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{{Inc|
Ageratum houstonianum, Mill. (A. mexicanum, Sims.) Involucral scales lance-linear, attenuate, entire, ciliate, the back finely, dense and somewhat viscidly hairy lvs. usually heart-shaped at base: heads slightly larger than in the last. Mex. B.M. 2524.—The better species and more frequent in cult.
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__NOTOC__{{Plantbox
__NOTOC__{{Plantbox
| name = ''Ageratum houstonianum''
| name = ''Ageratum houstonianum''
