Ex situ collections:
| Botanical name | Common name | Variety name / Accession name | Accession number | Part of the MLS |
|---|---|---|---|---|
| Rhododendron adenopodum FRANCH. | Rhododendron | - | 100253 | - |
| Rhododendron adenopodum FRANCH. | Rhododendron | - | 100004 | - |
| Rhododendron adenosum DAVIDIAN | Rhododendron | - | 100661 | - |
| Rhododendron adenosum DAVIDIAN | Rhododendron | - | 101114 | - |
| Rhododendron aganniphum var. flavorufum (BALF.F. & FORREST) D.F. CHAMB. | Rhododendron | - | 100830 | - |
| Rhododendron aganniphum var. flavorufum (BALF.F. & FORREST) D.F. CHAMB. | Rhododendron | - | 101064 | - |
| Rhododendron albertsenianum FORR. | Rhododendron | - | 101088 | - |
| Rhododendron albiflorum HOOK. | Rhododendron | - | 101077 | - |
| Rhododendron albrechtii (LINDL.) MAXIM. | Rhododendron | - | 100560 | - |
| Rhododendron albrechtii (LINDL.) MAXIM. | Rhododendron | - | 100090 | - |