Fenstermacher, J. 2016. Club chollas of the Big Bend 3.0: refining species concepts and distributions for the Corynopuntia [Opuntia, Grusonia] schottii complex of western Texas via new chromosome counts, pollen stainability, and morphologic data. Phytoneuron 2016-1: 1–58. Published 7 January 2016. ISSN 2153 733X
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