Accepted By:
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Correll, D. S. & M. C. Johnston. 1970. Man. Vasc. Pl. Texas i–xv, 1–1881. The University of Texas at Dallas, Richardson.
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Great Plains Flora Association. 1986. Fl. Great Plains i–vii, 1–1392. University Press of Kansas, Lawrence.
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Shreve, F. & I. L. Wiggins. 1964. Veg. Fl. Sonoran Desert 2 vols. Stanford University Press, Stanford.
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