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 Disc florets 8-14; lower cauline leaves deltate; [Lake and Levy counties, FL]
1 Disc florets 18-55; lower cauline leaves hastate to deltate or lanceolate; [NC and TN northwards]