Ex situ collections:
| Botanical name | Common name | Variety name / Accession name | Accession number | Part of the MLS |
|---|---|---|---|---|
| Rhododendron anwheiense E.H. WILSON | Rhododendron | - | 100055 | - |
| Rhododendron anwheiense E.H. WILSON | Rhododendron | - | 100282 | - |
| Rhododendron anwheiense E.H. WILSON | Rhododendron | - | 100858 | - |
| Rhododendron anwheiense E.H. WILSON | Rhododendron | - | 101058 | - |
| Rhododendron aperantum BALF.F. & KINGDON-WARD | Rhododendron | - | 100936 | - |
| Rhododendron arborescens (PURSH) TORREY | Rhododendron | - | 101044 | - |
| Rhododendron arboreum ssp. arboreum | Rhododendron | - | 100463 | - |
| Rhododendron arboreum ssp. cinnamomeum (LINDL.) TAGG | Rhododendron | - | 100030 | - |
| Rhododendron arboreum ssp. cinnamomeum (LINDL.) TAGG | Rhododendron | - | 100867 | - |
| Rhododendron arboreum ssp. delavayi (FRANCH.) D.F. CHAMB. | Rhododendron | - | 100466 | - |