tortifolius Nees Gen. Sp. Aster., 10, 148. 1832. John C. Semple, Michelle R. Leonard Common names: White-topped aster Etymology: Greek sericos, silky,
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Nuttall Trans. Amer. Philos. Soc., n. s. 7: 302. 1840. John C. Semple, Michelle R. Leonard Common names: Oregon white-topped aster Endemic Synonyms: Aster o
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subspeciesSericocarpus oregonensis subsp. oregonensis John C. Semple, Michelle R. Leonard Endemic Treatment appears in FNA Volume 20. Treatment on page 104
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(Durand) Ferris Contr. Dudley Herb. 5: 100. 1958. John C. Semple, Michelle R. Leonard Endemic Basionym: Sericocarpus californicus Durand Pl. Pratten. Calif
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Britton Prelim. Cat., 26. 1888. not Britton 1888 John C. Semple, Michelle R. Leonard Common names: Narrow-leaf white-topped aster Endemic Basionym: Conyza
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tortifolius (Michaux) Nees Gen. Sp. Aster., 151. 1832. John C. Semple, Michelle R. Leonard Common names: Dixie white-topped aster Endemic Basionym: Aster tortifolius Michaux
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Lindley in W. J. Hooker, Fl. Bor. Amer. 2: 14. 1834. John C. Semple, Michelle R. Leonard Common names: Columbian white-topped aster Endemic Synonyms: Aster
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asteroides (Linnaeus) Britton Gen. Sp. Aster., 150. 1832. John C. Semple, Michelle R. Leonard Common names: Toothed white-topped aster IllustratedEndemic Basionym:
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