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Key to Ageratum
https://fsus.ncbg.unc.edu/main.php?pg=show-key.php&keyid=40526
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 |