Accepted By:
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Abrams, L.R. & R. S. Ferris. 1960. Bignonias to Sunflowers. 4: 732 pp. In L.R. Abrams (ed.) Ill. Fl. Pacific States. Stanford University Press, Stanford.
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Flora of North America Editorial Committee, e. 2006. Magnoliophyta: Asteridae, part 6: Asteraceae, part 1. 19: i–xxiv, 1–579. In Fl. N. Amer.. Oxford University Press, New York.
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