Accepted By:
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Abrams, L.R. 1944. Buckwheats to Kramerias. 2: 1–635. In L.R. Abrams (ed.) Ill. Fl. Pacific States. Stanford University Press, Stanford.
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Shreve, F. & I. L. Wiggins. 1964. Veg. Fl. Sonoran Desert 2 vols. Stanford University Press, Stanford.
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