R. johnstoneanum 'Demi-John'
Species selection of R. johnstoneanum
| Selected By | Unknown |
| Subgenus | Rhododendron |
| Section | Rhododendron |
| Subsection | Maddenia |
| 10 Year Height | ? |
| Bloom Time | ? |
| Flower | ? |
| Predominant Colour | ? |
| Leaves | ? |
| Winter Foliage | ? |
| Hardiness | ? |
| Selected By | Unknown |
| Subgenus | Rhododendron |
| Section | Rhododendron |
| Subsection | Maddenia |
| 10 Year Height | ? |
| Bloom Time | ? |
| Flower | ? |
| Predominant Colour | ? |
| Leaves | ? |
| Winter Foliage | ? |
| Hardiness | ? |