Subspecies, varieties, forms and cultivars of plants belonging to the Mammillaria spinosissima group

• Mammillaria crassior Repp.: (subsp. tepoxtlana) Has very fine white yellow spines
• Mammillaria cylindrica (DC.) Don: The identity of this plant is extremely vague and unreliable. Possibly a form of Mammillaria spinosissina with few but strong brown spines?
• Mammillaria cylindrica f. cristata hort.: Nice crestested form with white radials and dark brownish-red central spines.
• Mammillaria pilcayensis var. chrysodactyla Appenz.: Differs from M. spinosissima in its smaller more compact tubercles and finer spines. It grows quite tall in age and may need something to lean on. Distribution: Guerrero.
• Mammillaria spinosissima Lem.: (subsp. spinosissima) has cylindrical stems that rarely grows higher than 30 cm, dirty white spines and lacks bristles in the axils. It is very variable due to its wide area of origin. Distribution: Morelos, Guerrero, and Mexico.
• Mammillaria spinosissima var. auricoma (A.Dietr.) Gürke: (subsp. tepoxtlana) Spines creamy white with pale orangiish to pinkish tips. Same as Mammillaria spinosissima ssp tepoxtlana??
• Mammillaria spinosissima var. auricoma f. cristata hort.: (subsp. tepoxtlana) Nice crested form with creamy spines that are pale orange-pink when young.
• Mammillaria spinosissima subs. pilcayensis (Bravo) D.R.Hunt: It has whiter spines, and the stems can grow up to 50 cm long/high. It might have some latex and bristles in the axils. The flowers are purple-pink. Distribution: Guerrero.
• Mammillaria spinosissima f. rubrispina cristata hort.: Crested form. Forms tangled brain-like cushions up to 30 (or more) cm in diameter densely spined with bright coppery red spines.
• Mammillaria spinosissima f. rubrispina hort.: The “rubrispina”” selection (a.k.a "Red-headed Irishman") forms nice clumps of columns, densely spined with bright coppery red spines.
• Mammillaria spinosissima var. sanguinea (F.Haage) F.Haage in L.H.Bailey ex Brandegee: has a dark green cylindrical stem and long white spines, the central spines having red tips.
• Mammillaria spinosissima subs. tepoxtlana D.R.Hunt: It has yellow spines.
• Mammillaria spinosissima cv. Un Pico: This is a stable genetic mutation in which each areole only produces one spine, but some perfectly spineless areoles are also present.
• Mammillaria spinosissima cv. Un Pico cristata: Crested form. Forms tangled brain-like cushions up to 30 (or more) cm in diameter, each areole only produces one spine.
• Mammillaria spinosissima cv. Un Pico Monstruosa: Almost spineless. The monstrous form differs from the standard cv. Un Pico in having mostly spineless areoles with only few occasional spines scattered irregularly on the stem.