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.
..2 Calyx persistent in fruit
..2 Calyx deciduous in fruit
....3 Corolla keel with a conic or cylindrical beak
......4 Flowers in terminal spikes, racemes, or corymbs; plants annual or perennial
......4 Flowers axillary; plants perennial