Adanick, Paul, Taly Dawn Drezner, and A. Dean Stock. “Stomata Length Is a Reliable Characteristic for Distinguishing Infraspecies and Ploidy Levels of Opuntia Mesacantha (Cactaceae)”. Journal of the Botanical Research Institute of Texas 12, no. 1 (July 20, 2018): 141–147. Accessed May 3, 2024. https://journals.brit.org/jbrit/article/view/925.