| 20534 | Iva axillaris Pursh | | | a | | Iva axillaris Pursh | |
| 20535 | Iva ciliata Willd. | Iva annua L. | 104368 | | | Iva ciliata Willd. | Iva annua L. |
| 20536 | Iva xanthiifolia Nutt. | Cyclachaena xanthiifolia (Nutt.) Fresen. | 419636 | | | Iva xanthiifolia Nutt. | Cyclachaena xanthiifolia (Nutt.) Fresen. |
| 70389 | Iva imbricata Walter | | | a | | Iva imbricata Walter | |
| 104368 | Iva annua L. | | | a | | Iva annua L. | |
| 104369 | Iva frutescens Pursh var. oraria (Bartlett) Fernald & Griscom | Iva frutescens L. | 456410 | | i | Iva frutescens Pursh var.oraria (Bartlett) Fernald & Griscom | Iva frutescens L. |
| 403988 | Iva spp. | | | a | | Iva spp. | |
| 410056 | Iva acerosa (Nutt.) R. C. Jacks. | Oxytenia acerosa Nutt. | 410057 | | | Iva acerosa (Nutt.) R. C. Jacks. | Oxytenia acerosa Nutt. |
| 413853 | Iva ambrosiifolia (A. Gray) A. Gray | Hedosyne ambrosiifolia (A. Gray) Strother | 419634 | | | Iva ambrosiifolia (A. Gray) A. Gray | Hedosyne ambrosiifolia (A. Gray) Strother |
| 413855 | Iva ambrosiifolia (A. Gray) A. Gray var. lobata (Rydb.) B. L. Turner | Hedosyne ambrosiifolia (A. Gray) Strother | 419634 | | i | Iva ambrosiifolia (A. Gray) A. Gray var.lobata (Rydb.) B. L. Turner | Hedosyne ambrosiifolia (A. Gray) Strother |
| 454830 | Iva angustifolia Nutt. ex DC. | | | a | | Iva angustifolia Nutt. ex DC. | |
| 456410 | Iva frutescens L. | | | a | | Iva frutescens L. | |
| 456411 | Iva oraria Bartlett | Iva frutescens L. | 456410 | | | Iva oraria Bartlett | Iva frutescens L. |
| 456413 | Iva nevadensis M. E. Jones | Chorisiva nevadensis (M. E. Jones) Rydb. | 456412 | | | Iva nevadensis M. E. Jones | Chorisiva nevadensis (M. E. Jones) Rydb. |
| 476218 | Iva hayesiana A. Gray | | | a | | Iva hayesiana A. Gray | |
| 488346 | Iva axillaris Pursh var. robustior Hook. | Iva axillaris Pursh | 20534 | | i | Iva axillaris Pursh var.robustior Hook. | Iva axillaris Pursh |
| 488347 | Iva axillaris Pursh var. axillaris | Iva axillaris Pursh | 20534 | | i | Iva axillaris Pursh var.axillaris | Iva axillaris Pursh |
| 488348 | Iva axillaris Pursh subsp. robustior (Hook.) Bassett | Iva axillaris Pursh | 20534 | | i | Iva axillaris Pursh subsp. robustior (Hook.) Bassett | Iva axillaris Pursh |
| 488349 | Iva axillaris Pursh subsp. axillaris | Iva axillaris Pursh | 20534 | | i | Iva axillaris Pursh subsp. axillaris | Iva axillaris Pursh |
| 491502 | Iva ambrosiifolia (A. Gray) A. Gray var. ambrosiifolia | Hedosyne ambrosiifolia (A. Gray) Strother | 419634 | | i | Iva ambrosiifolia (A. Gray) A. Gray var.ambrosiifolia | Hedosyne ambrosiifolia (A. Gray) Strother |
| 491503 | Iva frutescens L. var. frutescens | Iva frutescens L. | 456410 | | i | Iva frutescens L. var.frutescens | Iva frutescens L. |