R. 'May Day Group'
Rhododendron Cultivar group
| Hybridized By | Williams, A.M., 1932 |
| Seed Parent | R. haematodes ssp haematodes |
| Pollen Parent | R. griersonianum |
| 10 Year Height | ? |
| Bloom Time | ? |
| Flower | ? |
| Predominant Colour | ? |
| Leaves | ? |
| Winter Foliage | ? |
| Hardiness | ? |
| Status | IRRC registered. |