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Eupatorium rotundifolium var. rotundifolium, Eupatorium rotundifolium var. scabridum Linnaeus Sp. Pl. 2: 837. 1753. Kunsiri Chaw Siripun, Edward E. Schilling

genusEupatorium speciesEupatorium rotundifolium varietyEupatorium rotundifolium var. scabridum (Elliott) A. Gray in A. Gray et al., Syn. Fl. N. Amer. 1(2): 99. 1884.

preference for wetter habitats. It has been proposed that E. rotundifolium var. scabridum (E. pubescens) represents hybrids between E. semiserratum and E. rotundifolium;