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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 Ageratum

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1 Plants colonial by rhizomes; leaves succulent, fleshy; leaf surfaces glabrous or glabrescent; [native, s. FL]
1 Plants single, fibrous-rooted; leaves herbaceous, not fleshy; leaf surfaces hairy; [exotic, more widespread]
..2 Peduncles with short and long non-glandular hairs; phyllaries glabrous to sparsely pubescent with non-glandular hairs
..2 Peduncles with short and long hairs, many of them glandular; phyllaries stipitate-glandular and sparsely pubescent with non-glandular hairs
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