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1b. Ageratina altissima (Linnaeus) R. M. King & H. Robinson var. roanensis (Small) Clewell & Wooten, Brittonia. 23: 138. 1971.
Appalachian white snakeroot
Eupatorium roanense Small, Man. S.E. Fl., 1326. 1933 (as roanensis); E. rugosum Houttuyn var. roanense (Small) Fernald
Phyllaries 4–7 mm, apices cuspidate to acuminate.
Flowering Jul–Oct. Moist forests, northern red oak, oak-chestnut, cove forests; 700–1500 m; Ala., Ga., Ky., N.C., S.C., Tenn., Va., W.Va.
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