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

• Mammillaria hahniana Werderm.: has 20-30 radials spines, one central spine (rarely more), and purplish red flowers. Distribution: Queretaro, Guanajuato, and Tamaulipas.
• Mammillaria hahniana f. albiflora hort.: has white flowers. Garden origin.
• Mammillaria hahniana subs. bravoae (R.T.Craig) D.R.Hunt: has 28-30 radials, usually 2 central and deep pink flowers. Distribution: Rio Blanco region of Guanajuato.
• Mammillaria hahniana var. giselana W.T.Neale: ha thinner hair less than 15 mm long and has up to 40 radial spines. Distribution: Tarajes, Guanajuato, Mexico.
• Mammillaria hahniana subs. mendeliana (Bravo) D.R.Hunt: has 2-4 central spines with very reduced or no radials, and pale pink flowers. Distribution: Guanajuato and Queretaro.
• Mammillaria hahniana var. werdermanniana F.Schmoll ex R.T.Craig: has axillary hairs up to 25 mm long, angular tubercles, and outer petals shortly ciliated, stigmas pink-brown. Distribution: Guanajuato, Mexico.
• Mammillaria hahniana subs. woodsii (R.T.Craig) D.R.Hunt: has 25-30 radial spines, usually has 2 centrals, and pink flowers. Distribution: Near Hacienda de Tarajeas, Guanajuato.
• Mammillaria saetigera Boed. & Tiegel: has shorter axillary hairs (less than 2.5 cm long), radial spines 15-20, central spines 2. Outer perianth segments shortly ciliated. Stigma lobes pinkish-brown . Distribution: Queretraro (Arroyo Seco and Sierra de Jalpan).