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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Munz, P. A. & D. D. Keck. 1959. Cal. Fl. 1–1681. University of California Press, Berkeley.
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