Adanick, P., Drezner, T. D. and Stock, A. D. (2018) “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(1), pp. 141–147. doi: 10.17348/jbrit.v12.i1.925.