Subspecies, varieties, forms and cultivars of plants belonging to the Stenocactus crispatus group-complex

• Stenocactus anfractuosus (Mart. ex Pfeiff.) A.Berger: ( Stenocactus crispatus ? ) The plant found in cultivation are quite variable, and the dissimilarity among seedlings spination may be considerable.
• Stenocactus arrigens (Link ex A.Dietr.) A.Berger: The ribs are thin with very undulated or curled ridges. The plant found in cultivation are quite variable (same as Stenocactus crispatus)
• Stenocactus arrigens f. cristatus hort.: Crested form.
• Stenocactus confusus (Britton & Rose) F.M.Knuth in Backeb. & F.M.Knuth
• Stenocactus crispatus (DC.) A.Berger: It is a solitary plant closely covered with long spines and wavy ribs. This is a very variable species that now includes many form (previously considered independent species) with one form intergrading into another, creating a taxonomig nightmare.
• Stenocactus crispatus f. cristatus hort.: crested form.
• Stenocactus dichroacanthus (Mart. ex Pfeiff.) A.Berger ex Backeb. & F.M.Knuth
• Stenocactus fasciculatus hort.: Branched (or solitary) plant, up to 20 cm tall, 10 cm wide with long spines and wavy ribs. Cultivated form.
• Stenocactus gladiatus (Link & Otto) A.Berger ex Backeb. & F.M.Knuth: This plant is characterized by large, wide and flat sword-shaped central spines.
• Stenocactus grandicornis (Lem.) A.Berger ex Backeb. & F.M.Knuth: has very long flattened central spines.
• Stenocactus guerraianus (Backeb.) nov. comb. ined.: Globular, to 20 cm broad, dark-green with woolly apex. Spine are flattened, ferocious-looking with one very long milk-white central spine directed upwards.
• Stenocactus guerraianus f. cristatus: The crested form deviate considerably from the typical form for having thinner and densely packaged spines, however the overall appearance depend on clones.
• Stenocactus hastatus (Hopffer ex K.Schum.) A.Berger: Solitary cactus with long rigid and sharp spines. The plants in cultivation are quite variable.
• Stenocactus kellerianus hort.: The upper spine spines are long flat and straight.
• Stenocactus lamellosus (A.Dietr.) A.Berger: Solitary plant crowded with long spines and many wavy ribs.
• Stenocactus longispinus hort.: has very long spines. Cultivated form.
• Stenocactus violaciflorus (Quehl) A.Berger: Up to 20 cm tall, 10 cm wide with very long spines and wavy ribs. The ribs are thin with very undulated or curled ridges. Flowers pink-violet.
• Stenocactus wippermannii (Muehlenpf.) A.Berger: Up to 15 cm highly with about 35 ribs, weakly wavy. Radial spines: up to 18-22, sharp, white. Central spines: 3 awl-like, 2-6 cm long, the upper one more or less flat pressed and weakly curved milky-white with almost blackish-brown base
• Stenocactus xiphacanthus (Miq.) hort., nov. comb. ined.: ( Stenocactus crispatus ? ) "xiphacanthus" is an unclear name applied to variuos Stenocactus in cultivation. This plants are characterized by flattened (Sword-shaped), ferocious-looking spines with one long central spine directed upwards.