1 | Leaf undersurface hirsutulous. |
1' | Leaf undersurface glabrous or with a few stiff appressed hairs only |
2 | Inflorescence with a distinct peduncle of 0.1-1.2 cm long |
2' | Inflorescence sessile on petioles |
3 | Fertile stamens 5, staminodes absent |
3' | Fertile stamens 3, staminodes 2 |