Majure, Lucas C. 2022. “On the Origin of the Two Putative Allopolyploids, Opuntia Curvispina and O. Martiniana (Cactaceae): A Case of Cryptic Speciation in Prickly Pear Cacti”. Journal of the Botanical Research Institute of Texas 16 (1):317-33. https://doi.org/10.17348/jbrit.v16.i1.1235.