| 1 | Single-stemmed (recorded on field label) |
| 1' | Leaves subverticillate |
| 1'' | Leaves very narrow, 10-20 by ½-1½ cm |
| 1''' | Leaves entirely glabrous |
| 1'''' | Leaf lower surface without distinct papillae |
| 1''''' | Leaf lower surface with papillae in distinct groups |
| 1'''''' | Inflorescences (at least in part) cauliflorous |
| 1''''''' | Flower-buds longer than wide |
| 1'''''''' | Petals glabrous outside |
| 1''''''''' | Petals valvate |
| 1'''''''''' | Petals densely hairy (sericeous or villous) outside |
| 1''''''''''' | Hypocarp wider than long (cupular to discoid) |
