Opuntia mesacantha var. sphaerocarpa J.M.Coult. ex Wooton & Standl. in Contr. U.S. Natl. Herb. 19: 446. 1915 Opuntia mesacantha var. sphaerocarpa J.M.Coult. ex Wooton & Standl. in Contr. U.S. Natl. Herb. 19: 446. 1915Taxon for this nameOpuntia mesacantha var. sphaerocarpa J.M.Coult. ex Wooton & Standl.