| 0 | 53123 | 12E0100008 | 'Humoreska' | Rhododendron hybr. | Czechoslovakia | | 4 | 12E0100008 ** |
| 1 | 53134 | 12E0100019 | 'Profesor Jelinek' | Rhododendron smirnowii Trautv. | Czechoslovakia | | 4 | 12E0100019 ** |
| 2 | 53138 | 12E0100023 | 'Vilem Heckel' | Rhododendron hybr. | Czechoslovakia | | 4 | 12E0100023 ** |
| 3 | 53153 | 12E0100038 | 'Catawbiense Grandiflorum' | Rhododendron catawbiense Michx. | United Kingdom | | 4 | 12E0100038 ** |
| 4 | 53157 | 12E0100042 | 'Edward S. Rand' | Rhododendron catawbiense Michx. | United Kingdom | | 4 | 12E0100042 ** |
| 5 | 53159 | 12E0100044 | 'F. D. Godman' | Rhododendron catawbiense Michx. | United Kingdom | | 4 | 12E0100044 ** |
| 6 | 53185 | 12E0100070 | 'Markgraf' | Rhododendron catawbiense Michx. | Germany | | 4 | 12E0100070 ** |
| 7 | 53188 | 12E0100073 | 'Myrte' | Rhododendron hybr. | Germany | | 4 | 12E0100073 ** |
| 8 | 53214 | 12E0100099 | 'Baden Baden' | Rhododendron forrestii Balf. f. ex Diels subsp. forrestii | Germany | | 4 | 12E0100099 ** |
| 9 | 53247 | 12E0100132 | 'Erich' | Rhododendron hybr. | Germany | | 4 | 12E0100132 ** |
| 10 | 53277 | 12E0100162 | 'Humboldt' | Rhododendron catawbiense Michx. | Germany | | 4 | 12E0100162 ** |
| 11 | 53323 | 12E0100208 | 'Nova Zembla' | Rhododendron catawbiense Michx. | Netherlands | | 4 | 12E0100208 ** |
| 12 | 53338 | 12E0100223 | 'Roseum Elegans' | Rhododendron catawbiense Michx. | United Kingdom | | 4 | 12E0100223 ** |
| 13 | 53339 | 12E0100224 | 'Roseum Superbum' | Rhododendron catawbiense Michx. | United Kingdom | | 4 | 12E0100224 ** |
| 14 | 53526 | 12E0100411 | 'Gina Lollobrigida' | Rhododendron hybr. | Netherlands | | 4 | 12E0100411 ** |
| 15 | 53566 | 12E0100451 | 'Roland' | Rhododendron hybr. | United Kingdom | | 4 | 12E0100451 ** |
| 16 | 53655 | 12E0100541 | 'Haruko' | Rhododendron hybr. | unknown | | 4 | 12E0100541 ** |
| 17 | 53688 | 12E0100607 | 'Orlice' | Rhododendron obtusum (Lindl.) Planch. | Czechoslovakia | | 4 | 12E0100607 ** |
| 18 | 53690 | 12E0100609 | 'Otava' | Rhododendron obtusum (Lindl.) Planch. | Czechoslovakia | | 4 | 12E0100609 ** |
| 19 | 53693 | 12E0100612 | 'Ledikanense' | Rhododendron yedoense Maxim. var. poukhanense (H. Lév.) Nakai | Czechoslovakia | | 4 | 12E0100612 ** |
| 20 | 53698 | 12E0100802 | 'Olin O. Dobbs' | Rhododendron hybr. | Oregon, United States | | 4 | 12E0100802 ** |
| 21 | 53707 | 12E0100811 | 'Frank Galsworthy' | Rhododendron ponticum L. | United Kingdom | | 4 | 12E0100811 ** |