References
Majure, L.C. 2012. The Evolution and systematics of the Opuntia humifusa complex. Ph.D. Dissertation. Univ. of Florida. Gainesville. Google Scholar
Majure, L.C. 2012. The Evolution and systematics of the Opuntia humifusa complex. Ph.D. Dissertation. Univ. of Florida. Gainesville. Google Scholar