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 |
| Predominant Colour | ? |
| Leaves | narrowly elliptic |
| Winter Foliage | ? |
| Hardiness | ? |