Majure, L. C., Köhler, M., & Font, F. (2020).

North American Opuntias (Cactaceae) in Argentina? Remarks on the phylogenetic position of Opuntia penicilligera and a closer look at O. ventanensis

. Phytotaxa, 428(3), 279–289. https://doi.org/10.11646/phytotaxa.428.3.9