| 0 | 53129 | 12E0100014 | 'Moravanka' | Rhododendron dichroanthum Diels subsp. scyphocalyx (Balf. f. & Forrest) Cowan | Czechoslovakia | | 3 | 12E0100014 ** |
| 1 | 53209 | 12E0100094 | 'Anton' | Rhododendron catawbiense Michx. | Germany | | 3 | 12E0100094 ** |
| 2 | 53216 | 12E0100101 | 'Bashful' | Rhododendron degronianum Carrière subsp. yakushimanum (Nakai) H. Hara var. yakushimanum (Nakai) Kitam. | United Kingdom | | 3 | 12E0100101 ** |
| 3 | 53221 | 12E0100106 | 'Blue Tit' | Rhododendron impeditum Balf. f. & W. W. Sm. | United Kingdom | | 3 | 12E0100106 ** |
| 4 | 53231 | 12E0100116 | 'Delta' | Rhododendron hybr. | Germany | | 3 | 12E0100116 ** |
| 5 | 53235 | 12E0100120 | 'Direktoer E. Hjelm' | Rhododendron fortunei Lindl. subsp. fortunei | Netherlands | | 3 | 12E0100120 ** |
| 6 | 53289 | 12E0100174 | 'Midsummer' | Rhododendron maximum L. | United Kingdom | | 3 | 12E0100174 ** |
| 7 | 53294 | 12E0100179 | 'Lord Fairhaven' | Rhododendron hybr. | United Kingdom | | 3 | 12E0100179 ** |
| 8 | 53316 | 12E0100201 | 'Leopardii' | Rhododendron arboreum Sm. | United Kingdom | | 3 | 12E0100201 ** |
| 9 | 53322 | 12E0100207 | 'Mrs P. den Ouden' | Rhododendron hybr. | Netherlands | | 3 | 12E0100207 ** |
| 10 | 53395 | 12E0100280 | 'Vorwerk Abendsonne' | Rhododendron hybr. | Germany | | 3 | 12E0100280 ** |
| 11 | 53404 | 12E0100289 | 'Papilionaceum' | Rhododendron hybr. | United Kingdom | | 3 | 12E0100289 ** |
| 12 | 53426 | 12E0100311 | 'Rothenburg' | Rhododendron williamsianum Rehder & E. H. Wilson | Germany | | 3 | 12E0100311 ** |
| 13 | 53488 | 12E0100373 | 'Kate Waterer' | Rhododendron catawbiense Michx. | United Kingdom | | 3 | 12E0100373 ** |
| 14 | 53493 | 12E0100378 | 'Claudine' | Rhododendron hybr. | Germany | | 3 | 12E0100378 ** |
| 15 | 53506 | 12E0100391 | 'Blue Tit Magor' | Rhododendron impeditum Balf. f. & W. W. Sm. | United Kingdom | | 3 | 12E0100391 ** |
| 16 | 53538 | 12E0100423 | 'Janet Blair' | Rhododendron hybr. | United States | | 3 | 12E0100423 ** |
| 17 | 53550 | 12E0100435 | 'Silber' | Rhododendron makinoi Tagg ex Nakai | Germany | | 3 | 12E0100435 ** |
| 18 | 53559 | 12E0100444 | 'Pride of Cambridge' | Rhododendron hybr. | unknown | | 3 | 12E0100444 ** |
| 19 | 53677 | 12E0100563 | 'Audia' | Rhododendron impeditum Balf. f. & W. W. Sm. | unknown | | 3 | 12E0100563 ** |
| 20 | 53680 | 12E0100566 | 'Charles Bagley' | Rhododendron catawbiense Michx. | United Kingdom | | 3 | 12E0100566 ** |
| 21 | 53684 | 12E0100603 | 'Doubrava' | Rhododendron obtusum (Lindl.) Planch. | Czechoslovakia | | 3 | 12E0100603 ** |
| 22 | 53685 | 12E0100604 | 'Profesor Jersov' | Rhododendron obtusum (Lindl.) Planch. | Czechoslovakia | | 3 | 12E0100604 ** |
| 23 | 53686 | 12E0100605 | 'Labe' | Rhododendron obtusum (Lindl.) Planch. | Czechoslovakia | | 3 | 12E0100605 ** |
| 24 | 53714 | 12E0100818 | 'Monsieur Marcel Menard' | Rhododendron hybr. | France | | 3 | 12E0100818 ** |
| 25 | 65863 | 12E0100891 | 'Mrs Philip Martineau' | Rhododendron hybr. | England, United Kingdom | | 3 | 12E0100891 ** |