A. Dean Stock, Nancy Hussey, Marc D. Beckstrom
Cactus and Succulent Journal 86 (2), 79-83, (4 March 2014) https://doi.org/10.2985/015.086.0201
KEYWORDS: Cactaceae, diploid, dry-fruited prickly pear, Opuntia.
Opuntia diploursina A.D. Stock, N. Hussey & M.D. Beckstrom, sp. nov. is described as a new species of diploid, dry-fruited, prickly pear from the Grapevine Mesa region in south central Mohave Co., Arizona. It grows on alluvial gravel covered soil associated with Larrea tridentata (DC.) Coville, Yucca brevifolia Engelm. var.jaegeriana McKelvey and Yucca schidigera Roezel ex Ortigies. Opuntia diploursina is most closely related to tetraploid Opuntia erinacea Engelm. & J.M. Bigelow, but differs in spine characteristics, larger fruit and seeds and diploid chromosome number.