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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.

Key to Trilisa

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1 Stem densely spreading-pubescent; capitulescence a cylindrical thyrsoid panicle; leaves (0.5-) 1-3 (-4) cm wide
1 Stem glabrous; capitulescence corymbose, the lateral branches equally or overtopping the central ones; leaves 1-6 (-11) cm wide.
..2 Fresh plants with a strong odor of coumarin/vanilla; basal leaves usually > 15 cm long and > 5 cm wide; midstem leaves broadly elliptic, the apex flared away from the stem, the margins often shallowly toothed; inflorescence 1.5-3× as tall as broad, the primary inflorescence branches diverging from the main axis at a 10-20° angle; heads mostly with 7-10 flowers; of c. peninsular FL northwards to se. NC and northwestwards to e. LA]
..2 Fresh plants with very slight or no odor of coumarin/vanilla; basal leaves < 15 cm long and < 4 cm wide; midstem leaves narrowly elliptic, tightly clasping the stem, the margins entire; inflorescence 0.5-1× as tall as broad, the primary inflorescence branches diverging from the main axis at a 30-45° angle; heads mostly with 10-14 flowers; [of c. peninsular FL south to s. FL]
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