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

• Mammillaria karwinskiana Mart.: (subsp. karwinskiana ) has medium yellow flowers with purpleish mid-veins, no central spine, and 6 radial spines.
• Mammillaria karwinskiana subs. beiselii (Diers) D.R.Hunt: has white flowers with red tinted mid-veins, one central spine, and 5-8 radial spines.
• Mammillaria karwinskiana subs. collinsii (Britton & Rose) D.R.Hunt: has white flowers with deeper pinkish mid-veins, one central spine, and 7 radial spines.
• Mammillaria karwinskiana subs. nejapensis (R.T.Craig & E.Y.Dawson) D.R.Hunt: also has white flowers with red tinted midv-eins, but the spines are larger and white and have much more wool. No central spines, and 3-5 radial spines per areole.