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

• Mammillaria elegans DC.: is a 'nomen confusum' (confused name) applied bolth to Mammillaria geminispina with latex in the stem and to Mammillaria haageana, without latex in the stem.
• Mammillaria geminispina Haw.: (var. geminispina) it has 2 central spines of different length, white with darker tips.
• Mammillaria geminispina f. alba hort.: (or "nivea" ) Cultivated form with pure white spines (same as Mammillaria geminispina ssp. leucocentra?)
• Mammillaria geminispina var. brevispina (Hildm.) Backeb.: form with 2 short darker tipped central spines.
• Mammillaria geminispina subs. leucocentra (A.Berg) D.R.Hunt: With 5-6 pure white central spines.
• Mammillaria geminispina var. monacantha Lem. & Monv.: Form with only one central spine.
• Mammillaria geminispina var. nobilis (Pfeiff.) Backeb.: This is one of the best forms with very long central spines that are of the same lenght.
• Mammillaria geminispina var. nobilis f. cristata
• Mammillaria geminispina var. tetracantha Lem. & Monv.: Form with 4 central spines.