Ex situ collections:
| Botanical name | Common name | Variety name / Accession name | Accession number | Part of the MLS |
|---|---|---|---|---|
| Rhododendron ambiguum HEMSL. | Rhododendron | - | 100007 | - |
| Rhododendron ambiguum HEMSL. | Rhododendron | - | 100549 | - |
| Rhododendron ambiguum HEMSL. | Rhododendron | - | 100077 | - |
| Rhododendron ambiguum HEMSL. | Rhododendron | - | 100626 | - |
| Rhododendron ambiguum HEMSL. | Rhododendron | - | 100582 | - |
| Rhododendron amesiae REHD.& WILS. | Rhododendron | - | 100009 | - |
| Rhododendron annae FRANCH. | Rhododendron | - | 100794 | - |
| Rhododendron annae FRANCH. | Rhododendron | - | 100760 | - |
| Rhododendron anthopogon ssp. hypenanthum BALF. F. & CULLEN | Rhododendron | - | 100947 | - |
| Rhododendron anwheiense E.H. WILSON | Rhododendron | - | 100282 | - |