| 1 | Inflorescences glabrous |
| 1' | Inflorescences hairy. |
| 2 | Leaf-base mostly 3-nerved. Inflorescences 0.5-1.5(-2.5) cm broad. Stamens 9—10(—14), free for most of their length |
| 2' | Leaf-base mostly 5-7-nerved. Inflorescences 1.5-5 cm broad. Stamens about 20-40, connate |
