| 1 | Sepals free. Bracts caducous before the flowers are full-grown. |
| 1' | Sepals connate for ¼-¾. Bracts persistent till or after the fruits have fallen. |
| 2 | Style longer than the ovary. Bracts cuspidate |
| 2' | Style much shorter than the ovary. Bracts rounded |
| 3 | Flowers subtended by a bract and a pair of subulate bracteoles. Fruits fully enclosed by the sepals |
| 3' | Bracteoles absent. Apex of fruits not enclosed by the sepals. |
| 4 | Bracts lanceolate, 2-2.5 by 0.5-0.6 mm |
| 4' | Bracts elliptic to obovate, 1.5-2 by 0.8-1.2 mm |
