R. calendulaceum 'Colossus'
Species selection of R. calendulaceum
| Selected By | Leach, Dr. David G. |
| Introduced | 1953 |
| 10 Year Height | 100 cm. (3ft.) |
| Bloom Time | late midseason |
| Flower | tubular funnel-shaped |
| Flower Color | ? |
| Fragrance | ? |
| Leaves | narrowly elliptic |
| Leaf persistence | ? |
| Plant Hardiness | ? |
| Flower Bud Hardiness |
? |
| Registration | Unknown or not recorded |