Accepted By:
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Bailey, L.H. & E.Z. Bailey. 1976. Hortus Third i–xiv, 1–1290. MacMillan, New York.
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Hultén, O. E. G. 1968. Flora of Alaska and neighboring territories. i–1008. In Fl. Alaska. Stanford University Press, Stanford.
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Munz, P. A. & D. D. Keck. 1959. Cal. Fl. 1–1681. University of California Press, Berkeley.
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Welsh, S. L. 1974. Anderson's Fl. Alaska Adj. Parts Canada i–xvi, 1–724. Brigham Young University Press, Provo.
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