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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 Acmella

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1 Leaf base truncate or cordate; [s. FL]
1 Leaf base attenuate into a winged petiole; [NC, TN, MO, and se. OK southwards].
  2 Leaves narrowly to broadly ovate; petioles (3-) 5-43 mm long; outer series of phyllaries lanceolate, the apex acuminate; heads radiate
  2 Leaves linear to lanceolate; petioles 2-4.5 mm long; outer series of phyllaries narrowly to broadly ovate, the apex acute; heads radiate or discoid.
    3 Achenes with a well-developed pappus of bristles
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