| 1 | Corolla less than 20 mm long |
| 1' | Corolla more than 20 mm long |
| 2 | Indumentum of the corolla dense, with a layer of longer dendritic hairs above the shorter ones |
| 2' | Indumentum of the corolla sparse to dense, lacking a layer of longer dendritic hairs above the shorter ones |
| 3 | Corolla in the mature bud robust, obtuse, mostly 8-14 mm long |
| 3' | Corolla in the mature bud slender to moderately robust, clavate, acute, mostly 12-24 mm long |
| 4 | Indumentum generally pale-coloured, predominantly cream, less often a greyish or dark ochre; leaf lamina 5-10 cm long; corolla mostly 13-20 mm long |
| 4' | Indumentum very variable in colour from cream to dark reddish brown but predominantly of darker hues; leaf lamina 3-7 cm long; corolla mostly 8-16 mm long... |
