Giant Prickly Pear Cactus, Opuntia robusta. Also Called: Nopal Tapón, Bartolona, Silver Dollar Prickly Pear, Dinner Plate Cactus, Opuntia guerrana, Opuntia robusta var. guerrana. Xeriscape Landscaping Plants For The Arizona Desert Environment. Pictures, Photos, Information, Descriptions, Images, &amp; Reviews. Cactus.