Accepted By:
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Hartman, R. L. & B. E. Nelson. 1998. Novelties from North America north of Mexico: A 20-Year Vascular plant Diversity Baseline. 1–51 (mss.).
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Heil, K. D. & S. Brack. 1988. The cacti of Big Bend National Park. Cact. Succ. J. (Los Angeles) 60: 17–34.
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