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Cylindropuntia wolfii in J. Arizona-Nevada Acad. Sci. 332: 150. 2001
is new combination for Opuntia echinocarpa var. wolfii in Cact. Succ. J. (Los Angeles) 41: 33. 1969
Cylindropuntia wolfii in J. Arizona-Nevada Acad. Sci. 332: 150. 2001