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Kingdom: Plantae (Plant) Subkingdom: Viridaeplantae (green plants) Infrakingdom: Streptophyta Phylum/Division: Tracheophyta (vascular plants) Subphylum/Subdivision: Spermatophytina (plants that produce seeds) Infraphylum/Infradivision: Angiospermae (Flowering plant) Class: Magnoliopsida (dicots) Superorder: Caryophyllanae Order: Caryophyllales Family: Cactaceae (cactus) Subfamily: Opuntioideae Tribe: Cylindropuntieae Genus: Cylindropuntia (Chollas) Species: Cylindropuntia cholla (Chain-link Cholla) Genus: Opuntia (Prickly pear) Species: Opuntia fragilis (brittle prickly pear) Species: Opuntia polyacantha (plains pricklypear) Subfamily: Cactoideae (Globular Cacti, Moonlight Cacti, Torch Cacti, and Allies) Tribe: Pachycereae Genus: Pachycereus (Torch Cacti) Species: Pachycereus pringlei (Mexican Giant Cactus) Genus: Stenocereus (Pitayas) Species: Stenocereus gummosus (Galloping Cactus)