Kentucky Plant Atlas




Taxonomic distinction unclear    No county information
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Asteraceae <Eupatorieae> Ageratina [Eupatorium] altissima var. roanensis (E. rugosum var. r.)
Ageratina altissima (L.) King & H.E. Robins. var. roanensis (Small) Clewell & Woot.
ALI: no HAB: n/a, n/a, n/a, n/a ABU: n/a, n/a, 0
This occurs mostly in the Blue Ridge Mts, and Clewell & Wooten (1971) noted: "grading into var. altissima at lower elevations and in peripheral geographic areas." A coll. from HARL (widely distributed, with a duplicate at MDKY) has been assigned to this variety by Clewell & Wooten: F.T. McFarland #29, 28 Sep 1940, Black Mt. top, common in woods. Also, a coll. of T.H. Kearney from BELL (NCU) has been labeled with this name. These plants do not seem to be as distinct as var. roanensis in the Blue Ridge (M). True roanensis differs from typical altissima (W) in its longer, more acuminate phyllaries (5-7 mm versus 3-5 mm), larger heads (mostly with 20-34 flowers versus 12-25), and broader leaf-bases (truncate to subcordate versus broadly cuneate).