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 Leaves flattened (the leaflets all borne in one plane), 2-pinnate (and the pinnules pinnatifid) in the lower blade
1 Leaves prominently 3-dimensional, 2-pinnate in the lower blade, 1-pinnate in the upper blade