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 Corolla white
..2 Corolla 2-3.5 mm long; fruits < 3 mm long
..2 Corolla 5-7 mm long; fruits > 3 mm long