| 1 | Inflorescence subtended by minute, broad and short, persistent basal scale leaves; youngest leaves often recurved, hook-shaped, prehensile |
| 1' | Inflorescence lacking basal scale leaves; youngest leaves neither hook-shaped nor prehensile |
| 2 | Leaf blade mostly < 2x as long as wide, obtuse at base and apex |
| 2' | Leaf blade at least 2x as long as wide, leaf base (and normally also apex) acute |
| 3 | Leaves to 8 cm long, petiole to 1 cm long; triads 3 or 4 pairs |
| 3' | Leaves mostly to 3 cm long, petiole < 0.5 cm long; triads 1(2) pairs |
