Click the number at the start of a key lead to highlight both that lead and its corresponding lead. Click again to show only the two highlighted leads. Click a third time to return to the full key with the selected leads still highlighted.
| 1 Flowers sessile or subsessile; capsule circumscissile |
| 1 Flowers pedicelled; capsule opening longitudinally. |
| ..2 Flowers borne on a scape, with cymose branching |
| ..2 Flowers solitary or in racemes |