Subspecies, varieties, forms and cultivars of plants belonging to the Sclerocactus parviflorus group

• Sclerocactus cloverae subs. brackii K.D.Heil & J.M.Porter
• Sclerocactus cloveriae K.D.Heil & J.M.Porter
• Sclerocactus contortus K.D.Heil: often has ribs arranged in a spiral or curved obliquely mostly clockwise. Distribution: south-east Utah.
• Sclerocactus havasupaiensis var. roseus Clover
• Sclerocactus parviflorus Clover & Jotter: has stems from 4.5 to 45 cm tall, 3.5-14.5 cm in diameter. Radial spines 8-17 straight. Centrals 4-8 per areole, 1-5 hooked usually purple- black. Distribution: northern Arizona to Colorado, northern New Mexico and southeast Utah.
• Sclerocactus parviflorus subs. havasupaiensis (Clover) Hochstätter: This subspecies shows similarities with Sclerocactus polyancistrus which occurs in California. Distribution: Havasupai Canyon (inside the Grand Canyon) in Arizona, USA.
• Sclerocactus parviflorus subs. intermedius (Peebles) K.D.Heil & J.M.Porter: has long not hooked upper central spine flattened to 1-1.5(-2) mm broad and seeds at most 2.5 mm broad. Distribution: Utah, Arizona, Colorado, and New Mexico.
• Sclerocactus parviflorus subs. macrospermus (Hochstätter) Hochstätter
• Sclerocactus parviflorus subs. terrae-canyonae (K.D.Heil) K.D.Heil & J.M.Porter: Has mostly yellow-flowered individuals. Distribution: Northern Arizona, Southeastern Utah.