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21c. Eupatorium rotundifolium Linnaeus var. scabridum (Elliott) A. Gray in A. Gray et al., Syn. Fl. N. Amer. 1(2): 99. 1884.
Eupatorium scabridum Elliott, Sketch Bot. S. Carolina 2: 299. 1823
Leaf blades 3-nerved distal to bases, 20–50 × 15–30 mm, broadest near bases, bases broadly cuneate to cuneate, margins serrate. 2n = 20, 30.
Flowering Jul–Aug. Disturbed sites; 10–100+ m; Ala., Ark., Fla., Ga., La., Miss., Mo., Okla., S.C., Tex.
Variety scabridum includes apomictic polyploids and has been suggested to have been derived from hybridization between var. rotundifolium and Eupatorium semiserratum.
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