| 1 | Vining shrub to 10 m; flowers distant, borne singly at intervals along rachis of spikes; tepals shortly pubescent on the back, inside a large, dense tuft of long hairs that exceeds the perianth |
| 1' | Herb or shrub to 2 m; flowers densely aggregated at apex of a terminal, head-like, eventually elongated spike; tepals glabrous on the back, inside with a very small tuft of short hairs that is much shorter than the perianth |
| 2 | Leaves green; tepals 4.2-5.0 mm long; apical appendage of filaments well-developed |
| 2' | Leaves bluish-green (glaucous); tepals 2-3 mm long; apical appendage of filaments not well-developed |
