria Kuntze | Knoxia L. | | | Dentillaria Kuntze | Knoxia L. | Rubiaceae |
| Deppea Cham. & Schltdl. | | a | | Deppea Cham. & Schltdl. | | Rubiaceae |
| Diacrodon Sprague | | a | | Diacrodon Sprague | | Rubiaceae |
| Dialypetalanthus Kuhlm. | | a | | Dialypetalanthus Kuhlm. | | Rubiaceae |
| Dibrachionostylus Bremek. | | a | | Dibrachionostylus Bremek. | | Rubiaceae |
| Dicrobotryum Willd. | Guettarda L. | | | Dicrobotryum Willd. | Guettarda L. | Rubiaceae |
| Dictyandra Welw. ex Benth. & Hook. f. | | a | | Dictyandra Welw. ex Benth. & Hook. f. | | Rubiaceae |
| Dictyospora Hook. f. | Hedyotis L. | | | Dictyospora Hook. f. | Hedyotis L. | Rubiaceae |
| Didymaea Hook. f. | | a | | Didymaea Hook. f. | | Rubiaceae |
| Didymoecium Bremek. | Rennellia Korth. | | | Didymoecium Bremek. | Rennellia Korth. | Rubiaceae |
| Didymochlamys Hook. f. | | a | | Didymochlamys Hook. f. | | Rubiaceae |
| Didymopogon Bremek. | | a | | Didymopogon Bremek. | | Rubiaceae |
| Didymosalpinx Keay | | a | | Didymosalpinx Keay | | Rubiaceae |
| Dichilanthe Thwaites | | a | | Dichilanthe Thwaites | | Rubiaceae |
| Dichrospermum Bremek. | Spermacoce L. | | | Dichrospermum Bremek. | Spermacoce L. | Rubiaceae |
| Dillenia Heist. ex Fabr. | Sherardia L. | | | Dillenia Heist. ex Fabr. | Sherardia L. | Rubiaceae |
| Dimetia (Wight & Arn.) Meisn. | | a | | Dimetia (Wight & Arn.) Meisn. | | Rubiaceae |
| Dinocanthium Bremek. | Pyrostria Comm. ex Juss. | | | Dinocanthium Bremek. | Pyrostria Comm. ex Juss. | Rubiaceae |
| Diodella Small | Hexasepalum Bartl. ex DC. | | | Diodella Small | Hexasepalum Bartl. ex DC. | Rubiaceae |
| Diodia Gronov. | | a | | Diodia Gronov. | | Rubiaceae |
| Diodioides Loefl., nom. inval. | Spermacoce L. | | | Diodioides Loefl., nom. inval. | Spermacoce L. | Rubiaceae |
| Diodois Pohl, nom. inval. | Psyllocarpus Mart. & Zucc. | | | Diodois Pohl, nom. inval. | Psyllocarpus Mart. & Zucc. | Rubiaceae |
| Dioecrescis Tirveng. | | a | | Dioecrescis Tirveng. | | Rubiaceae |
| Dioicodendron Steyerm. | | a | | Dioicodendron Steyerm. | | Rubiaceae |
| Dioneiodon Raf. | Diodia Gronov. | | | Dioneiodon Raf. | Diodia Gronov. | Rubiaceae |
| Diotocarpus Hochst. | Pentanisia Harv. | | | Diotocarpus Hochst. | Pentanisia Harv. | Rubiaceae |
| Diotocranus Bremek. | Mitrasacmopsis Jovet | | | Diotocranus Bremek. | Mitrasacmopsis Jovet | Rubiaceae |
| Diphragmus C. Presl | Spermacoce L. | | | Diphragmus C. Presl | Spermacoce L. | Rubiaceae |
| Diplocrater Hook. f. | Tricalysia A. Rich. ex DC. | | | Diplocrater Hook. f. | Tricalysia A. Rich. ex DC. | Rubiaceae |
| Diplophragma (Wight & Arn.) Meisn. | Hedyotis L. | | | Diplophragma (Wight & Arn.) Meisn. | Hedyotis L. | Rubiaceae |
| Diplospora DC. | | a | | Diplospora DC. | | Rubiaceae |
| Diplosporopsis Wernham | Belonophora Hook. f. | | | Diplosporopsis Wernham | Belonophora Hook. f. | Rubiaceae |
| Dirichletia Klotzsch | | a | | Dirichletia Klotzsch | | Rubiaceae |
| Discocoffea A. Chev. | Tricalysia A. Rich. ex DC. | | | Discocoffea A. Chev. | Tricalysia A. Rich. ex DC. | Rubiaceae |
| Discospermum Dalzell | | a | | Discospermum Dalzell | | Rubiaceae |
| Disodea Pers. | Paederia L. | | | Disodea Pers. | Paederia L. | Rubiaceae |
| Disperma J. F. Gmel. | Mitchella L. | | | Disperma J. F. Gmel. | Mitchella L. | Rubiaceae |
| Diyaminauclea Ridsdale | | a | | Diyaminauclea Ridsdale | | Rubiaceae |
| Dolianthus C. H. Wright | | a | | Dolianthus C. H. Wright | | Rubiaceae |
| Dolichanthera Schltr. & K. Krause | Morierina Vieill. | | | Dolichanthera Schltr. & K. Krause | Morierina Vieill. | Rubiaceae |
| Dolichocarpa K. L. Gibbons | | a | | Dolichocarpa K. L. Gibbons | | Rubiaceae |
| Dolichodelphys K. Schum. & K. Krause | | a | | Dolichodelphys K. Schum. & K. Krause | | Rubiaceae |
| Dolicholobium A. Gray | | a | | Dolicholobium A. Gray | | Rubiaceae |
| Dolichometra K. Schum. | | a | | Dolichometra K. Schum. | | Rubiaceae |
| Dolichopentas Kårehed & B. Bremer | | a | | Dolichopentas Kårehed & B. Bremer | | Rubiaceae |
| Dondisia DC. | Canthium Lam. | | | Dondisia DC. | Canthium Lam. | Rubiaceae |
| Donkelaaria Lem. | Guettarda L. | | | Donkelaaria Lem. | Guettarda L. | Rubiaceae |
| Donnellyanthus Borhidi | | a | | Donnellyanthus Borhidi | | Rubiaceae |
| Doricera Verdc. | | a | | Doricera Verdc. | | Rubiaceae |
| Dorisia Gillespie | Mastixiodendron Melch. | | | Dorisia Gillespie | Mastixiodendron Melch. | Rubiaceae |
| Dorothea Wernham | Aulacocalyx Hook. f. | | | Dorothea Wernham | Aulacocalyx Hook. f. | Rubiaceae |
| Douarrea Montrouz. | Psychotria L. | | | Douarrea Montrouz. | Psychotria L. | Rubiaceae |
| Dressleriopsis Dwyer | Lasianthus Jack | | | Dressleriopsis Dwyer | Lasianthus Jack | Rubiaceae |
| Duggena Vahl, nom. inval. | Gonzalagunia Ruiz & Pav. | | | Duggena Vahl, nom. inval. | Gonzalagunia Ruiz & Pav. | Rubiaceae |
| Duhamelia Pers. | Hamelia Jacq. | | | Duhamelia Pers. | Hamelia Jacq. | Rubiaceae |
| Duidania Standl. | | a | | Duidania Standl. | | Rubiaceae |
| Dukea Dwyer | Raritebe Wernham | | | Dukea Dwyer | Raritebe Wernham | Rubiaceae |
| Dunalia Spreng. | Lucya DC. | | | Dunalia Spreng. | Lucya DC. | Rubiaceae |
| Dunnia Tutcher | | a | | Dunnia Tutcher | | Rubiaceae |
| Duperrea Pierre ex Pit. | | a | | Duperrea Pierre ex Pit. | | Rubiaceae |
| Duroia L. f. | | a | | Duroia L. f. | | Rubiaceae |
| Durringtonia R. J. F. Hend. & Guymer | | a | | Durringtonia R. J. F. Hend. & Guymer | | Rubiaceae |
| Duvaucellia Bowdich | Kohautia Cham. & Schltdl. | | | Duvaucellia Bowdich | Kohautia Cham. & Schltdl. | Rubiaceae |
| Dyctiospora Reinw. ex Korth. | Hedyotis L. | | | Dyctiospora Reinw. ex Korth. | Hedyotis L. | Rubiaceae |
| Dychotria Raf. | Psychotria L. | | | Dychotria Raf. | Psychotria L. | Rubiaceae |
| Dysoda Lour. | Serissa Comm. ex Juss. | | | Dysoda Lour. | Serissa Comm. ex Juss. | Rubiaceae |
| Dysodidendron Gardner | Saprosma Blume | | | Dysodidendron Gardner | Saprosma Blume | Rubiaceae |
| Dysosmia Miq. | Saprosma Blume | | | Dysosmia Miq. | Saprosma Blume | Rubiaceae |
| Ebelia Rchb. | Diodia Gronov. | | | Ebelia Rchb. | Diodia Gronov. | Rubiaceae |
| Ecpoma K. Schum. | | a | | Ecpoma K. Schum. | | Rubiaceae |
| Edechia Loefl. | Guettarda L. | | | Edechia Loefl. | Guettarda L. | Rubiaceae |
| Edithea Standl. | Omiltemia Standl. | | | Edithea Standl. | Omiltemia Standl. | Rubiaceae |
| Edrastima Raf. | | a | | Edrastima Raf. | | Rubiaceae |
| Ehrenbergia Spreng. | Amaioua Aubl. | | | Ehrenbergia Spreng. | Amaioua Aubl. | Rubiaceae |
| Echinodendrum A. Rich. | Scolosanthus Vahl | | | Echinodendrum A. Rich. | Scolosanthus Vahl | Rubiaceae |
| Einsteinia Ducke | Kutchubaea Fisch. ex DC. | | | Einsteinia Ducke | Kutchubaea Fisch. ex DC. | Rubiaceae |
| Eionitis Bremek. | Oldenlandia L. | | | Eionitis Bremek. | Oldenlandia L. | Rubiaceae |
| Eizia Standl. | | a | | Eizia Standl. | | Rubiaceae |
| Elaeagia Wedd. | | a | | Elaeagia Wedd. | | Rubiaceae |
| Elattospermum Soler. | Breonia A. Rich. ex DC. | | | Elattospermum Soler. | Breonia A. Rich. ex DC. | Rubiaceae |
| Eleutheranthus K. Schum., orth. var. | Opercularia Gaertn. | | | Eleutheranthus K. Schum., orth. var. | Opercularia Gaertn. | Rubiaceae |
| Eleuthranthes F. Muell. ex Benth. | Opercularia Gaertn. | | | Eleuthranthes F. Muell. ex Benth. | Opercularia Gaertn. | Rubiaceae |
| Emmenopterys Oliv. | | a | | Emmenopterys Oliv. | | Rubiaceae |
| Emmenopteryx Dalla Torre & Harms, orth. var. | Emmenopterys Oliv. | | | Emmenopteryx Dalla Torre & Harms, orth. var. | Emmenopterys Oliv. | Rubiaceae |
| Emmeorhiza Pohl ex Endl. | | a | | Emmeorhiza Pohl ex Endl. | | Rubiaceae |
| Empogona Hook. f. | | a | | Empogona Hook. f. | | Rubiaceae |
| Encopea C. Presl | Faramea Aubl. | | | Encopea C. Presl | Faramea Aubl. | Rubiaceae |
| Endlichera C. Presl | Emmeorhiza Pohl ex Endl. | | | Endlichera C. Presl | Emmeorhiza Pohl ex Endl. | Rubiaceae |
| Endolasia Turcz. | Manettia Mutis | | | Endolasia Turcz. | Manettia Mutis | Rubiaceae |
| Endolithodes Bartl., nom. inval. | Retiniphyllum Humb. & Bonpl. | | | Endolithodes Bartl., nom. inval. | Retiniphyllum Humb. & Bonpl. | Rubiaceae |
| Endopogon Raf. | Diodia Gronov. | | | Endopogon Raf. | Diodia Gronov. | Rubiaceae |
| Enkylista Hook. f., orth. var. | Calycophyllum DC. | | | Enkylista Hook. f., orth. var. | Calycophyllum DC. | Rubiaceae |
| Enterospermum Hiern | Tarenna Gaertn. | | | Enterospermum Hiern | Tarenna Gaertn. | Rubiaceae |
| Eosanthe Urb. | | a | | Eosanthe Urb. | | Rubiaceae |
| Epidendroides Sol. | Myrmecodia Jack | | | Epidendroides Sol. | Myrmecodia Jack | Rubiaceae |
| Epitaberna K. Schum. | Heinsia DC. | | | Epitaberna K. Schum. | Heinsia DC. | Rubiaceae |
| Epithinia Jack | Scyphiphora C. F. Gaertn. | | | Epithinia Jack | Scyphiphora C. F. Gaertn. | Rubiaceae |
| Ereicoctis (DC.) Kuntze | Arcytophyllum Willd. ex Schult. & Schult. f. | | | Ereicoctis (DC.) Kuntze | Arcytophyllum Willd. ex Schult. & Schult. f. | Rubiaceae |
| Eresimus Raf. | Cephalanthus L. | | | Eresimus Raf. | Cephalanthus L. | Rubiaceae |
| Eriosemopsis Robyns | | a | | Eriosemopsis Robyns | | Rubiaceae |
| Eriostoma Boivin ex Baill., nom. inval. | Tricalysia A. Rich. ex DC. | | | Eriostoma Boivin ex Baill., nom. inval. | Tricalysia A. Rich. ex DC. | Rubiaceae |
| Erithalis P. Browne | | a | | Erithalis P. Browne | | Rubiaceae |
| Erithalis G. Forst. | Timonius DC. | | | Erithalis G. Forst. | Timonius DC. | Rubiaceae |
| Ernestimeyera Kuntze | Alberta E. Mey. | | | Ernestimeyera Kuntze | Alberta E. Mey. | Rubiaceae |
| Ernodea Sw. | | a | | Ernodea Sw. | | Rubiaceae |
| Erosmia A. Juss. | Hoffmannia Sw. | | | Erosmia A. Juss. | Hoffmannia Sw. | Rubiaceae |
| Erythrodanum Thouars | Nertera Banks ex Gaertn. | | | Erythrodanum Thouars | Nertera Banks ex Gaertn. | Rubiaceae |
| Etericius Desv. ex Ham., nom. dub. | | a | | Etericius Desv. ex Ham., nom. dub. | | Rubiaceae |
| Euarthronia Nutt. ex A. Gray, nom. inval. | Coprosma J. R. Forst. & G. Forst. | | | Euarthronia Nutt. ex A. Gray, nom. inval. | Coprosma J. R. Forst. & G. Forst. | Rubiaceae |
| Euclinia Salisb. | | a | | Euclinia Salisb. | | Rubiaceae |
| Eukylista Benth. | Calycophyllum DC. | | | Eukylista Benth. | Calycophyllum DC. | Rubiaceae |
| Eumachia DC. | | a | | Eumachia DC. | | Rubiaceae |
| Eumorphanthus A. C. Sm. | Psychotria L. | | | Eumorphanthus A. C. Sm. | Psychotria L. | Rubiaceae |
| Euosmia Kunth | Hoffmannia Sw. | | | Euosmia Kunth | Hoffmannia Sw. | Rubiaceae |
| Eupyrena Wight & Arn. | Timonius DC. | | | Eupyrena Wight & Arn. | Timonius DC. | Rubiaceae |
| Eurhotia Neck., nom. inval. | Psychotria L. | | | Eurhotia Neck., nom. inval. | Psychotria L. | Rubiaceae |
| Eurynome DC. | Coprosma J. R. Forst. & G. Forst. | | | Eurynome DC. | Coprosma J. R. Forst. & G. Forst. | Rubiaceae |
| Evea Aubl. | Psychotria L. | | | Evea Aubl. | Psychotria L. | Rubiaceae |
| Everistia S. T. Reynolds & R. J. F. Hend. | | a | | Everistia S. T. Reynolds & R. J. F. Hend. | | Rubiaceae |
| Evosmia Humb. & Bonpl. | Hoffmannia Sw. | | | Evosmia Humb. & Bonpl. | Hoffmannia Sw. | Rubiaceae |
| Exallage Bremek. | | a | | Exallage Bremek. | | Rubiaceae |
| Exandra Standl. | Simira Aubl. | | | Exandra Standl. | Simira Aubl. | Rubiaceae |
| Exechostylus K. Schum. | Pavetta L. | | | Exechostylus K. Schum. | Pavetta L. | Rubiaceae |
| Exostema (Pers.) Humb. & Bonpl. | | a | | Exostema (Pers.) Humb. & Bonpl. | | Rubiaceae |
| Exostemma DC., orth. var. | Exostema (Pers.) Humb. & Bonpl. | | | Exostemma DC., orth. var. | Exostema (Pers.) Humb. & Bonpl. | Rubiaceae |
| Exostemon Post & Kuntze, orth. var. | Exostema (Pers.) Humb. & Bonpl. | | | Exostemon Post & Kuntze, orth. var. | Exostema (Pers.) Humb. & Bonpl. | Rubiaceae |
| Fadogia Schweinf. | | a | | Fadogia Schweinf. | | Rubiaceae |
| Fadogiella Robyns | Fadogia Schweinf. | | | Fadogiella Robyns | Fadogia Schweinf. | Rubiaceae |
| Fagerlindia Tirveng. | Benkara Adans. | | | Fagerlindia Tirveng. | Benkara Adans. | Rubiaceae |
| Famarea Vitman, orth. var. | Faramea Aubl. | | | Famarea Vitman, orth. var. | Faramea Aubl. | Rubiaceae |
| Faramea Aubl. | | a | | Faramea Aubl. | | Rubiaceae |
| Ferdinandea Pohl | Ferdinandusa Pohl | | | Ferdinandea Pohl | Ferdinandusa Pohl | Rubiaceae |
| Ferdinandusa Pohl | | a | | Ferdinandusa Pohl | | Rubiaceae |
| Fereiria Vell. ex Vand. | Hillia Jacq. | | | Fereiria Vell. ex Vand. | Hillia Jacq. | Rubiaceae |
| Feretia Delile | | a | | Feretia Delile | | Rubiaceae |
| Fergusonia Hook. f. | | a | | Fergusonia Hook. f. | | Rubiaceae |
| Fernelia Comm. ex Lam. | | a | | Fernelia Comm. ex Lam. | | Rubiaceae |
| Figuierea Montrouz. | Coelospermum Blume | | | Figuierea Montrouz. | Coelospermum Blume | Rubiaceae |
| Flagenium Baill. | | a | | Flagenium Baill. | | Rubiaceae |
| Flemingia W. Hunter ex Ridl. | Tarenna Gaertn. | | | Flemingia W. Hunter ex Ridl. | Tarenna Gaertn. | Rubiaceae |
| Fleroya Y. F. Deng | | a | | Fleroya Y. F. Deng | | Rubiaceae |
| Flexanthera Rusby | | a | | Flexanthera Rusby | | Rubiaceae |
| Foscarenia Vell. ex Vand. | Randia L. | | | Foscarenia Vell. ex Vand. | Randia L. | Rubiaceae |
| Franciella Guillaumin | Neofranciella Guillaumin | | | Franciella Guillaumin | Neofranciella Guillaumin | Rubiaceae |
| Franchetia Baill. | Breonia A. Rich. ex DC. | | | Franchetia Baill. | Breonia A. Rich. ex DC. | Rubiaceae |
| Froehlichia D. Dietr., orth. var. | Coussarea Aubl. | | | Froehlichia D. Dietr., orth. var. | Coussarea Aubl. | Rubiaceae |
| Froelichia Vahl | Coussarea Aubl. | | | Froelichia Vahl | Coussarea Aubl. | Rubiaceae |
| Fructesca DC. ex Meisn. | Gaertnera Lam. | | | Fructesca DC. ex Meisn. | Gaertnera Lam. | Rubiaceae |
| Fuchsia Sw. | Schradera Vahl | | | Fuchsia Sw. | Schradera Vahl | Rubiaceae |
| Furcatella Baum.-Bod., nom. inval. | Psychotria L. | | | Furcatella Baum.-Bod., nom. inval. | Psychotria L. | Rubiaceae |
| Gaertnera Lam. | | a | | Gaertnera Lam. | | Rubiaceae |
| Gaillionia Endl., orth. var. | Gaillonia A. Rich. ex DC. | | | Gaillionia Endl., orth. var. | Gaillonia A. Rich. ex DC. | Rubiaceae |
| Gaillonia A. Rich. ex DC. | | a | | Gaillonia A. Rich. ex DC. | | Rubiaceae |
| Galianthe Griseb. | Spermacoce L. | | | Galianthe Griseb. | Spermacoce L. | Rubiaceae |
| Galiniera Delile | | a | | Galiniera Delile | | Rubiaceae |
| Galium L. | | a | | Galium L. | | Rubiaceae |
| Gallienia Dubard & Dop | | a | | Gallienia Dubard & Dop | | Rubiaceae |
| Gallion Pohl, orth. var. | Galium L. | | | Gallion Pohl, orth. var. | Galium L. | Rubiaceae |
| Gallium Mill., orth. var. | Galium L. | | | Gallium Mill., orth. var. | Galium L. | Rubiaceae |
| Galopina Thunb. | | a | | Galopina Thunb. | | Rubiaceae |
| Galvania Vand. | Psychotria L. | | | Galvania Vand. | Psychotria L. | Rubiaceae |
| Gamotopea Bremek. | | a | | Gamotopea Bremek. | | Rubiaceae |
| Ganguebina Vell., orth. var. | Manettia Mutis | | | Ganguebina Vell., orth. var. | Manettia Mutis | Rubiaceae |
| Garapatica H. Karst. | Alibertia A. Rich. ex DC. | | | Garapatica H. Karst. | Alibertia A. Rich. ex DC. | Rubiaceae |
| Gardena Adans., orth. var. | Gardenia J. Ellis | | | Gardena Adans., orth. var. | Gardenia J. Ellis | Rubiaceae |
| Gardenia J. Ellis | | a | | Gardenia J. Ellis | | Rubiaceae |
| Gardeniola Cham. | Alibertia A. Rich. ex DC. | | | Gardeniola Cham. | Alibertia A. Rich. ex DC. | Rubiaceae |
| Gardeniopsis Miq. | | a | | Gardeniopsis Miq. | | Rubiaceae |
| Genipa L. | | a | | Genipa L. | | Rubiaceae |
| Genipella A. Rich. ex DC., nom. inval. | Alibertia A. Rich. ex DC. | | | Genipella A. Rich. ex DC., nom. inval. | Alibertia A. Rich. ex DC. | Rubiaceae |
| Gentingia J. T. Johanss. & K. M. Wong | Rennellia Korth. | | | Gentingia J. T. Johanss. & K. M. Wong | Rennellia Korth. | Rubiaceae |
| Geocardia Standl. | Geophila D. Don | | | Geocardia Standl. | Geophila D. Don | Rubiaceae |
| Geoherpum Willd. ex Schult. & Schult. f. | Mitchella L. | | | Geoherpum Willd. ex Schult. & Schult. f. | Mitchella L. | Rubiaceae |
| Geophila D. Don | | a | | Geophila D. Don | | Rubiaceae |
| Gerontogea Cham. & Schltdl. | Oldenlandia L. | | | Gerontogea Cham. & Schltdl. | Oldenlandia L. | Rubiaceae |
| Gillespiea A. C. Sm. | | a | | Gillespiea A. C. Sm. | | Rubiaceae |
| Gleasonia Standl. | | a | | Gleasonia Standl. | | Rubiaceae |
| Glionnetia Tirveng. | | a | | Glionnetia Tirveng. | | Rubiaceae |
| Globulostylis Wernham | Cuviera DC. | | | Globulostylis Wernham | Cuviera DC. | Rubiaceae |
| Gloneria André | Psychotria L. | | | Gloneria André | Psychotria L. | Rubiaceae |
| Glossostipula Lorence | | a | | Glossostipula Lorence | | Rubiaceae |
| Gomezia Mutis, orth. var. | Nertera Banks ex Gaertn. | | | Gomezia Mutis, orth. var. | Nertera Banks ex Gaertn. | Rubiaceae |
| Gomosia Lam., orth. var. | Nertera Banks ex Gaertn. | | | Gomosia Lam., orth. var. | Nertera Banks ex Gaertn. | Rubiaceae |
| Gomoza Cothen., orth. var. | Nertera Banks ex Gaertn. | | | Gomoza Cothen., orth. var. | Nertera Banks ex Gaertn. | Rubiaceae |
| Gomozia Mutis ex L. f. | Nertera Banks ex Gaertn. | | | Gomozia Mutis ex L. f. | Nertera Banks ex Gaertn. | Rubiaceae |
| Gomphocalyx Baker | | a | | Gomphocalyx Baker | | Rubiaceae |
| Gomphosia Wedd. | Ferdinandusa Pohl | | | Gomphosia Wedd. | Ferdinandusa Pohl | Rubiaceae |
| Gonianthes A. Rich. | Cubanola Aiello | | | Gonianthes A. Rich. | Cubanola Aiello | Rubiaceae |
| Gonotheca Blume ex DC. | Oldenlandia L. | | | Gonotheca Blume ex DC. | Oldenlandia L. | Rubiaceae |
| Gonyanera Korth. | Acranthera Arn. ex Meisn. | | | Gonyanera Korth. | Acranthera Arn. ex Meisn. | Rubiaceae |
| Gonzalagunia Ruiz & Pav. | | a | | Gonzalagunia Ruiz & Pav. | | Rubiaceae |
| Gonzalea Pers. | Gonzalagunia Ruiz & Pav. | | | Gonzalea Pers. | Gonzalagunia Ruiz & Pav. | Rubiaceae |
| Gouldia A. Gray | Kadua Cham. & Schltdl. | | | Gouldia A. Gray | Kadua Cham. & Schltdl. | Rubiaceae |
| Greenea Wight & Arn. | | a | | Greenea Wight & Arn. | | Rubiaceae |
| Greeniopsis Merr. | | a | | Greeniopsis Merr. | | Rubiaceae |
| Griffithia Wight & Arn. | Benkara Adans. | | | Griffithia Wight & Arn. | Benkara Adans. | Rubiaceae |
| Grisia Brongn. | Bikkia Reinw. | | | Grisia Brongn. | Bikkia Reinw. | Rubiaceae |
| Grulhmannia Neck. ex Raf. | Spermacoce L. | | | Grulhmannia Neck. ex Raf. | Spermacoce L. | Rubiaceae |
| Grumilea Gaertn. | Psychotria L. | | | Grumilea Gaertn. | Psychotria L. | Rubiaceae |
| Grundlea Steud., orth. var. | Psychotria L. | | | Grundlea Steud., orth. var. | Psychotria L. | Rubiaceae |
| Grunilea Poir., orth. var. | Psychotria L. | | | Grunilea Poir., orth. var. | Psychotria L. | Rubiaceae |
| Guagnebina Vell. | Manettia Mutis | | | Guagnebina Vell. | Manettia Mutis | Rubiaceae |
| Guettarda L. | | a | | Guettarda L. | | Rubiaceae |
| Guettardella Champ. ex Benth. | Antirhea Comm. ex Juss. | | | Guettardella Champ. ex Benth. | Antirhea Comm. ex Juss. | Rubiaceae |
| Gutenbergia Walp., orth. var. | Morinda L. | | | Gutenbergia Walp., orth. var. | Morinda L. | Rubiaceae |
| Guttenbergia Zoll. & Moritzi | Gynochthodes Blume | | | Guttenbergia Zoll. & Moritzi | Gynochthodes Blume | Rubiaceae |
| Gynaecopachys Hassk., orth. var. | Randia L. | | | Gynaecopachys Hassk., orth. var. | Randia L. | Rubiaceae |
| Gynochthodes Blume | | a | | Gynochthodes Blume | | Rubiaceae |
| Gynochtodes Blume, orth. var. | Gynochthodes Blume | | | Gynochtodes Blume, orth. var. | Gynochthodes Blume | Rubiaceae |
| Gynopachis Blume | | a | | Gynopachis Blume | | Rubiaceae |
| Gyrostipula J.-F. Leroy | | a | | Gyrostipula J.-F. Leroy | | Rubiaceae |
| Habroneuron Standl. | | a | | Habroneuron Standl. | | Rubiaceae |
| Habsia Steud. | Guettarda L. | | | Habsia Steud. | Guettarda L. | Rubiaceae |
| Haldina Ridsdale | | a | | Haldina Ridsdale | | Rubiaceae |
| Halesia P. Browne | Guettarda L. | | | Halesia P. Browne | Guettarda L. | Rubiaceae |
| Hallea J.-F. Leroy | Fleroya Y. F. Deng | | | Hallea J.-F. Leroy | Fleroya Y. F. Deng | Rubiaceae |
| Hamelia Jacq. | | a | | Hamelia Jacq. | | Rubiaceae |
| Hamiltonia Roxb. | Spermadictyon Roxb. | | | Hamiltonia Roxb. | Spermadictyon Roxb. | Rubiaceae |
| Hayataella Masam. | | a | | Hayataella Masam. | | Rubiaceae |
| Hecistocarpus Post & Kuntze, orth. var. | Hekistocarpa Hook. f. | | | Hecistocarpus Post & Kuntze, orth. var. | Hekistocarpa Hook. f. | Rubiaceae |
| Hedstromia A. C. Sm. | | a | | Hedstromia A. C. Sm. | | Rubiaceae |
| Hedyotis L. | | a | | Hedyotis L. | | Rubiaceae |
| Hedythyrsus Bremek. | | a | | Hedythyrsus Bremek. | | Rubiaceae |
| Heinsenia K. Schum. | | a | | Heinsenia K. Schum. | | Rubiaceae |
| Heinsia DC. | | a | | Heinsia DC. | | Rubiaceae |
| Hekistocarpa Hook. f. | | a | | Hekistocarpa Hook. f. | | Rubiaceae |
| Heliospora Hook. f., orth. var. | Timonius DC. | | | Heliospora Hook. f., orth. var. | Timonius DC. | Rubiaceae |
| Helospora Jack | Timonius DC. | | | Helospora Jack | Timonius DC. | Rubiaceae |
| Hemidiodia K. Schum. | Diodia Gronov. | | | Hemidiodia K. Schum. | Diodia Gronov. | Rubiaceae |
| Henisia Walp., orth. var. | Heinsia DC. | | | Henisia Walp., orth. var. | Heinsia DC. | Rubiaceae |
| Henlea H. Karst. | Rustia Klotzsch | | | Henlea H. Karst. | Rustia Klotzsch | Rubiaceae |
| Henriquezia Spruce ex Benth. | | a | | Henriquezia Spruce ex Benth. | | Rubiaceae |
| Herrera Adans. | Erithalis P. Browne | | | Herrera Adans. | Erithalis P. Browne | Rubiaceae |
| Heterophyllaea Hook. f. | | a | | Heterophyllaea Hook. f. | | Rubiaceae |
| Hexactina Willd. ex Schltdl. | Amaioua Aubl. | | | Hexactina Willd. ex Schltdl. | Amaioua Aubl. | Rubiaceae |
| Hexasepalum Bartl. ex DC. | | a | | Hexasepalum Bartl. ex DC. | | Rubiaceae |
| Hexepta Raf. | Coffea L. | | | Hexepta Raf. | Coffea L. | Rubiaceae |
| Hexodontocarpus Dulac | Sherardia L. | | | Hexodontocarpus Dulac | Sherardia L. | Rubiaceae |
| Heymia Dennst. | Dentella J. R. Forst. & G. Forst. | | | Heymia Dennst. | Dentella J. R. Forst. & G. Forst. | Rubiaceae |
| Higginsia Pers. | Hoffmannia Sw. | | | Higginsia Pers. | Hoffmannia Sw. | Rubiaceae |
| Hillia Jacq. | | a | | Hillia Jacq. | | Rubiaceae |
| Himalrandia T. Yamaz. | | a | | Himalrandia T. Yamaz. | | Rubiaceae |
| Hindsia Benth. ex Lindl. | | a | | Hindsia Benth. ex Lindl. | | Rubiaceae |
| Hintonia Bullock | | a | | Hintonia Bullock | | Rubiaceae |
| Hippotis Ruiz & Pav. | | a | | Hippotis Ruiz & Pav. | | Rubiaceae |
| Hitoa Nadeaud | | a | | Hitoa Nadeaud | | Rubiaceae |
| Hodgkinsonia F. Muell. | | a | | Hodgkinsonia F. Muell. | | Rubiaceae |
| Hoffmannia Sw. | | a | | Hoffmannia Sw. | | Rubiaceae |
| Holocarpa Baker | Pentanisia Harv. | | | Holocarpa Baker | Pentanisia Harv. | Rubiaceae |
| Holocarya T. Durand, orth. var. | Pentanisia Harv. | | | Holocarya T. Durand, orth. var. | Pentanisia Harv. | Rubiaceae |
| Holostyla Endl., orth. var. | Coelospermum Blume | | | Holostyla Endl., orth. var. | Coelospermum Blume | Rubiaceae |
| Holstianthus Steyerm. | | a | | Holstianthus Steyerm. | | Rubiaceae |
| Holtonia Standl. | Simira Aubl. | | | Holtonia Standl. | Simira Aubl. | Rubiaceae |
| Homaloclados Hook. f. | Faramea Aubl. | | | Homaloclados Hook. f. | Faramea Aubl. | Rubiaceae |
| Homollea Arènes | | a | | Homollea Arènes | | Rubiaceae |
| Homolliella Arènes | | a | | Homolliella Arènes | | Rubiaceae |
| Hondbessen Adans. | Paederia L. | | | Hondbessen Adans. | Paederia L. | Rubiaceae |
| Houstonia Gronov. | | a | | Houstonia Gronov. | | Rubiaceae |
| Howardia Wedd. | Pogonopus Klotzsch | | | Howardia Wedd. | Pogonopus Klotzsch | Rubiaceae |
| Hutchinsonia Robyns | | a | | Hutchinsonia Robyns | | Rubiaceae |
| Hydnophytum Jack | | a | | Hydnophytum Jack | | Rubiaceae |
| Hydrophylax L. f. | | a | | Hydrophylax L. f. | | Rubiaceae |
| Hymendocarpum Pierre ex Pit. | Nostolachma T. Durand | | | Hymendocarpum Pierre ex Pit. | Nostolachma T. Durand | Rubiaceae |
| Hymenocnemis Hook. f. | | a | | Hymenocnemis Hook. f. | | Rubiaceae |
| Hymenocoleus Robbr. | | a | | Hymenocoleus Robbr. | | Rubiaceae |
| Hymenodictyon Wall. | | a | | Hymenodictyon Wall. | | Rubiaceae |
| Hymenopogon Wall. | Neohymenopogon Bennet | | | Hymenopogon Wall. | Neohymenopogon Bennet | Rubiaceae |
| Hyperacanthus E. Mey. ex Bridson | | a | | Hyperacanthus E. Mey. ex Bridson | | Rubiaceae |
| Hypobathrum Blume | | a | | Hypobathrum Blume | | Rubiaceae |
| Hyptianthera Wight & Arn. | | a | | Hyptianthera Wight & Arn. | | Rubiaceae |
| Chaenocarpus Juss. | Spermacoce L. | | | Chaenocarpus Juss. | Spermacoce L. | Rubiaceae |
| Chaetostachydium Airy Shaw | | a | | Chaetostachydium Airy Shaw | | Rubiaceae |
| Chaetostachys Valeton | Chaetostachydium Airy Shaw | | | Chaetostachys Valeton | Chaetostachydium Airy Shaw | Rubiaceae |
| Chalazocarpus Hiern | Schumanniophyton Harms | | | Chalazocarpus Hiern | Schumanniophyton Harms | Rubiaceae |
| Chalepophyllum Hook. f. | | a | | Chalepophyllum Hook. f. | | Rubiaceae |
| Chamaedaphne Mitch. | Mitchella L. | | | Chamaedaphne Mitch. | Mitchella L. | Rubiaceae |
| Chamaepentas Bremek. | | a | | Chamaepentas Bremek. | | Rubiaceae |
| Chamisme Raf. | Houstonia Gronov. | | | Chamisme Raf. | Houstonia Gronov. | Rubiaceae |
| Chapelieria A. Rich. ex DC. | | a | | Chapelieria A. Rich. ex DC. | | Rubiaceae |
| Charpentiera Vieill. | Ixora L. | | | Charpentiera Vieill. | Ixora L. | Rubiaceae |
| Chassalia Comm. ex Poir. | | a | | Chassalia Comm. ex Poir. | | Rubiaceae |
| Chazaliella E. M. A. Petit & Verdc. | | a | | Chazaliella E. M. A. Petit & Verdc. | | Rubiaceae |
| Chesnea Scop. | Psychotria L. | | | Chesnea Scop. | Psychotria L. | Rubiaceae |
| Chimarrhis Jacq. | | a | | Chimarrhis Jacq. | | Rubiaceae |
| Chiococca P. Browne | | a | | Chiococca P. Browne | | Rubiaceae |
| Chione DC. | | a | | Chione DC. | | Rubiaceae |
| Chlorochorion Puff & Robbr. | Pentanisia Harv. | | | Chlorochorion Puff & Robbr. | Pentanisia Harv. | Rubiaceae |
| Chlorostemma (Lange) Fourr. | Asperula L. | | | Chlorostemma (Lange) Fourr. | Asperula L. | Rubiaceae |
| Chomelia Jacq. | | a | | Chomelia Jacq. | | Rubiaceae |
| Chondrococcus Steyerm. | Coccochondra Rauschert | | | Chondrococcus Steyerm. | Coccochondra Rauschert | Rubiaceae |
| Choristes Benth. | Deppea Cham. & Schltdl. | | | Choristes Benth. | Deppea Cham. & Schltdl. | Rubiaceae |
| Choulettia Pomel | | a | | Choulettia Pomel | | Rubiaceae |
| Chrysoxylon Wedd. | Pogonopus Klotzsch | | | Chrysoxylon Wedd. | Pogonopus Klotzsch | Rubiaceae |
| Chytropsia Bremek. | | a | | Chytropsia Bremek. | | Rubiaceae |
| Ibetralia Bremek. | | a | | Ibetralia Bremek. | | Rubiaceae |
| Imantina Hook. f. | Gynochthodes Blume | | | Imantina Hook. f. | Gynochthodes Blume | Rubiaceae |
| Indopolysolenia Bennet | | a | | Indopolysolenia Bennet | | Rubiaceae |
| Involucrella (Benth. & Hook. f.) Neupane & N. Wikstr. | | a | | Involucrella (Benth. & Hook. f.) Neupane & N. Wikstr. | | Rubiaceae |
| Ipecacuanha Arruda | Psychotria L. | | | Ipecacuanha Arruda | Psychotria L. | Rubiaceae |
| Isartia Dumort., orth. var. | Isertia Schreb. | | | Isartia Dumort., orth. var. | Isertia Schreb. | Rubiaceae |
| Isertia Schreb. | | a | | Isertia Schreb. | | Rubiaceae |
| Isertia Schreb. sect. Cassupa | | a | i | Isertia Schreb. sect. Cassupa | | Rubiaceae |
| Isertia Schreb. sect. Isertia | | a | i | Isertia Schreb. sect. Isertia | | Rubiaceae |
| Isidorea A. Rich. ex DC. | | a | | Isidorea A. Rich. ex DC. | | Rubiaceae |
| Ixora L. | | a | | Ixora L. | | Rubiaceae |
| Jackia Wall. | Jackiopsis Ridsdale | | | Jackia Wall. | Jackiopsis Ridsdale | Rubiaceae |
| Jackiopsis Ridsdale | | a | | Jackiopsis Ridsdale | | Rubiaceae |
| Jainia N. P. Balakr. | Coptophyllum Korth. | | | Jainia N. P. Balakr. | Coptophyllum Korth. | Rubiaceae |
| Jangaraca Raf. | Hamelia Jacq. | | | Jangaraca Raf. | Hamelia Jacq. | Rubiaceae |
| Janotia J.-F. Leroy | | a | | Janotia J.-F. Leroy | | Rubiaceae |
| Jaubertia Guill. | | a | | Jaubertia Guill. | | Rubiaceae |
| Javorkaea Borhidi & Járai-Koml. | Rondeletia L. | | | Javorkaea Borhidi & Járai-Koml. | Rondeletia L. | Rubiaceae |
| Jocayena Raf., orth. var. | Tocoyena Aubl. | | | Jocayena Raf., orth. var. | Tocoyena Aubl. | Rubiaceae |
| Jontanea Raf. | Coccocypselum P. Browne | | | Jontanea Raf. | Coccocypselum P. Browne | Rubiaceae |
| Joosia H. Karst. | | a | | Joosia H. Karst. | | Rubiaceae |
| Jovetia Guédès | | a | | Jovetia Guédès | | Rubiaceae |
| Jurgensia Raf. | Spermacoce L. | | | Jurgensia Raf. | Spermacoce L. | Rubiaceae |
| Justenia Hiern | Bertiera Aubl. | | | Justenia Hiern | Bertiera Aubl. | Rubiaceae |
| Kadua Cham. & Schltdl. | | a | | Kadua Cham. & Schltdl. | | Rubiaceae |
| Kailarsenia Tirveng. | | a | | Kailarsenia Tirveng. | | Rubiaceae |
| Kajewskiella Merr. & L. M. Perry | | a | | Kajewskiella Merr. & L. M. Perry | | Rubiaceae |
| Karamyschewia Fisch. & C. A. Mey. | Oldenlandia L. | | | Karamyschewia Fisch. & C. A. Mey. | Oldenlandia L. | Rubiaceae |
| Katoutheka Adans. | Wendlandia Bartl. ex DC. | | | Katoutheka Adans. | Wendlandia Bartl. ex DC. | Rubiaceae |
| Keenania Hook. f. | | a | | Keenania Hook. f. | | Rubiaceae |
| Keetia E. Phillips | | a | | Keetia E. Phillips | | Rubiaceae |
| Kelloggia Torr. ex Benth. & Hook. f. | | a | | Kelloggia Torr. ex Benth. & Hook. f. | | Rubiaceae |
| Kerianthera J. H. Kirkbr. | | a | | Kerianthera J. H. Kirkbr. | | Rubiaceae |
| Kerstingia K. Schum. | Belonophora Hook. f. | | | Kerstingia K. Schum. | Belonophora Hook. f. | Rubiaceae |
| Khasiaclunea Ridsdale | | a | | Khasiaclunea Ridsdale | | Rubiaceae |
| Kindia Cheek | | a | | Kindia Cheek | | Rubiaceae |
| Kinkina Adans. | Cinchona L. | | | Kinkina Adans. | Cinchona L. | Rubiaceae |
| Klossia Ridl. | | a | | Klossia Ridl. | | Rubiaceae |
| Knoxia L. | | a | | Knoxia L. | | Rubiaceae |
| Koehneago Kuntze | Hoffmannia Sw. | | | Koehneago Kuntze | Hoffmannia Sw. | Rubiaceae |
| Kohautia Cham. & Schltdl. | | a | | Kohautia Cham. & Schltdl. | | Rubiaceae |
| Kochummenia K. M. Wong | | a | | Kochummenia K. M. Wong | | Rubiaceae |
| Kotchubaea Fisch. ex DC., orth. var. | Kutchubaea Fisch. ex DC. | | | Kotchubaea Fisch. ex DC., orth. var. | Kutchubaea Fisch. ex DC. | Rubiaceae |
| Kotchubaea Hook. f., orth. var. | Kutchubaea Fisch. ex DC. | | | Kotchubaea Hook. f., orth. var. | Kutchubaea Fisch. ex DC. | Rubiaceae |
| Kraussia Harv. | | a | | Kraussia Harv. | | Rubiaceae |
| Kumbaya Endl. ex Steud. | Gardenia J. Ellis | | | Kumbaya Endl. ex Steud. | Gardenia J. Ellis | Rubiaceae |
| Kurria Hochst. ex Steud. | Hymenodictyon Wall. | | | Kurria Hochst. ex Steud. | Hymenodictyon Wall. | Rubiaceae |
| Kutchubaea Fisch. ex DC. | | a | | Kutchubaea Fisch. ex DC. | | Rubiaceae |
| Kyrtanthus J. F. Gmel. | Posoqueria Aubl. | | | Kyrtanthus J. F. Gmel. | Posoqueria Aubl. | Rubiaceae |
| Ladenbergia Klotzsch | | a | | Ladenbergia Klotzsch | | Rubiaceae |
| Lagotis E. Mey. | Carpacoce Sond. | | | Lagotis E. Mey. | Carpacoce Sond. | Rubiaceae |
| Lagynias E. Mey. ex Robyns | Vangueria Juss. | | | Lagynias E. Mey. ex Robyns | Vangueria Juss. | Rubiaceae |
| Lachnastoma Korth. | Nostolachma T. Durand | | | Lachnastoma Korth. | Nostolachma T. Durand | Rubiaceae |
| Lachnosiphonium Hochst. | Catunaregam Wolf | | | Lachnosiphonium Hochst. | Catunaregam Wolf | Rubiaceae |
| Lachnostoma Hassk., orth. var. | Nostolachma T. Durand | | | Lachnostoma Hassk., orth. var. | Nostolachma T. Durand | Rubiaceae |
| Lamprothamnus Hiern | | a | | Lamprothamnus Hiern | | Rubiaceae |
| Landia Comm. ex Juss. | Mussaenda L. | | | Landia Comm. ex Juss. | Mussaenda L. | Rubiaceae |
| Landiopsis Capuron ex Bosser | | a | | Landiopsis Capuron ex Bosser | | Rubiaceae |
| Larsenaikia Tirveng. | Kailarsenia Tirveng. | | | Larsenaikia Tirveng. | Kailarsenia Tirveng. | Rubiaceae |
| Lasianthus Jack | | a | | Lasianthus Jack | | Rubiaceae |
| Lasionema D. Don | Macrocnemum P. Browne | | | Lasionema D. Don | Macrocnemum P. Browne | Rubiaceae |
| Lasiostoma Benth. | Hydnophytum Jack | | | Lasiostoma Benth. | Hydnophytum Jack | Rubiaceae |
| Lathraeocarpa Bremek. | | a | | Lathraeocarpa Bremek. | | Rubiaceae |
| Laugeria L., orth. var. | Guettarda L. | | | Laugeria L., orth. var. | Guettarda L. | Rubiaceae |
| Laugeria Vahl ex Hook. f. | Neolaugeria Nicolson | | | Laugeria Vahl ex Hook. f. | Neolaugeria Nicolson | Rubiaceae |
| Laugieria Jacq. | Guettarda L. | | | Laugieria Jacq. | Guettarda L. | Rubiaceae |
| Lawia Wight | Mycetia Reinw. | | | Lawia Wight | Mycetia Reinw. | Rubiaceae |
| Laxmannia S. G. Gmel. ex Trin. | Phuopsis (Griseb.) Hook. f. | | | Laxmannia S. G. Gmel. ex Trin. | Phuopsis (Griseb.) Hook. f. | Rubiaceae |
| Lecananthus Jack | | a | | Lecananthus Jack | | Rubiaceae |
| Lecanosperma Rusby | | a | | Lecanosperma Rusby | | Rubiaceae |
| Lecariocalyx Bremek. | | a | | Lecariocalyx Bremek. | | Rubiaceae |
| Lecontea A. Rich. ex DC. | Paederia L. | | | Lecontea A. Rich. ex DC. | Paederia L. | Rubiaceae |
| Leiochilus Hook. f. | Coffea L. | | | Leiochilus Hook. f. | Coffea L. | Rubiaceae |
| Lelya Bremek. | | a | | Lelya Bremek. | | Rubiaceae |
| Lemyrea (A. Chev.) A. Chev. & Beille | | a | | Lemyrea (A. Chev.) A. Chev. & Beille | | Rubiaceae |
| Lepidostoma Bremek. | | a | | Lepidostoma Bremek. | | Rubiaceae |
| Lepipogon G. Bertol. | Catunaregam Wolf | | | Lepipogon G. Bertol. | Catunaregam Wolf | Rubiaceae |
| Leptactina Hook. f. | | a | | Leptactina Hook. f. | | Rubiaceae |
| Leptodermis Wall. | | a | | Leptodermis Wall. | | Rubiaceae |
| Leptomischus Drake | | a | | Leptomischus Drake | | Rubiaceae |
| Leptopetalum Hook. & Arn. | | a | | Leptopetalum Hook. & Arn. | | Rubiaceae |
| Leptoscela Hook. f. | | a | | Leptoscela Hook. f. | | Rubiaceae |
| Leptostigma Arn. | | a | | Leptostigma Arn. | | Rubiaceae |
| Leptunis Steven | Asperula L. | | | Leptunis Steven | Asperula L. | Rubiaceae |
| Lerchea L. | | a | | Lerchea L. | | Rubiaceae |
| Leroya Cavaco, orth. var. | Pyrostria Comm. ex Juss. | | | Leroya Cavaco, orth. var. | Pyrostria Comm. ex Juss. | Rubiaceae |
| Leroyia Cavaco | Pyrostria Comm. ex Juss. | | | Leroyia Cavaco | Pyrostria Comm. ex Juss. | Rubiaceae |
| Leucocodon Gardner | | a | | Leucocodon Gardner | | Rubiaceae |
| Leucolophus Bremek. | | a | | Leucolophus Bremek. | | Rubiaceae |
| Lightfootia Schreb. | Rondeletia L. | | | Lightfootia Schreb. | Rondeletia L. | Rubiaceae |
| Limnosipanea Hook. f. | | a | | Limnosipanea Hook. f. | | Rubiaceae |
| Lindenia Benth. | Augusta Pohl | | | Lindenia Benth. | Augusta Pohl | Rubiaceae |
| Lintersemina Humberto Mend. et al. | | a | | Lintersemina Humberto Mend. et al. | | Rubiaceae |
| Lipostoma D. Don | Coccocypselum P. Browne | | | Lipostoma D. Don | Coccocypselum P. Browne | Rubiaceae |
| Lippaya Endl. | Dentella J. R. Forst. & G. Forst. | | | Lippaya Endl. | Dentella J. R. Forst. & G. Forst. | Rubiaceae |
| Listeria Neck. ex Raf. | Oldenlandia L. | | | Listeria Neck. ex Raf. | Oldenlandia L. | Rubiaceae |
| Litosanthes Blume | Lasianthus Jack | | | Litosanthes Blume | Lasianthus Jack | Rubiaceae |
| Lorencea Borhidi | | a | | Lorencea Borhidi | | Rubiaceae |
| Loretoa Standl. | Capirona Spruce | | | Loretoa Standl. | Capirona Spruce | Rubiaceae |
| Lucinaea DC. | | a | | Lucinaea DC. | | Rubiaceae |
| Luculia Sweet | | a | | Luculia Sweet | | Rubiaceae |
| Lucya DC. | | a | | Lucya DC. | | Rubiaceae |
| Ludekia Ridsdale | | a | | Ludekia Ridsdale | | Rubiaceae |
| Lycioserissa Roem. & Schult. | Canthium Lam. | | | Lycioserissa Roem. & Schult. | Canthium Lam. | Rubiaceae |
| Lygistum P. Browne | Manettia Mutis | | | Lygistum P. Browne | Manettia Mutis | Rubiaceae |
| Lygodisodea Ruiz & Pav. | Paederia L. | | | Lygodisodea Ruiz & Pav. | Paederia L. | Rubiaceae |
| Macbrideina Standl. | | a | | Macbrideina Standl. | | Rubiaceae |
| Macrandria (Wight & Arn.) Meisn. | Hedyotis L. | | | Macrandria (Wight & Arn.) Meisn. | Hedyotis L. | Rubiaceae |
| Macrocnemum P. Browne | | a | | Macrocnemum P. Browne | | Rubiaceae |
| Macrosiphon Miq. | Hindsia Benth. ex Lindl. | | | Macrosiphon Miq. | Hindsia Benth. ex Lindl. | Rubiaceae |
| Macrosphyra Hook. f. | | a | | Macrosphyra Hook. f. | | Rubiaceae |
| Maguireocharis Steyerm. | | a | | Maguireocharis Steyerm. | | Rubiaceae |
| Maguireothamnus Steyerm. | | a | | Maguireothamnus Steyerm. | | Rubiaceae |
| Machaonia Humb. & Bonpl. | | a | | Machaonia Humb. & Bonpl. | | Rubiaceae |
| Malanea Aubl. | | a | | Malanea Aubl. | | Rubiaceae |
| Mallostoma H. Karst. | Arcytophyllum Willd. ex Schult. & Schult. f. | | | Mallostoma H. Karst. | Arcytophyllum Willd. ex Schult. & Schult. f. | Rubiaceae |
| Mamboga Blanco | Mitragyna Korth. | | | Mamboga Blanco | Mitragyna Korth. | Rubiaceae |
| Manettia Mutis | | a | | Manettia Mutis | | Rubiaceae |
| Manostachya Bremek. | | a | | Manostachya Bremek. | | Rubiaceae |
| Mantalania Capuron ex J.-F. Leroy | | a | | Mantalania Capuron ex J.-F. Leroy | | Rubiaceae |
| Mapouria Aubl. | Psychotria L. | | | Mapouria Aubl. | Psychotria L. | Rubiaceae |
| Margaris Griseb., nom. inval. | Eumachia DC. | | | Margaris Griseb., nom. inval. | Eumachia DC. | Rubiaceae |
| Margaritopsis C. Wright | Eumachia DC. | | | Margaritopsis C. Wright | Eumachia DC. | Rubiaceae |
| Marquisia A. Rich. ex DC. | Coprosma J. R. Forst. & G. Forst. | | | Marquisia A. Rich. ex DC. | Coprosma J. R. Forst. & G. Forst. | Rubiaceae |
| Martensianthus Borhidi & Lozada-Pérez | | a | | Martensianthus Borhidi & Lozada-Pérez | | Rubiaceae |
| Martha F. Muell. | Posoqueria Aubl. | | | Martha F. Muell. | Posoqueria Aubl. | Rubiaceae |
| Maschalanthe Blume | Urophyllum Wall. | | | Maschalanthe Blume | Urophyllum Wall. | Rubiaceae |
| Maschalocorymbus Bremek. | | a | | Maschalocorymbus Bremek. | | Rubiaceae |
| Maschalodesme Lauterb. & K. Schum. | | a | | Maschalodesme Lauterb. & K. Schum. | | Rubiaceae |
| Massularia (K. Schum.) Hoyle | | a | | Massularia (K. Schum.) Hoyle | | Rubiaceae |
| Mastixiodendron Melch. | | a | | Mastixiodendron Melch. | | Rubiaceae |
| Matthiola L. | Guettarda L. | | | Matthiola L. | Guettarda L. | Rubiaceae |
| Mattuschkaea Schreb. | Perama Aubl. | | | Mattuschkaea Schreb. | Perama Aubl. | Rubiaceae |
| Mattuschkea Batsch, orth. var. | Perama Aubl. | | | Mattuschkea Batsch, orth. var. | Perama Aubl. | Rubiaceae |
| Mazaea Krug & Urb. | | a | | Mazaea Krug & Urb. | | Rubiaceae |
| Megacarpha Hochst. | Oxyanthus DC. | | | Megacarpha Hochst. | Oxyanthus DC. | Rubiaceae |
| Megalopus K. Schum. | Psychotria L. | | | Megalopus K. Schum. | Psychotria L. | Rubiaceae |
| Megaphyllum Spruce ex Baill. | Pentagonia Benth. | | | Megaphyllum Spruce ex Baill. | Pentagonia Benth. | Rubiaceae |
| Meionandra Gauba | Valantia L. | | | Meionandra Gauba | Valantia L. | Rubiaceae |
| Melachone Gilli | Amaracarpus Blume | | | Melachone Gilli | Amaracarpus Blume | Rubiaceae |
| Melanea Pers., orth. var. | Malanea Aubl. | | | Melanea Pers., orth. var. | Malanea Aubl. | Rubiaceae |
| Melanopsidium Colla | | a | | Melanopsidium Colla | | Rubiaceae |
| Melanopsidium Poit. ex DC. | Alibertia A. Rich. ex DC. | | | Melanopsidium Poit. ex DC. | Alibertia A. Rich. ex DC. | Rubiaceae |
| Mephitidia Reinw. ex Blume | Lasianthus Jack | | | Mephitidia Reinw. ex Blume | Lasianthus Jack | Rubiaceae |
| Mericarpaea Boiss. | | a | | Mericarpaea Boiss. | | Rubiaceae |
| Mericocalyx Bamps | Otiophora Zucc. | | | Mericocalyx Bamps | Otiophora Zucc. | Rubiaceae |
| Merismostigma S. Moore | Coelospermum Blume | | | Merismostigma S. Moore | Coelospermum Blume | Rubiaceae |
| Merumea Steyerm. | | a | | Merumea Steyerm. | | Rubiaceae |
| Mesoptera Hook. f. | Psydrax Gaertn. | | | Mesoptera Hook. f. | Psydrax Gaertn. | Rubiaceae |
| Metabolos Blume | Hedyotis L. | | | Metabolos Blume | Hedyotis L. | Rubiaceae |
| Metadina Bakh. f. | | a | | Metadina Bakh. f. | | Rubiaceae |
| Meyna Roxb. ex Link | | a | | Meyna Roxb. ex Link | | Rubiaceae |
| Meynia Schult., orth. var. | Meyna Roxb. ex Link | | | Meynia Schult., orth. var. | Meyna Roxb. ex Link | Rubiaceae |
| Micrasepalum Urb. | | a | | Micrasepalum Urb. | | Rubiaceae |
| Microphysa Schrenk | | a | | Microphysa Schrenk | | Rubiaceae |
| Microsplenium Hook. f., nom. inval. | Machaonia Humb. & Bonpl. | | | Microsplenium Hook. f., nom. inval. | Machaonia Humb. & Bonpl. | Rubiaceae |
| Mirmecodia Gaudich., orth. var. | Myrmecodia Jack | | | Mirmecodia Gaudich., orth. var. | Myrmecodia Jack | Rubiaceae |
| Mitchella L. | | a | | Mitchella L. | | Rubiaceae |
| Mitracarpus Zucc. | | a | | Mitracarpus Zucc. | | Rubiaceae |
| Mitragyna Korth. | | a | | Mitragyna Korth. | | Rubiaceae |
| Mitrasacmopsis Jovet | | a | | Mitrasacmopsis Jovet | | Rubiaceae |
| Mitrastigma Harv. | Psydrax Gaertn. | | | Mitrastigma Harv. | Psydrax Gaertn. | Rubiaceae |
| Mitratheca K. Schum. | Oldenlandia L. | | | Mitratheca K. Schum. | Oldenlandia L. | Rubiaceae |
| Mitreola Boehm. | Ophiorrhiza L. | | | Mitreola Boehm. | Ophiorrhiza L. | Rubiaceae |
| Mitriostigma Hochst. | | a | | Mitriostigma Hochst. | | Rubiaceae |
| Molopanthera Turcz. | | a | | Molopanthera Turcz. | | Rubiaceae |
| Monadelphanthus H. Karst. | Capirona Spruce | | | Monadelphanthus H. Karst. | Capirona Spruce | Rubiaceae |
| Monosalpinx N. Hallé | | a | | Monosalpinx N. Hallé | | Rubiaceae |
| Montamans Dwyer | | a | | Montamans Dwyer | | Rubiaceae |
| Morelia A. Rich. ex DC. | | a | | Morelia A. Rich. ex DC. | | Rubiaceae |
| Morierina Vieill. | | a | | Morierina Vieill. | | Rubiaceae |
| Morinda L. | | a | | Morinda L. | | Rubiaceae |
| Morindopsis Hook. f. | | a | | Morindopsis Hook. f. | | Rubiaceae |
| Motleyia J. T. Johanss. | Prismatomeris Thwaites | | | Motleyia J. T. Johanss. | Prismatomeris Thwaites | Rubiaceae |
| Mouretia Pit. | | a | | Mouretia Pit. | | Rubiaceae |
| Multidentia Gilli | | a | | Multidentia Gilli | | Rubiaceae |
| Mungos Adans. | Ophiorrhiza L. | | | Mungos Adans. | Ophiorrhiza L. | Rubiaceae |
| Mussaenda L. | | a | | Mussaenda L. | | Rubiaceae |
| Mussaendopsis Baill. | | a | | Mussaendopsis Baill. | | Rubiaceae |
| Mycetia Reinw. | | a | | Mycetia Reinw. | | Rubiaceae |
| Myonima Comm. ex Juss. | | a | | Myonima Comm. ex Juss. | | Rubiaceae |
| Myrioneuron R. Br. ex Benth. & Hook. f. | | a | | Myrioneuron R. Br. ex Benth. & Hook. f. | | Rubiaceae |
| Myrmecodia Jack | | a | | Myrmecodia Jack | | Rubiaceae |
| Myrmecoides Elmer, orth. var. | Myrmecodia Jack | | | Myrmecoides Elmer, orth. var. | Myrmecodia Jack | Rubiaceae |
| Myrmeconauclea Merr. | | a | | Myrmeconauclea Merr. | | Rubiaceae |
| Myrmedoma Becc. | Myrmephytum Becc. | | | Myrmedoma Becc. | Myrmephytum Becc. | Rubiaceae |
| Myrmephytum Becc. | | a | | Myrmephytum Becc. | | Rubiaceae |
| Myrstiphylla Raf. | Psychotria L. | | | Myrstiphylla Raf. | Psychotria L. | Rubiaceae |
| Myrstiphyllum P. Browne | Psychotria L. | | | Myrstiphyllum P. Browne | Psychotria L. | Rubiaceae |
| Nacibaea Poir., orth. var. | Manettia Mutis | | | Nacibaea Poir., orth. var. | Manettia Mutis | Rubiaceae |
| Nacibea Aubl. | Manettia Mutis | | | Nacibea Aubl. | Manettia Mutis | Rubiaceae |
| Naletonia Bremek. | | a | | Naletonia Bremek. | | Rubiaceae |
| Narega Raf. | Catunaregam Wolf | | | Narega Raf. | Catunaregam Wolf | Rubiaceae |
| Nargedia Bedd. | | a | | Nargedia Bedd. | | Rubiaceae |
| Natalanthe Sond. | Tricalysia A. Rich. ex DC. | | | Natalanthe Sond. | Tricalysia A. Rich. ex DC. | Rubiaceae |
| Nauclea L. | | a | | Nauclea L. | | Rubiaceae |
| Neanotis W. H. Lewis | | a | | Neanotis W. H. Lewis | | Rubiaceae |
| Neblinathamnus Steyerm. | | a | | Neblinathamnus Steyerm. | | Rubiaceae |
| Neleixa Raf. | Faramea Aubl. | | | Neleixa Raf. | Faramea Aubl. | Rubiaceae |
| Nematostylis Hook. f. | | a | | Nematostylis Hook. f. | | Rubiaceae |
| Nemostylis Steven | Phuopsis (Griseb.) Hook. f. | | | Nemostylis Steven | Phuopsis (Griseb.) Hook. f. | Rubiaceae |
| Nenax Gaertn. | | a | | Nenax Gaertn. | | Rubiaceae |
| Neobaumannia Hutch. & Dalziel | Knoxia L. | | | Neobaumannia Hutch. & Dalziel | Knoxia L. | Rubiaceae |
| Neobertiera Wernham | | a | | Neobertiera Wernham | | Rubiaceae |
| Neoblakea Standl. | | a | | Neoblakea Standl. | | Rubiaceae |
| Neobreonia Ridsdale | Breonia A. Rich. ex DC. | | | Neobreonia Ridsdale | Breonia A. Rich. ex DC. | Rubiaceae |
| Neofranciella Guillaumin | | a | | Neofranciella Guillaumin | | Rubiaceae |
| Neogaillonia Lincz. | Gaillonia A. Rich. ex DC. | | | Neogaillonia Lincz. | Gaillonia A. Rich. ex DC. | Rubiaceae |
| Neohymenopogon Bennet | | a | | Neohymenopogon Bennet | | Rubiaceae |
| Neolamarckia Bosser | | a | | Neolamarckia Bosser | | Rubiaceae |
| Neolaugeria Nicolson | | a | | Neolaugeria Nicolson | | Rubiaceae |
| Neoleroya Cavaco | Pyrostria Comm. ex Juss. | | | Neoleroya Cavaco | Pyrostria Comm. ex Juss. | Rubiaceae |
| Neomartensia Borhidi & Lozada-Pérez | Martensianthus Borhidi & Lozada-Pérez | | | Neomartensia Borhidi & Lozada-Pérez | Martensianthus Borhidi & Lozada-Pérez | Rubiaceae |
| Neomazaea Krug & Urb. | Mazaea Krug & Urb. | | | Neomazaea Krug & Urb. | Mazaea Krug & Urb. | Rubiaceae |
| Neomussaenda Tange | | a | | Neomussaenda Tange | | Rubiaceae |
| Neonauclea Merr. | | a | | Neonauclea Merr. | | Rubiaceae |
| Neopentanisia Verdc. | Pentanisia Harv. | | | Neopentanisia Verdc. | Pentanisia Harv. | Rubiaceae |
| Neorosea N. Hallé | Tricalysia A. Rich. ex DC. | | | Neorosea N. Hallé | Tricalysia A. Rich. ex DC. | Rubiaceae |
| Neosabicea Wernham | Manettia Mutis | | | Neosabicea Wernham | Manettia Mutis | Rubiaceae |
| Neoschimpera Hemsl. | Psychotria L. | | | Neoschimpera Hemsl. | Psychotria L. | Rubiaceae |
| Nernstia Urb. | | a | | Nernstia Urb. | | Rubiaceae |
| Nertera Banks ex Gaertn. | | a | | Nertera Banks ex Gaertn. | | Rubiaceae |
| Nescidia A. Rich. ex DC. | Coffea L. | | | Nescidia A. Rich. ex DC. | Coffea L. | Rubiaceae |
| Nesohedyotis (Hook. f.) Bremek. | | a | | Nesohedyotis (Hook. f.) Bremek. | | Rubiaceae |
| Nettlera Raf. | Psychotria L. | | | Nettlera Raf. | Psychotria L. | Rubiaceae |
| Neurocalyx Hook. | | a | | Neurocalyx Hook. | | Rubiaceae |
| Neurocarpaea R. Br., nom. inval. | Pentas Benth. | | | Neurocarpaea R. Br., nom. inval. | Pentas Benth. | Rubiaceae |
| Neurocarpaea K. Schum., orth. var. | Nodocarpaea A. Gray | | | Neurocarpaea K. Schum., orth. var. | Nodocarpaea A. Gray | Rubiaceae |
| Nichallea Bridson | | a | | Nichallea Bridson | | Rubiaceae |
| Nobula Adans. | Phyllis L. | | | Nobula Adans. | Phyllis L. | Rubiaceae |
| Nodocarpaea A. Gray | | a | | Nodocarpaea A. Gray | | Rubiaceae |
| Nonatelia Kuntze | Lasianthus Jack | | | Nonatelia Kuntze | Lasianthus Jack | Rubiaceae |
| Nonatelia Aubl. | | a | | Nonatelia Aubl. | | Rubiaceae |
| Normandia Hook. f. | | a | | Normandia Hook. f. | | Rubiaceae |
| Nostolachma T. Durand | | a | | Nostolachma T. Durand | | Rubiaceae |
| Nothocarpus Post & Kuntze | Nodocarpaea A. Gray | | | Nothocarpus Post & Kuntze | Nodocarpaea A. Gray | Rubiaceae |
| Nothophlebia Standl. | Pentagonia Benth. | | | Nothophlebia Standl. | Pentagonia Benth. | Rubiaceae |
| Notodontia Pierre ex Pit. | Ophiorrhiza L. | | | Notodontia Pierre ex Pit. | Ophiorrhiza L. | Rubiaceae |
| Notopleura (Benth.) Bremek. | | a | | Notopleura (Benth.) Bremek. | | Rubiaceae |
| Novatilia Wight, orth. var. | Palicourea Aubl. | | | Novatilia Wight, orth. var. | Palicourea Aubl. | Rubiaceae |
| Obbea Hook. f. | Bobea Gaudich. | | | Obbea Hook. f. | Bobea Gaudich. | Rubiaceae |
| Octavia DC. | Lasianthus Jack | | | Octavia DC. | Lasianthus Jack | Rubiaceae |
| Octodon Thonn. | Spermacoce L. | | | Octodon Thonn. | Spermacoce L. | Rubiaceae |
| Octomeria Pfeiff., orth. var. | Otomeria Benth. | | | Octomeria Pfeiff., orth. var. | Otomeria Benth. | Rubiaceae |
| Octotropis Bedd. | | a | | Octotropis Bedd. | | Rubiaceae |
| Ohigginsia Ruiz & Pav. | Hoffmannia Sw. | | | Ohigginsia Ruiz & Pav. | Hoffmannia Sw. | Rubiaceae |
| Ochreinauclea Ridsdale & Bakh. f. | | a | | Ochreinauclea Ridsdale & Bakh. f. | | Rubiaceae |
| Oldenlandia L. | | a | | Oldenlandia L. | | Rubiaceae |
| Oldenlandiopsis Terrell & W. H. Lewis | | a | | Oldenlandiopsis Terrell & W. H. Lewis | | Rubiaceae |
| Oligocodon Keay | | a | | Oligocodon Keay | | Rubiaceae |
| Olostyla DC. | Coelospermum Blume | | | Olostyla DC. | Coelospermum Blume | Rubiaceae |
| Omalocaldos Hook. f., orth. var. | Faramea Aubl. | | | Omalocaldos Hook. f., orth. var. | Faramea Aubl. | Rubiaceae |
| Omiltemia Standl. | | a | | Omiltemia Standl. | | Rubiaceae |
| Opercularia Gaertn. | | a | | Opercularia Gaertn. | | Rubiaceae |
| Ophiorrhiza L. | | a | | Ophiorrhiza L. | | Rubiaceae |
| Ophryococcus Oerst. | | a | | Ophryococcus Oerst. | | Rubiaceae |
| Oregandra Standl. | | a | | Oregandra Standl. | | Rubiaceae |
| Oreocaryon Kuntze ex K. Schum. | Cruckshanksia Hook. & Arn. | | | Oreocaryon Kuntze ex K. Schum. | Cruckshanksia Hook. & Arn. | Rubiaceae |
| Oreopolus Schltdl. | | a | | Oreopolus Schltdl. | | Rubiaceae |
| Oribasia Schreb. | Palicourea Aubl. | | | Oribasia Schreb. | Palicourea Aubl. | Rubiaceae |
| Orthostemma Wall. ex Voigt, nom. inval. | Pentas Benth. | | | Orthostemma Wall. ex Voigt, nom. inval. | Pentas Benth. | Rubiaceae |
| Osa Aiello | | a | | Osa Aiello | | Rubiaceae |
| Otiophora Zucc. | | a | | Otiophora Zucc. | | Rubiaceae |
| Otocalyx Brandegee | | a | | Otocalyx Brandegee | | Rubiaceae |
| Otocephalus Chiov. | Pentanisia Harv. | | | Otocephalus Chiov. | Pentanisia Harv. | Rubiaceae |
| Otomeria Benth. | | a | | Otomeria Benth. | | Rubiaceae |
| Ottoschmidtia Urb. | | a | | Ottoschmidtia Urb. | | Rubiaceae |
| Ourouparia Aubl. | Uncaria Schreb. | | | Ourouparia Aubl. | Uncaria Schreb. | Rubiaceae |
| Outarda Dumort., orth. var. | Coutarea Aubl. | | | Outarda Dumort., orth. var. | Coutarea Aubl. | Rubiaceae |
| Oxyanthus DC. | | a | | Oxyanthus DC. | | Rubiaceae |
| Oxyceros Lour. | | a | | Oxyceros Lour. | | Rubiaceae |
| Oxyspermum Eckl. & Zeyh. | Galopina Thunb. | | | Oxyspermum Eckl. & Zeyh. | Galopina Thunb. | Rubiaceae |
| Paederia L. | | a | | Paederia L. | | Rubiaceae |
| Paedicalyx Pierre ex Pit. | Xanthophytum Reinw. ex Blume | | | Paedicalyx Pierre ex Pit. | Xanthophytum Reinw. ex Blume | Rubiaceae |
| Pagamea Aubl. | | a | | Pagamea Aubl. | | Rubiaceae |
| Pagameopsis Steyerm. | | a | | Pagameopsis Steyerm. | | Rubiaceae |
| Pachysanthus C. Presl | Rudgea Salisb. | | | Pachysanthus C. Presl | Rudgea Salisb. | Rubiaceae |
| Pachystigma Hochst. | Vangueria Juss. | | | Pachystigma Hochst. | Vangueria Juss. | Rubiaceae |
| Pachystylus K. Schum. | | a | | Pachystylus K. Schum. | | Rubiaceae |
| Paiva Vell. | Sabicea Aubl. | | | Paiva Vell. | Sabicea Aubl. | Rubiaceae |
| Palicourea Aubl. | | a | | Palicourea Aubl. | | Rubiaceae |
| Pallasia Klotzsch | Wittmackanthus Kuntze | | | Pallasia Klotzsch | Wittmackanthus Kuntze | Rubiaceae |
| Pamplethantha Bremek. | | a | | Pamplethantha Bremek. | | Rubiaceae |
| Panetos Raf. | Houstonia Gronov. | | | Panetos Raf. | Houstonia Gronov. | Rubiaceae |
| Panchezia Montrouz. | Ixora L. | | | Panchezia Montrouz. | Ixora L. | Rubiaceae |
| Paolia Chiov. | Coffea L. | | | Paolia Chiov. | Coffea L. | Rubiaceae |
| Pappostyles Pierre | Cremaspora Benth. | | | Pappostyles Pierre | Cremaspora Benth. | Rubiaceae |
| Pappostylum Pierre, orth. var. | Cremaspora Benth. | | | Pappostylum Pierre, orth. var. | Cremaspora Benth. | Rubiaceae |
| Paracephaelis Baill. | | a | | Paracephaelis Baill. | | Rubiaceae |
| Paracoffea J.-F. Leroy, nom. inval. | Psilanthus Hook. f. | | | Paracoffea J.-F. Leroy, nom. inval. | Psilanthus Hook. f. | Rubiaceae |
| Paracorynanthe Capuron | | a | | Paracorynanthe Capuron | | Rubiaceae |
| Paradina Pierre ex Pit. | Mitragyna Korth. | | | Paradina Pierre ex Pit. | Mitragyna Korth. | Rubiaceae |
| Paragenipa Baill. | | a | | Paragenipa Baill. | | Rubiaceae |
| Paragophyton K. Schum. | Spermacoce L. | | | Paragophyton K. Schum. | Spermacoce L. | Rubiaceae |
| Parachimarrhis Ducke | | a | | Parachimarrhis Ducke | | Rubiaceae |
| Paraknoxia Bremek. | Pentanisia Harv. | | | Paraknoxia Bremek. | Pentanisia Harv. | Rubiaceae |
| Paranotis Pedley ex K. L. Gibbons | | a | | Paranotis Pedley ex K. L. Gibbons | | Rubiaceae |
| Parapentas Bremek. | | a | | Parapentas Bremek. | | Rubiaceae |
| Paratriaina Bremek. | Triainolepis Hook. f. | | | Paratriaina Bremek. | Triainolepis Hook. f. | Rubiaceae |
| Paravinia Hassk., orth. var. | Praravinia Korth. | | | Paravinia Hassk., orth. var. | Praravinia Korth. | Rubiaceae |
| Patabea Aubl. | Ixora L. | | | Patabea Aubl. | Ixora L. | Rubiaceae |
| Patima Aubl. | Sabicea Aubl. | | | Patima Aubl. | Sabicea Aubl. | Rubiaceae |
| Patsjotti Adans. | Strumpfia Jacq. | | | Patsjotti Adans. | Strumpfia Jacq. | Rubiaceae |
| Pauridiantha Hook. f. | | a | | Pauridiantha Hook. f. | | Rubiaceae |
| Pausinystalia Pierre ex Beille | | a | | Pausinystalia Pierre ex Beille | | Rubiaceae |
| Pavate Adans. | Pavetta L. | | | Pavate Adans. | Pavetta L. | Rubiaceae |
| Pavetta L. | | a | | Pavetta L. | | Rubiaceae |
| Payera Baill. | | a | | Payera Baill. | | Rubiaceae |
| Peckeya Raf., orth. var. | Coussarea Aubl. | | | Peckeya Raf., orth. var. | Coussarea Aubl. | Rubiaceae |
| Pegamea Vitman, orth. var. | Pagamea Aubl. | | | Pegamea Vitman, orth. var. | Pagamea Aubl. | Rubiaceae |
| Pecheya Scop. | Coussarea Aubl. | | | Pecheya Scop. | Coussarea Aubl. | Rubiaceae |
| Pelagodendron Seem. | | a | | Pelagodendron Seem. | | Rubiaceae |
| Pelaphia Banks & Sol., nom. inval. | Coprosma J. R. Forst. & G. Forst. | | | Pelaphia Banks & Sol., nom. inval. | Coprosma J. R. Forst. & G. Forst. | Rubiaceae |
| Peltospermum Benth. | Sacosperma G. Taylor | | | Peltospermum Benth. | Sacosperma G. Taylor | Rubiaceae |
| Pentacarpaea Hiern | Pentanisia Harv. | | | Pentacarpaea Hiern | Pentanisia Harv. | Rubiaceae |
| Pentacarpus Post & Kuntze, orth. var. | Pentanisia Harv. | | | Pentacarpus Post & Kuntze, orth. var. | Pentanisia Harv. | Rubiaceae |
| Pentagonia Benth. | | a | | Pentagonia Benth. | | Rubiaceae |
| Pentaloncha Hook. f. | | a | | Pentaloncha Hook. f. | | Rubiaceae |
| Pentanisia Harv. | | a | | Pentanisia Harv. | | Rubiaceae |
| Pentanopsis Rendle | | a | | Pentanopsis Rendle | | Rubiaceae |
| Pentas Benth. | | a | | Pentas Benth. | | Rubiaceae |
| Pentodon Hochst. | | a | | Pentodon Hochst. | | Rubiaceae |
| Peponidium (Baill.) Arènes | | a | | Peponidium (Baill.) Arènes | | Rubiaceae |
| Perakanthus Robyns | | a | | Perakanthus Robyns | | Rubiaceae |
| Perama Aubl. | | a | | Perama Aubl. | | Rubiaceae |
| Peratanthe Urb. | Nertera Banks ex Gaertn. | | | Peratanthe Urb. | Nertera Banks ex Gaertn. | Rubiaceae |
| Perdicesca Prov. | Mitchella L. | | | Perdicesca Prov. | Mitchella L. | Rubiaceae |
| Peripeplus Pierre | | a | | Peripeplus Pierre | | Rubiaceae |
| Pertusadina Ridsdale | | a | | Pertusadina Ridsdale | | Rubiaceae |
| Petagomoa Bremek. | | a | | Petagomoa Bremek. | | Rubiaceae |
| Peteria Raf., orth. var. | Rondeletia L. | | | Peteria Raf., orth. var. | Rondeletia L. | Rubiaceae |
| Petesia P. Browne | Rondeletia L. | | | Petesia P. Browne | Rondeletia L. | Rubiaceae |
| Petitiocodon Robbr. | | a | | Petitiocodon Robbr. | | Rubiaceae |
| Petunga DC. | Hypobathrum Blume | | | Petunga DC. | Hypobathrum Blume | Rubiaceae |
| Phallaria Schumach. | Psydrax Gaertn. | | | Phallaria Schumach. | Psydrax Gaertn. | Rubiaceae |
| Phellocalyx Bridson | | a | | Phellocalyx Bridson | | Rubiaceae |
| Phialanthus Griseb. | | a | | Phialanthus Griseb. | | Rubiaceae |
| Phialiphora Groeninckx | | a | | Phialiphora Groeninckx | | Rubiaceae |
| Phitopis Hook. f. | | a | | Phitopis Hook. f. | | Rubiaceae |
| Phosanthus Raf., nom. inval. | Isertia Schreb. | | | Phosanthus Raf., nom. inval. | Isertia Schreb. | Rubiaceae |
| Phuopsis (Griseb.) Hook. f. | | a | | Phuopsis (Griseb.) Hook. f. | | Rubiaceae |
| Phylanthera Noronha | Hypobathrum Blume | | | Phylanthera Noronha | Hypobathrum Blume | Rubiaceae |
| Phyllacantha Hook. f., orth. var. | Phyllacanthus Hook. f. | | | Phyllacantha Hook. f., orth. var. | Phyllacanthus Hook. f. | Rubiaceae |
| Phyllacanthus Hook. f. | | a | | Phyllacanthus Hook. f. | | Rubiaceae |
| Phyllis L. | | a | | Phyllis L. | | Rubiaceae |
| Phyllocrater Wernham | | a | | Phyllocrater Wernham | | Rubiaceae |
| Phyllomelia Griseb. | | a | | Phyllomelia Griseb. | | Rubiaceae |
| Phyllopentas (Verdc.) Kårehed & B. Bremer | | a | | Phyllopentas (Verdc.) Kårehed & B. Bremer | | Rubiaceae |
| Phylohydrax Puff | | a | | Phylohydrax Puff | | Rubiaceae |
| Phyteumoides Smeathman ex DC. | Virectaria Bremek. | | | Phyteumoides Smeathman ex DC. | Virectaria Bremek. | Rubiaceae |
| Picardaea Urb. | | a | | Picardaea Urb. | | Rubiaceae |
| Pimentelia Wedd. | | a | | Pimentelia Wedd. | | Rubiaceae |
| Pinarophyllon Brandegee | | a | | Pinarophyllon Brandegee | | Rubiaceae |
| Pinckneya Michx. | | a | | Pinckneya Michx. | | Rubiaceae |
| Pinknea Pers., orth. var. | Pinckneya Michx. | | | Pinknea Pers., orth. var. | Pinckneya Michx. | Rubiaceae |
| Piringa Juss. | Gardenia J. Ellis | | | Piringa Juss. | Gardenia J. Ellis | Rubiaceae |
| Pitardella Tirveng. | | a | | Pitardella Tirveng. | | Rubiaceae |
| Pittierothamnus Steyerm. | Amphidasya Standl. | | | Pittierothamnus Steyerm. | Amphidasya Standl. | Rubiaceae |
| Pittoniotis Griseb. | | a | | Pittoniotis Griseb. | | Rubiaceae |
| Placocarpa Hook. f. | | a | | Placocarpa Hook. f. | | Rubiaceae |
| Placodium Hook. f. | Plocama Aiton | | | Placodium Hook. f. | Plocama Aiton | Rubiaceae |
| Placoma J. F. Gmel., orth. var. | Plocama Aiton | | | Placoma J. F. Gmel., orth. var. | Plocama Aiton | Rubiaceae |
| Placopoda Balf. f. | Dirichletia Klotzsch | | | Placopoda Balf. f. | Dirichletia Klotzsch | Rubiaceae |
| Planaltina R. M. Salas & E. L. Cabral | | a | | Planaltina R. M. Salas & E. L. Cabral | | Rubiaceae |
| Plastolaena Pierre ex A. Chev. | Schumanniophyton Harms | | | Plastolaena Pierre ex A. Chev. | Schumanniophyton Harms | Rubiaceae |
| Platanocarpum Korth. | Nauclea L. | | | Platanocarpum Korth. | Nauclea L. | Rubiaceae |
| Platanocephalus Crantz | Nauclea L. | | | Platanocephalus Crantz | Nauclea L. | Rubiaceae |
| Platycarpum Humb. & Bonpl. | | a | | Platycarpum Humb. & Bonpl. | | Rubiaceae |
| Platymerium Bartl. ex DC. | Hypobathrum Blume | | | Platymerium Bartl. ex DC. | Hypobathrum Blume | Rubiaceae |
| Plectroniella Robyns | | a | | Plectroniella Robyns | | Rubiaceae |
| Pleimeris Raf. | Gardenia J. Ellis | | | Pleimeris Raf. | Gardenia J. Ellis | Rubiaceae |
| Pleiocarpidia K. Schum. | | a | | Pleiocarpidia K. Schum. | | Rubiaceae |
| Pleiocoryne Rauschert | | a | | Pleiocoryne Rauschert | | Rubiaceae |
| Pleiocraterium Bremek. | | a | | Pleiocraterium Bremek. | | Rubiaceae |
| Pleotheca Wall., nom. inval. | Spiradiclis Blume | | | Pleotheca Wall., nom. inval. | Spiradiclis Blume | Rubiaceae |
| Plethyrsis Raf. | Richardia L. | | | Plethyrsis Raf. | Richardia L. | Rubiaceae |
| Pleureia Raf. | Psychotria L. | | | Pleureia Raf. | Psychotria L. | Rubiaceae |
| Pleurocarpus Klotzsch | Cinchona L. | | | Pleurocarpus Klotzsch | Cinchona L. | Rubiaceae |
| Pleurocoffea Baill. | Coffea L. | | | Pleurocoffea Baill. | Coffea L. | Rubiaceae |
| Pliocarpida Post & Kuntze, orth. var. | Pleiocarpidia K. Schum. | | | Pliocarpida Post & Kuntze, orth. var. | Pleiocarpidia K. Schum. | Rubiaceae |
| Plocama Aiton | | a | | Plocama Aiton | | Rubiaceae |
| Plocaniophyllon Brandegee | Deppea Cham. & Schltdl. | | | Plocaniophyllon Brandegee | Deppea Cham. & Schltdl. | Rubiaceae |
| Poecilocalyx Bremek. | | a | | Poecilocalyx Bremek. | | Rubiaceae |
| Poederiopsis Rusby | Manettia Mutis | | | Poederiopsis Rusby | Manettia Mutis | Rubiaceae |
| Pogonanthus Montrouz. | Gynochthodes Blume | | | Pogonanthus Montrouz. | Gynochthodes Blume | Rubiaceae |
| Pogonolobus F. Muell. | Coelospermum Blume | | | Pogonolobus F. Muell. | Coelospermum Blume | Rubiaceae |
| Pogonopus Klotzsch | | a | | Pogonopus Klotzsch | | Rubiaceae |
| Poiretia J. F. Gmel. | Houstonia Gronov. | | | Poiretia J. F. Gmel. | Houstonia Gronov. | Rubiaceae |
| Polycoryne Keay | Pleiocoryne Rauschert | | | Polycoryne Keay | Pleiocoryne Rauschert | Rubiaceae |
| Polycycliska Ridl. | Lerchea L. | | | Polycycliska Ridl. | Lerchea L. | Rubiaceae |
| Polyozus Lour. | Psychotria L. | | | Polyozus Lour. | Psychotria L. | Rubiaceae |
| Polyphragmon Desf. | Timonius DC. | | | Polyphragmon Desf. | Timonius DC. | Rubiaceae |
| Polysolen Rauschert | Indopolysolenia Bennet | | | Polysolen Rauschert | Indopolysolenia Bennet | Rubiaceae |
| Polysolenia Hook. f. | Indopolysolenia Bennet | | | Polysolenia Hook. f. | Indopolysolenia Bennet | Rubiaceae |
| Polysphaeria Hook. f. | | a | | Polysphaeria Hook. f. | | Rubiaceae |
| Polyura Hook. f. | | a | | Polyura Hook. f. | | Rubiaceae |
| Pomangium Reinw. | Argostemma Wall. | | | Pomangium Reinw. | Argostemma Wall. | Rubiaceae |
| Pomatium C. F. Gaertn. | Bertiera Aubl. | | | Pomatium C. F. Gaertn. | Bertiera Aubl. | Rubiaceae |
| Pomax Sol. ex DC. | | a | | Pomax Sol. ex DC. | | Rubiaceae |
| Pomazota Ridl. | Coptophyllum Korth. | | | Pomazota Ridl. | Coptophyllum Korth. | Rubiaceae |
| Porocarpus Gaertn. | Timonius DC. | | | Porocarpus Gaertn. | Timonius DC. | Rubiaceae |
| Porterandia Ridl. | | a | | Porterandia Ridl. | | Rubiaceae |
| Portlandia P. Browne | | a | | Portlandia P. Browne | | Rubiaceae |
| Posoqueria Aubl. | | a | | Posoqueria Aubl. | | Rubiaceae |
| Posoria Raf. | Posoqueria Aubl. | | | Posoria Raf. | Posoqueria Aubl. | Rubiaceae |
| Potima R. Hedw. | Faramea Aubl. | | | Potima R. Hedw. | Faramea Aubl. | Rubiaceae |
| Pouchetia A. Rich. ex DC. | | a | | Pouchetia A. Rich. ex DC. | | Rubiaceae |
| Praravinia Korth. | | a | | Praravinia Korth. | | Rubiaceae |
| Pravinaria Bremek. | | a | | Pravinaria Bremek. | | Rubiaceae |
| Preussiodora Keay | | a | | Preussiodora Keay | | Rubiaceae |
| Princea Dubard & Dop | Triainolepis Hook. f. | | | Princea Dubard & Dop | Triainolepis Hook. f. | Rubiaceae |
| Prismatomeris Thwaites | | a | | Prismatomeris Thwaites | | Rubiaceae |
| Pristidia Thwaites | Gaertnera Lam. | | | Pristidia Thwaites | Gaertnera Lam. | Rubiaceae |
| Probletostemon K. Schum. | Tricalysia A. Rich. ex DC. | | | Probletostemon K. Schum. | Tricalysia A. Rich. ex DC. | Rubiaceae |
| Proscephaleium Korth. | | a | | Proscephaleium Korth. | | Rubiaceae |
| Psathura Comm. ex Juss. | | a | | Psathura Comm. ex Juss. | | Rubiaceae |
| Pseudaidia Tirveng. | | a | | Pseudaidia Tirveng. | | Rubiaceae |
| Pseudixora Miq. | Anomanthodia Hook. f. | | | Pseudixora Miq. | Anomanthodia Hook. f. | Rubiaceae |
| Pseudocinchona A. Chev. | | a | | Pseudocinchona A. Chev. | | Rubiaceae |
| Pseudodiplospora Deb | | a | | Pseudodiplospora Deb | | Rubiaceae |
| Pseudogaillonia Lincz. | | a | | Pseudogaillonia Lincz. | | Rubiaceae |
| Pseudogalium L. E Yang et al. | | a | | Pseudogalium L. E Yang et al. | | Rubiaceae |
| Pseudogardenia Keay | Adenorandia Vermoesen | | | Pseudogardenia Keay | Adenorandia Vermoesen | Rubiaceae |
| Pseudohamelia Wernham | | a | | Pseudohamelia Wernham | | Rubiaceae |
| Pseudochimarrhis Ducke | Chimarrhis Jacq. | | | Pseudochimarrhis Ducke | Chimarrhis Jacq. | Rubiaceae |
| Pseudomantalania J.-F. Leroy | | a | | Pseudomantalania J.-F. Leroy | | Rubiaceae |
| Pseudomussaenda Wernham | | a | | Pseudomussaenda Wernham | | Rubiaceae |
| Pseudonesohedyotis Tennant | | a | | Pseudonesohedyotis Tennant | | Rubiaceae |
| Pseudopeponidium Homolle ex Arènes | Pyrostria Comm. ex Juss. | | | Pseudopeponidium Homolle ex Arènes | Pyrostria Comm. ex Juss. | Rubiaceae |
| Pseudopyxis Miq. | | a | | Pseudopyxis Miq. | | Rubiaceae |
| Pseudorachicallis Post & Kuntze, orth. var. | Arcytophyllum Willd. ex Schult. & Schult. f. | | | Pseudorachicallis Post & Kuntze, orth. var. | Arcytophyllum Willd. ex Schult. & Schult. f. | Rubiaceae |
| Pseudorhachicallis Hook. f. | Arcytophyllum Willd. ex Schult. & Schult. f. | | | Pseudorhachicallis Hook. f. | Arcytophyllum Willd. ex Schult. & Schult. f. | Rubiaceae |
| Pseudosabicea N. Hallé | | a | | Pseudosabicea N. Hallé | | Rubiaceae |
| Psilanthopsis A. Chev. | Coffea L. | | | Psilanthopsis A. Chev. | Coffea L. | Rubiaceae |
| Psilanthus Hook. f. | Coffea L. | | | Psilanthus Hook. f. | Coffea L. | Rubiaceae |
| Psilobium Jack | Acranthera Arn. ex Meisn. | | | Psilobium Jack | Acranthera Arn. ex Meisn. | Rubiaceae |
| Psilostoma Klotzsch | Canthium Lam. | | | Psilostoma Klotzsch | Canthium Lam. | Rubiaceae |
| Pstathura Raf., orth. var. | Psathura Comm. ex Juss. | | | Pstathura Raf., orth. var. | Psathura Comm. ex Juss. | Rubiaceae |
| Psydrax Gaertn. | | a | | Psydrax Gaertn. | | Rubiaceae |
| Psychotria L. | | a | | Psychotria L. | | Rubiaceae |
| Psychotrophum P. Browne | Psychotria L. | | | Psychotrophum P. Browne | Psychotria L. | Rubiaceae |
| Psyllocarpus Mart. & Zucc. | | a | | Psyllocarpus Mart. & Zucc. | | Rubiaceae |
| Pteridocalyx Wernham | | a | | Pteridocalyx Wernham | | Rubiaceae |
| Pterogaillonia Lincz. | | a | | Pterogaillonia Lincz. | | Rubiaceae |
| Pterostephus C. Presl | Spermacoce L. | | | Pterostephus C. Presl | Spermacoce L. | Rubiaceae |
| Ptychodea Willd. ex Cham. & Schltdl., nom. inval. | Sipanea Aubl. | | | Ptychodea Willd. ex Cham. & Schltdl., nom. inval. | Sipanea Aubl. | Rubiaceae |
| Ptychostigma Hochst., nom. inval. | Galiniera Delile | | | Ptychostigma Hochst., nom. inval. | Galiniera Delile | Rubiaceae |
| Pubeta L. | Duroia L. f. | | | Pubeta L. | Duroia L. f. | Rubiaceae |
| Pubistylus Thoth. | | a | | Pubistylus Thoth. | | Rubiaceae |
| Putoria Pers. | | a | | Putoria Pers. | | Rubiaceae |
| Pygmaeothamnus Robyns | | a | | Pygmaeothamnus Robyns | | Rubiaceae |
| Pyragra Bremek. | | a | | Pyragra Bremek. | | Rubiaceae |
| Pyrostria Comm. ex Juss. | | a | | Pyrostria Comm. ex Juss. | | Rubiaceae |
| Quinquina Boehm. | Cinchona L. | | | Quinquina Boehm. | Cinchona L. | Rubiaceae |
| Rachicallis DC. | | a | | Rachicallis DC. | | Rubiaceae |
| Ramosmania Tirveng. & Verdc. | | a | | Ramosmania Tirveng. & Verdc. | | Rubiaceae |
| Ramspekia Scop. | Posoqueria Aubl. | | | Ramspekia Scop. | Posoqueria Aubl. | Rubiaceae |
| Randia L. | | a | | Randia L. | | Rubiaceae |
| Rangia Griseb., orth. var. | Randia L. | | | Rangia Griseb., orth. var. | Randia L. | Rubiaceae |
| Raritebe Wernham | | a | | Raritebe Wernham | | Rubiaceae |
| Ravnia Oerst. | Hillia Jacq. | | | Ravnia Oerst. | Hillia Jacq. | Rubiaceae |
| Razafimandimbisonia Kainul. | | a | | Razafimandimbisonia Kainul. | | Rubiaceae |
| Readea Gillespie | | a | | Readea Gillespie | | Rubiaceae |
| Relbunium (Endl.) Hook. f. | Galium L. | | | Relbunium (Endl.) Hook. f. | Galium L. | Rubiaceae |
| Remijia DC. | | a | | Remijia DC. | | Rubiaceae |
| Rennellia Korth. | | a | | Rennellia Korth. | | Rubiaceae |
| Restiaria Lour. | Uncaria Schreb. | | | Restiaria Lour. | Uncaria Schreb. | Rubiaceae |
| Retiniphyllum Humb. & Bonpl. | | a | | Retiniphyllum Humb. & Bonpl. | | Rubiaceae |
| Reussia Dennst., nom. inval. | Paederia L. | | | Reussia Dennst., nom. inval. | Paederia L. | Rubiaceae |
| Rhabdostigma Hook. f. | Kraussia Harv. | | | Rhabdostigma Hook. f. | Kraussia Harv. | Rubiaceae |
| Rhadinopus S. Moore | | a | | Rhadinopus S. Moore | | Rubiaceae |
| Rhachicallis DC., orth. var. | Rachicallis DC. | | | Rhachicallis DC., orth. var. | Rachicallis DC. | Rubiaceae |
| Rhaphidura Bremek. | | a | | Rhaphidura Bremek. | | Rubiaceae |
| Rhipidantha Bremek. | | a | | Rhipidantha Bremek. | | Rubiaceae |
| Rhodopentas Kårehed & B. Bremer | | a | | Rhodopentas Kårehed & B. Bremer | | Rubiaceae |
| Rhodostoma Scheidw. | Palicourea Aubl. | | | Rhodostoma Scheidw. | Palicourea Aubl. | Rubiaceae |
| Rhombospora Korth. | Greenea Wight & Arn. | | | Rhombospora Korth. | Greenea Wight & Arn. | Rubiaceae |
| Rhopalobrachium Schltr. & K. Krause | Cyclophyllum Hook. f. | | | Rhopalobrachium Schltr. & K. Krause | Cyclophyllum Hook. f. | Rubiaceae |
| Rhyssocarpus Endl. | | a | | Rhyssocarpus Endl. | | Rubiaceae |
| Rhytidotus Hook. f., orth. var. | Bobea Gaudich. | | | Rhytidotus Hook. f., orth. var. | Bobea Gaudich. | Rubiaceae |
| Ricardia Adans., orth. var. | Richardia L. | | | Ricardia Adans., orth. var. | Richardia L. | Rubiaceae |
| Richardia L. | | a | | Richardia L. | | Rubiaceae |
| Richardsonia Kunth | Richardia L. | | | Richardsonia Kunth | Richardia L. | Rubiaceae |
| Riodocea Delprete | | a | | Riodocea Delprete | | Rubiaceae |
| Riqueuria Ruiz & Pav. | | a | | Riqueuria Ruiz & Pav. | | Rubiaceae |
| Robbrechtia De Block | | a | | Robbrechtia De Block | | Rubiaceae |
| Robynsia Hutch. | | a | | Robynsia Hutch. | | Rubiaceae |
| Rogiera Planch. | Rondeletia L. | | | Rogiera Planch. | Rondeletia L. | Rubiaceae |
| Roigella Borhidi & M. Fernández | | a | | Roigella Borhidi & M. Fernández | | Rubiaceae |
| Rojoc Adans. | Morinda L. | | | Rojoc Adans. | Morinda L. | Rubiaceae |
| Ronabea Aubl. | | a | | Ronabea Aubl. | | Rubiaceae |
| Ronabia St.-Lag., orth. var. | Psychotria L. | | | Ronabia St.-Lag., orth. var. | Psychotria L. | Rubiaceae |
| Rondeletia L. | | a | | Rondeletia L. | | Rubiaceae |
| Rosea Klotzsch | Tricalysia A. Rich. ex DC. | | | Rosea Klotzsch | Tricalysia A. Rich. ex DC. | Rubiaceae |
| Rosenbergiodendron Fagerl. | | a | | Rosenbergiodendron Fagerl. | | Rubiaceae |
| Rotheria Meyen | Cruckshanksia Hook. & Arn. | | | Rotheria Meyen | Cruckshanksia Hook. & Arn. | Rubiaceae |
| Rothmannia Thunb. | | a | | Rothmannia Thunb. | | Rubiaceae |
| Rovaeanthus Borhidi et al. | | a | | Rovaeanthus Borhidi et al. | | Rubiaceae |
| Rubeola Hill | Sherardia L. | | | Rubeola Hill | Sherardia L. | Rubiaceae |
| Rubeola Mill. | Crucianella L. | | | Rubeola Mill. | Crucianella L. | Rubiaceae |
| Rubia L. | | a | | Rubia L. | | Rubiaceae |
| Rubioides G. Perkins | Opercularia Gaertn. | | | Rubioides G. Perkins | Opercularia Gaertn. | Rubiaceae |
| Rudgea Salisb. | | a | | Rudgea Salisb. | | Rubiaceae |
| Rustia Klotzsch | | a | | Rustia Klotzsch | | Rubiaceae |
| Rutidea DC. | | a | | Rutidea DC. | | Rubiaceae |
| Rytidea Spreng., orth. var. | Rutidea DC. | | | Rytidea Spreng., orth. var. | Rutidea DC. | Rubiaceae |
| Rytidotus Hook. f. | Bobea Gaudich. | | | Rytidotus Hook. f. | Bobea Gaudich. | Rubiaceae |
| Rytigynia Blume | | a | | Rytigynia Blume | | Rubiaceae |
| Sabicea Aubl. | | a | | Sabicea Aubl. | | Rubiaceae |
| Sacconia Endl. | Chione DC. | | | Sacconia Endl. | Chione DC. | Rubiaceae |
| Sacosperma G. Taylor | | a | | Sacosperma G. Taylor | | Rubiaceae |
| Sahlbergia Neck., nom. inval. | Gardenia J. Ellis | | | Sahlbergia Neck., nom. inval. | Gardenia J. Ellis | Rubiaceae |
| Saldanha Vell. | Hillia Jacq. | | | Saldanha Vell. | Hillia Jacq. | Rubiaceae |
| Saldinia A. Rich. ex DC. | | a | | Saldinia A. Rich. ex DC. | | Rubiaceae |
| Salzmannia DC. | | a | | Salzmannia DC. | | Rubiaceae |
| Santalina Baill. | Tarenna Gaertn. | | | Santalina Baill. | Tarenna Gaertn. | Rubiaceae |
| Santia Wight & Arn. | Lasianthus Jack | | | Santia Wight & Arn. | Lasianthus Jack | Rubiaceae |
| Saprosma Blume | | a | | Saprosma Blume | | Rubiaceae |
| Sarcocephalus Afzel. ex Sabine | | a | | Sarcocephalus Afzel. ex Sabine | | Rubiaceae |
| Sarcopygme Setch. & Christoph. | Morinda L. | | | Sarcopygme Setch. & Christoph. | Morinda L. | Rubiaceae |
| Sardinia Vell. | Guettarda L. | | | Sardinia Vell. | Guettarda L. | Rubiaceae |
| Sarissus Gaertn. | Hydrophylax L. f. | | | Sarissus Gaertn. | Hydrophylax L. f. | Rubiaceae |
| Scandentia E. L. Cabral & Bacigalupo, nom. inval. | Denscantia E. L. Cabral & Bacigalupo | | | Scandentia E. L. Cabral & Bacigalupo, nom. inval. | Denscantia E. L. Cabral & Bacigalupo | Rubiaceae |
| Scepseothamnus Cham. | Alibertia A. Rich. ex DC. | | | Scepseothamnus Cham. | Alibertia A. Rich. ex DC. | Rubiaceae |
| Sclerococcus Bartl., nom. inval. | Hedyotis L. | | | Sclerococcus Bartl., nom. inval. | Hedyotis L. | Rubiaceae |
| Scleromitrion (Wight & Arn.) Meisn. | | a | | Scleromitrion (Wight & Arn.) Meisn. | | Rubiaceae |
| Scolosanthus Vahl | | a | | Scolosanthus Vahl | | Rubiaceae |
| Scyphiphora C. F. Gaertn. | | a | | Scyphiphora C. F. Gaertn. | | Rubiaceae |
| Scyphochlamys Balf. f. | | a | | Scyphochlamys Balf. f. | | Rubiaceae |
| Scyphostachys Thwaites | | a | | Scyphostachys Thwaites | | Rubiaceae |
| Seemannia Hook., nom. inval. | Pentagonia Benth. | | | Seemannia Hook., nom. inval. | Pentagonia Benth. | Rubiaceae |
| Semaphyllanthe L. Andersson | Calycophyllum DC. | | | Semaphyllanthe L. Andersson | Calycophyllum DC. | Rubiaceae |
| Sericanthe Robbr. | | a | | Sericanthe Robbr. | | Rubiaceae |
| Serissa Comm. ex Juss. | | a | | Serissa Comm. ex Juss. | | Rubiaceae |
| Sestinia Boiss. & Hohen. | Wendlandia Bartl. ex DC. | | | Sestinia Boiss. & Hohen. | Wendlandia Bartl. ex DC. | Rubiaceae |
| Seychellea Razafim. et al. | | a | | Seychellea Razafim. et al. | | Rubiaceae |
| Shaferocharis Urb. | | a | | Shaferocharis Urb. | | Rubiaceae |
| Sherardia L. | | a | | Sherardia L. | | Rubiaceae |
| Sherbournia G. Don | | a | | Sherbournia G. Don | | Rubiaceae |
| Schachtia H. Karst. | | a | | Schachtia H. Karst. | | Rubiaceae |
| Schenckia K. Schum. | Deppea Cham. & Schltdl. | | | Schenckia K. Schum. | Deppea Cham. & Schltdl. | Rubiaceae |
| Schetti Adans. | Ixora L. | | | Schetti Adans. | Ixora L. | Rubiaceae |
| Schiedea A. Rich. | Machaonia Humb. & Bonpl. | | | Schiedea A. Rich. | Machaonia Humb. & Bonpl. | Rubiaceae |
| Schiedea Bartl., nom. inval. | Richardia L. | | | Schiedea Bartl., nom. inval. | Richardia L. | Rubiaceae |
| Schismatoclada Baker | | a | | Schismatoclada Baker | | Rubiaceae |
| Schizangium Bartl. ex DC. | Mitracarpus Zucc. | | | Schizangium Bartl. ex DC. | Mitracarpus Zucc. | Rubiaceae |
| Schizenterospermum Homolle ex Arènes | | a | | Schizenterospermum Homolle ex Arènes | | Rubiaceae |
| Schizocalyx Wedd. | Bathysa C. Presl | | | Schizocalyx Wedd. | Bathysa C. Presl | Rubiaceae |
| Schizocolea Bremek. | | a | | Schizocolea Bremek. | | Rubiaceae |
| Schizomussaenda H. L. Li | | a | | Schizomussaenda H. L. Li | | Rubiaceae |
| Schizospermum Boivin ex Baill. | Cremaspora Benth. | | | Schizospermum Boivin ex Baill. | Cremaspora Benth. | Rubiaceae |
| Schizostigma Arn. ex Meisn. | | a | | Schizostigma Arn. ex Meisn. | | Rubiaceae |
| Schmidtottia Urb. | | a | | Schmidtottia Urb. | | Rubiaceae |
| Schoenleinia Klotzsch | Bathysa C. Presl | | | Schoenleinia Klotzsch | Bathysa C. Presl | Rubiaceae |
| Schradera Vahl | | a | | Schradera Vahl | | Rubiaceae |
| Schreibersia Pohl | Augusta Pohl | | | Schreibersia Pohl | Augusta Pohl | Rubiaceae |
| Schumanniophyton Harms | | a | | Schumanniophyton Harms | | Rubiaceae |
| Schwendenera K. Schum. | | a | | Schwendenera K. Schum. | | Rubiaceae |
| Schwenkfelda Schreb. | Sabicea Aubl. | | | Schwenkfelda Schreb. | Sabicea Aubl. | Rubiaceae |
| Schwenkfeldia Willd., orth. var. | Sabicea Aubl. | | | Schwenkfeldia Willd., orth. var. | Sabicea Aubl. | Rubiaceae |
| Sicelium P. Browne | Coccocypselum P. Browne | | | Sicelium P. Browne | Coccocypselum P. Browne | Rubiaceae |
| Sickingia Willd. | Simira Aubl. | | | Sickingia Willd. | Simira Aubl. | Rubiaceae |
| Siderobombyx Bremek. | Xanthophytum Reinw. ex Blume | | | Siderobombyx Bremek. | Xanthophytum Reinw. ex Blume | Rubiaceae |
| Siderodendrum Schreb. | Ixora L. | | | Siderodendrum Schreb. | Ixora L. | Rubiaceae |
| Sideroxyloides Jacq. | Ixora L. | | | Sideroxyloides Jacq. | Ixora L. | Rubiaceae |
| Siemensia Urb. | | a | | Siemensia Urb. | | Rubiaceae |
| Simira Aubl. | | a | | Simira Aubl. | | Rubiaceae |
| Sinoadina Ridsdale | | a | | Sinoadina Ridsdale | | Rubiaceae |
| Sipanea Aubl. | | a | | Sipanea Aubl. | | Rubiaceae |
| Sipaneopsis Steyerm. | | a | | Sipaneopsis Steyerm. | | Rubiaceae |
| Siphomeris Bojer | Paederia L. | | | Siphomeris Bojer | Paederia L. | Rubiaceae |
| Siphonandra Turcz. | Chiococca P. Browne | | | Siphonandra Turcz. | Chiococca P. Browne | Rubiaceae |
| Siphonandrium K. Schum. | | a | | Siphonandrium K. Schum. | | Rubiaceae |
| Siphonia Benth. | Augusta Pohl | | | Siphonia Benth. | Augusta Pohl | Rubiaceae |
| Solena Willd. | Posoqueria Aubl. | | | Solena Willd. | Posoqueria Aubl. | Rubiaceae |
| Solenandra Hook. f. | Exostema (Pers.) Humb. & Bonpl. | | | Solenandra Hook. f. | Exostema (Pers.) Humb. & Bonpl. | Rubiaceae |
| Solenixora Baill. | Coffea L. | | | Solenixora Baill. | Coffea L. | Rubiaceae |
| Sommera Schltdl. | | a | | Sommera Schltdl. | | Rubiaceae |
| Spallanzania DC. | Mussaenda L. | | | Spallanzania DC. | Mussaenda L. | Rubiaceae |
| Spathichlamys R. Parker | | a | | Spathichlamys R. Parker | | Rubiaceae |
| Spermacoce L. | | a | | Spermacoce L. | | Rubiaceae |
| Spermacoceodes Kuntze | Spermacoce L. | | | Spermacoceodes Kuntze | Spermacoce L. | Rubiaceae |
| Spermacon Raf. | Spermacoce L. | | | Spermacon Raf. | Spermacoce L. | Rubiaceae |
| Spermadictyon Roxb. | | a | | Spermadictyon Roxb. | | Rubiaceae |
| Sphaerophora Blume | Gynochthodes Blume | | | Sphaerophora Blume | Gynochthodes Blume | Rubiaceae |
| Sphinctanthus Benth. | | a | | Sphinctanthus Benth. | | Rubiaceae |
| Spicillaria A. Rich. | Hypobathrum Blume | | | Spicillaria A. Rich. | Hypobathrum Blume | Rubiaceae |
| Spiradiclis Blume | | a | | Spiradiclis Blume | | Rubiaceae |
| Sprucea Benth. | Simira Aubl. | | | Sprucea Benth. | Simira Aubl. | Rubiaceae |
| Squamellaria Becc. | | a | | Squamellaria Becc. | | Rubiaceae |
| Staelia Cham. & Schltdl. | | a | | Staelia Cham. & Schltdl. | | Rubiaceae |
| Stachyarrhena Hook. f. | | a | | Stachyarrhena Hook. f. | | Rubiaceae |
| Stachyococcus Standl. | | a | | Stachyococcus Standl. | | Rubiaceae |
| Standleya Brade | | a | | Standleya Brade | | Rubiaceae |
| Stannia H. Karst. | Posoqueria Aubl. | | | Stannia H. Karst. | Posoqueria Aubl. | Rubiaceae |
| Staurospermum Thonn. | Mitracarpus Zucc. | | | Staurospermum Thonn. | Mitracarpus Zucc. | Rubiaceae |
| Steenisia Bakh. f. | | a | | Steenisia Bakh. f. | | Rubiaceae |
| Stelechantha Bremek. | | a | | Stelechantha Bremek. | | Rubiaceae |
| Stellix Noronha | Psychotria L. | | | Stellix Noronha | Psychotria L. | Rubiaceae |
| Stelmanis Raf., nom. inval. | Hedyotis L. | | | Stelmanis Raf., nom. inval. | Hedyotis L. | Rubiaceae |
| Stelmotis Raf. | Hedyotis L. | | | Stelmotis Raf. | Hedyotis L. | Rubiaceae |
| Stenaria (Raf.) Terrell | | a | | Stenaria (Raf.) Terrell | | Rubiaceae |
| Stenosepala C. H. Perss. | | a | | Stenosepala C. H. Perss. | | Rubiaceae |
| Stenostomum C. F. Gaertn. | | a | | Stenostomum C. F. Gaertn. | | Rubiaceae |
| Stenotis Terrell | | a | | Stenotis Terrell | | Rubiaceae |
| Stephanium Schreb. | Palicourea Aubl. | | | Stephanium Schreb. | Palicourea Aubl. | Rubiaceae |
| Stephanococcus Bremek. | | a | | Stephanococcus Bremek. | | Rubiaceae |
| Stephegyne Korth. | Mitragyna Korth. | | | Stephegyne Korth. | Mitragyna Korth. | Rubiaceae |
| Steudelago Kuntze | Exostema (Pers.) Humb. & Bonpl. | | | Steudelago Kuntze | Exostema (Pers.) Humb. & Bonpl. | Rubiaceae |
| Stevensia Poit. | | a | | Stevensia Poit. | | Rubiaceae |
| Steyermarkia Standl. | | a | | Steyermarkia Standl. | | Rubiaceae |
| Stigmanthus Lour. | Gynochthodes Blume | | | Stigmanthus Lour. | Gynochthodes Blume | Rubiaceae |
| Stigmatanthus Schult. | Morinda L. | | | Stigmatanthus Schult. | Morinda L. | Rubiaceae |
| Stichianthus Valeton | | a | | Stichianthus Valeton | | Rubiaceae |
| Stilpnophyllum Hook. f. | | a | | Stilpnophyllum Hook. f. | | Rubiaceae |
| Stipularia P. Beauv. | | a | | Stipularia P. Beauv. | | Rubiaceae |
| Stomandra Standl. | Rustia Klotzsch | | | Stomandra Standl. | Rustia Klotzsch | Rubiaceae |
| Straussia A. Gray | Psychotria L. | | | Straussia A. Gray | Psychotria L. | Rubiaceae |
| Streblosa Korth. | | a | | Streblosa Korth. | | Rubiaceae |
| Streblosiopsis Valeton | | a | | Streblosiopsis Valeton | | Rubiaceae |
| Strempelia A. Rich. ex DC. | | a | | Strempelia A. Rich. ex DC. | | Rubiaceae |
| Striolaria Ducke | Pentagonia Benth. | | | Striolaria Ducke | Pentagonia Benth. | Rubiaceae |
| Strumpfia Jacq. | | a | | Strumpfia Jacq. | | Rubiaceae |
| Sturmia C. F. Gaertn. | Antirhea Comm. ex Juss. | | | Sturmia C. F. Gaertn. | Antirhea Comm. ex Juss. | Rubiaceae |
| Stylocoryna Cav. | Aidia Lour. | | | Stylocoryna Cav. | Aidia Lour. | Rubiaceae |
| Stylocoryne Wight & Arn., orth. var. | Aidia Lour. | | | Stylocoryne Wight & Arn., orth. var. | Aidia Lour. | Rubiaceae |
| Stylosiphonia Brandegee | | a | | Stylosiphonia Brandegee | | Rubiaceae |
| Suberanthus Borhidi & M. Fernández | | a | | Suberanthus Borhidi & M. Fernández | | Rubiaceae |
| Sukunia A. C. Sm. | | a | | Sukunia A. C. Sm. | | Rubiaceae |
| Sulipa Blanco | Gardenia J. Ellis | | | Sulipa Blanco | Gardenia J. Ellis | Rubiaceae |
| Sulitia Merr. | | a | | Sulitia Merr. | | Rubiaceae |
| Sulzeria Roem. & Schult., nom. inval. | Faramea Aubl. | | | Sulzeria Roem. & Schult., nom. inval. | Faramea Aubl. | Rubiaceae |
| Suteria DC. | Psychotria L. | | | Suteria DC. | Psychotria L. | Rubiaceae |
| Sykesia Arn. | Gaertnera Lam. | | | Sykesia Arn. | Gaertnera Lam. | Rubiaceae |
| Symphyllarion Gagnep. | Hedyotis L. | | | Symphyllarion Gagnep. | Hedyotis L. | Rubiaceae |
| Synaptantha Hook. f. | | a | | Synaptantha Hook. f. | | Rubiaceae |
| Synisoon Baill. | Retiniphyllum Humb. & Bonpl. | | | Synisoon Baill. | Retiniphyllum Humb. & Bonpl. | Rubiaceae |
| Syringantha Standl. | | a | | Syringantha Standl. | | Rubiaceae |
| Tamatavia Hook. f. | Chapelieria A. Rich. ex DC. | | | Tamatavia Hook. f. | Chapelieria A. Rich. ex DC. | Rubiaceae |
| Tamilnadia Tirveng. & Sastre | | a | | Tamilnadia Tirveng. & Sastre | | Rubiaceae |
| Tammsia H. Karst. | | a | | Tammsia H. Karst. | | Rubiaceae |
| Tamridaea Thulin & B. Bremer | | a | | Tamridaea Thulin & B. Bremer | | Rubiaceae |
| Tangaraca Adans. | Hamelia Jacq. | | | Tangaraca Adans. | Hamelia Jacq. | Rubiaceae |
| Tangshuia S. S. Ying | | a | | Tangshuia S. S. Ying | | Rubiaceae |
| Tapinopentas Bremek. | Otomeria Benth. | | | Tapinopentas Bremek. | Otomeria Benth. | Rubiaceae |
| Tapiphyllum Robyns | Vangueria Juss. | | | Tapiphyllum Robyns | Vangueria Juss. | Rubiaceae |
| Tapogomea Aubl. | Psychotria L. | | | Tapogomea Aubl. | Psychotria L. | Rubiaceae |
| Taramea Raf., orth. var. | Faramea Aubl. | | | Taramea Raf., orth. var. | Faramea Aubl. | Rubiaceae |
| Tardavel Adans. | Spermacoce L. | | | Tardavel Adans. | Spermacoce L. | Rubiaceae |
| Tarenna Gaertn. | | a | | Tarenna Gaertn. | | Rubiaceae |
| Tarennoidea Tirveng. & Sastre | | a | | Tarennoidea Tirveng. & Sastre | | Rubiaceae |
| Tatea Seem. | Bikkia Reinw. | | | Tatea Seem. | Bikkia Reinw. | Rubiaceae |
| Teinosolen Hook. f. | Heterophyllaea Hook. f. | | | Teinosolen Hook. f. | Heterophyllaea Hook. f. | Rubiaceae |
| Temnocalyx Robyns | | a | | Temnocalyx Robyns | | Rubiaceae |
| Temnopteryx Hook. f. | | a | | Temnopteryx Hook. f. | | Rubiaceae |
| Tennantia Verdc. | | a | | Tennantia Verdc. | | Rubiaceae |
| Tepesia C. F. Gaertn. | Hamelia Jacq. | | | Tepesia C. F. Gaertn. | Hamelia Jacq. | Rubiaceae |
| Terebraria Sessé ex Kunth | Neolaugeria Nicolson | | | Terebraria Sessé ex Kunth | Neolaugeria Nicolson | Rubiaceae |
| Tertrea DC. | Machaonia Humb. & Bonpl. | | | Tertrea DC. | Machaonia Humb. & Bonpl. | Rubiaceae |
| Tessiera DC. | Spermacoce L. | | | Tessiera DC. | Spermacoce L. | Rubiaceae |
| Tetralopha Hook. f. | Gynochthodes Blume | | | Tetralopha Hook. f. | Gynochthodes Blume | Rubiaceae |
| Tetramerium C. F. Gaertn. | Faramea Aubl. | | | Tetramerium C. F. Gaertn. | Faramea Aubl. | Rubiaceae |
| Tetraplasia Rehder | Damnacanthus C. F. Gaertn. | | | Tetraplasia Rehder | Damnacanthus C. F. Gaertn. | Rubiaceae |
| Tetrastigma K. Schum. | Schumanniophyton Harms | | | Tetrastigma K. Schum. | Schumanniophyton Harms | Rubiaceae |
| Thamnoldenlandia Groeninckx | | a | | Thamnoldenlandia Groeninckx | | Rubiaceae |
| Thecagonum Babu | Oldenlandia L. | | | Thecagonum Babu | Oldenlandia L. | Rubiaceae |
| Thecorchus Bremek. | Oldenlandia L. | | | Thecorchus Bremek. | Oldenlandia L. | Rubiaceae |
| Theligonum L. | | a | | Theligonum L. | | Rubiaceae |
| Theyodis A. Rich. | Oldenlandia L. | | | Theyodis A. Rich. | Oldenlandia L. | Rubiaceae |
| Thieleodoxa Cham. | Alibertia A. Rich. ex DC. | | | Thieleodoxa Cham. | Alibertia A. Rich. ex DC. | Rubiaceae |
| Thiersia Baill. | Faramea Aubl. | | | Thiersia Baill. | Faramea Aubl. | Rubiaceae |
| Thiollierea Montrouz. | Bikkia Reinw. | | | Thiollierea Montrouz. | Bikkia Reinw. | Rubiaceae |
| Thogsennia Aiello | | a | | Thogsennia Aiello | | Rubiaceae |
| Thouarsiora Homolle ex Arènes | Ixora L. | | | Thouarsiora Homolle ex Arènes | Ixora L. | Rubiaceae |
| Thunbergia Montin | Gardenia J. Ellis | | | Thunbergia Montin | Gardenia J. Ellis | Rubiaceae |
| Thyridocalyx Bremek. | Triainolepis Hook. f. | | | Thyridocalyx Bremek. | Triainolepis Hook. f. | Rubiaceae |
| Thysanospermum Champ. ex Benth. | Coptosapelta Korth. | | | Thysanospermum Champ. ex Benth. | Coptosapelta Korth. | Rubiaceae |
| Timonius DC. | | a | | Timonius DC. | | Rubiaceae |
| Tobagoa Urb. | | a | | Tobagoa Urb. | | Rubiaceae |
| Tocoyena Aubl. | | a | | Tocoyena Aubl. | | Rubiaceae |
| Tontanea Aubl. | Coccocypselum P. Browne | | | Tontanea Aubl. | Coccocypselum P. Browne | Rubiaceae |
| Tortuella Urb. | | a | | Tortuella Urb. | | Rubiaceae |
| Tournefortiopsis Rusby | Guettarda L. | | | Tournefortiopsis Rusby | Guettarda L. | Rubiaceae |
| Trailliaedoxa W. W. Sm. & Forrest | | a | | Trailliaedoxa W. W. Sm. & Forrest | | Rubiaceae |
| Tresanthera H. Karst. | | a | | Tresanthera H. Karst. | | Rubiaceae |
| Trevirania Heynh. | Psychotria L. | | | Trevirania Heynh. | Psychotria L. | Rubiaceae |
| Triainolepis Hook. f. | | a | | Triainolepis Hook. f. | | Rubiaceae |
| Tribrachya Korth. | Rennellia Korth. | | | Tribrachya Korth. | Rennellia Korth. | Rubiaceae |
| Tricalysia A. Rich. ex DC. | | a | | Tricalysia A. Rich. ex DC. | | Rubiaceae |
| Trigonopyren Bremek. | | a | | Trigonopyren Bremek. | | Rubiaceae |
| Trichogalium Fourr. | Galium L. | | | Trichogalium Fourr. | Galium L. | Rubiaceae |
| Trichostachys Hook. f. | | a | | Trichostachys Hook. f. | | Rubiaceae |
| Triodon DC. | Diodia Gronov. | | | Triodon DC. | Diodia Gronov. | Rubiaceae |
| Trisciadia Hook. f. | Coelospermum Blume | | | Trisciadia Hook. f. | Coelospermum Blume | Rubiaceae |
| Trukia Kaneh. | Atractocarpus Schltr. & K. Krause | | | Trukia Kaneh. | Atractocarpus Schltr. & K. Krause | Rubiaceae |
| Tsiangia But et al. | Ixora L. | | | Tsiangia But et al. | Ixora L. | Rubiaceae |
| Ucriana Willd. | Tocoyena Aubl. | | | Ucriana Willd. | Tocoyena Aubl. | Rubiaceae |
| Uncaria Schreb. | | a | | Uncaria Schreb. | | Rubiaceae |
| Uncariopsis H. Karst. | Schradera Vahl | | | Uncariopsis H. Karst. | Schradera Vahl | Rubiaceae |
| Uncinaria Rchb., orth. var. | Uncaria Schreb. | | | Uncinaria Rchb., orth. var. | Uncaria Schreb. | Rubiaceae |
| Uragoga L. | Psychotria L. | | | Uragoga L. | Psychotria L. | Rubiaceae |
| Urceolaria Willd. ex Cothen. | Schradera Vahl | | | Urceolaria Willd. ex Cothen. | Schradera Vahl | Rubiaceae |
| Urophyllum Wall. | | a | | Urophyllum Wall. | | Rubiaceae |
| Uruparia Raf. | Uncaria Schreb. | | | Uruparia Raf. | Uncaria Schreb. | Rubiaceae |
| Vaillantia Hoffm., orth. var. | Valantia L. | | | Vaillantia Hoffm., orth. var. | Valantia L. | Rubiaceae |
| Valantia L. | | a | | Valantia L. | | Rubiaceae |
| Vanessa Raf. | Manettia Mutis | | | Vanessa Raf. | Manettia Mutis | Rubiaceae |
| Vangueria Juss. | | a | | Vangueria Juss. | | Rubiaceae |
| Vangueriella Verdc. | | a | | Vangueriella Verdc. | | Rubiaceae |
| Vangueriopsis Robyns | | a | | Vangueriopsis Robyns | | Rubiaceae |
| Varneria L., nom. inval. | Gardenia J. Ellis | | | Varneria L., nom. inval. | Gardenia J. Ellis | Rubiaceae |
| Vavanga Rohr, nom. inval. | Vangueria Juss. | | | Vavanga Rohr, nom. inval. | Vangueria Juss. | Rubiaceae |
| Versteegia Valeton | | a | | Versteegia Valeton | | Rubiaceae |
| Verulamia DC. ex Poir. | Pavetta L. | | | Verulamia DC. ex Poir. | Pavetta L. | Rubiaceae |
| Vignaldia A. Rich. | Pentas Benth. | | | Vignaldia A. Rich. | Pentas Benth. | Rubiaceae |
| Vignaudia Schweinf., orth. var. | Pentas Benth. | | | Vignaudia Schweinf., orth. var. | Pentas Benth. | Rubiaceae |
| Villaria Rolfe | | a | | Villaria Rolfe | | Rubiaceae |
| Virecta Sm. | Virectaria Bremek. | | | Virecta Sm. | Virectaria Bremek. | Rubiaceae |
| Virecta L. f. | Sipanea Aubl. | | | Virecta L. f. | Sipanea Aubl. | Rubiaceae |
| Virectaria Bremek. | | a | | Virectaria Bremek. | | Rubiaceae |
| Viscoides Jacq. | Psychotria L. | | | Viscoides Jacq. | Psychotria L. | Rubiaceae |
| Vissadali Adans. | Knoxia L. | | | Vissadali Adans. | Knoxia L. | Rubiaceae |
| Viviania Colla | Melanopsidium Colla | | | Viviania Colla | Melanopsidium Colla | Rubiaceae |
| Viviania Raf. | Guettarda L. | | | Viviania Raf. | Guettarda L. | Rubiaceae |
| Voigtia Klotzsch | Bathysa C. Presl | | | Voigtia Klotzsch | Bathysa C. Presl | Rubiaceae |
| Wahlenbergia Blume | Tarenna Gaertn. | | | Wahlenbergia Blume | Tarenna Gaertn. | Rubiaceae |
| Wallichia Reinw. ex Blume | Urophyllum Wall. | | | Wallichia Reinw. ex Blume | Urophyllum Wall. | Rubiaceae |
| Wandersong David W. Taylor | | a | | Wandersong David W. Taylor | | Rubiaceae |
| Warburgina Eig | | a | | Warburgina Eig | | Rubiaceae |
| Warneria L., nom. inval. | Gardenia J. Ellis | | | Warneria L., nom. inval. | Gardenia J. Ellis | Rubiaceae |
| Warszewiczia Klotzsch | | a | | Warszewiczia Klotzsch | | Rubiaceae |
| Watsonamra Kuntze | Pentagonia Benth. | | | Watsonamra Kuntze | Pentagonia Benth. | Rubiaceae |
| Webera Schreb. | Tarenna Gaertn. | | | Webera Schreb. | Tarenna Gaertn. | Rubiaceae |
| Wendlandia Bartl. ex DC. | | a | | Wendlandia Bartl. ex DC. | | Rubiaceae |
| Wernhamia S. Moore | Simira Aubl. | | | Wernhamia S. Moore | Simira Aubl. | Rubiaceae |
| Wiasemskya Klotzsch | Tammsia H. Karst. | | | Wiasemskya Klotzsch | Tammsia H. Karst. | Rubiaceae |
| Wiegmannia Meyen | Kadua Cham. & Schltdl. | | | Wiegmannia Meyen | Kadua Cham. & Schltdl. | Rubiaceae |
| Wigmannia Walp., orth. var. | Hedyotis L. | | | Wigmannia Walp., orth. var. | Hedyotis L. | Rubiaceae |
| Willdenovia J. F. Gmel. | Rondeletia L. | | | Willdenovia J. F. Gmel. | Rondeletia L. | Rubiaceae |
| Williamsia Merr. | Praravinia Korth. | | | Williamsia Merr. | Praravinia Korth. | Rubiaceae |
| Wittmackanthus Kuntze | | a | | Wittmackanthus Kuntze | | Rubiaceae |
| Wittmannia Vahl | Vangueria Juss. | | | Wittmannia Vahl | Vangueria Juss. | Rubiaceae |
| Xanthophytopsis Pit. | Xanthophytum Reinw. ex Blume | | | Xanthophytopsis Pit. | Xanthophytum Reinw. ex Blume | Rubiaceae |
| Xanthophytum Reinw. ex Blume | | a | | Xanthophytum Reinw. ex Blume | | Rubiaceae |
| Xantonnea Pierre ex Pit. | | a | | Xantonnea Pierre ex Pit. | | Rubiaceae |
| Xantonneopsis Pit. | | a | | Xantonneopsis Pit. | | Rubiaceae |
| Xerococcus Oerst. | | a | | Xerococcus Oerst. | | Rubiaceae |
| Xeromphis Raf. | Catunaregam Wolf | | | Xeromphis Raf. | Catunaregam Wolf | Rubiaceae |
| Yangapa Raf. | Gardenia J. Ellis | | | Yangapa Raf. | Gardenia J. Ellis | Rubiaceae |
| Yutajea Steyerm. | | a | | Yutajea Steyerm. | | Rubiaceae |
| Zalmaria Raf. | Rondeletia L. | | | Zalmaria Raf. | Rondeletia L. | Rubiaceae |
| Zeuxanthe Ridl. | Prismatomeris Thwaites | | | Zeuxanthe Ridl. | Prismatomeris Thwaites | Rubiaceae |
| Zuccarinia Blume | | a | | Zuccarinia Blume | | Rubiaceae |
| Zwaardekronia Korth. | Psychotria L. | | | Zwaardekronia Korth. | Psychotria L. | Rubiaceae |
| Zygoon Hiern | Tarenna Gaertn. | | | Zygoon Hiern | Tarenna Gaertn. | Rubiaceae |