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Key to Ageratum

Asteraceae

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 hairs, many of them glandular; phyllaries stipitate-glandular and sparsely pubescent with non-glandular hairs