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

• Mammillaria bombycina Quehl: Solitary or clustering cactus, some clones cluster aggressively and can form 50-90 cm wide mounds. It combines clean, glassy white radial spines with hooked reddish-brown centrals.This plant will produce several complete circles of contrasting light carmine flowers.
• Mammillaria bombycina f. albicentralis hort.: Has evenly white or creamy-white hooked central spines, (tips never reddish-brown). Cultivated form.
• Mammillaria bombycina f. flavispina hort.: Has evenly creamy-yellow or yellow hooked central spines, (tips never reddish-brown). Cultivated form.
• Mammillaria bombycina f. monstruosa green clone hort.: It is a strange monstrous cactus cultivar that forms very rubbery and squishy green and purple glob.
• Mammillaria bombycina f. monstruosa white clone hort.: It cluster aggressively and forms a gorgeous white mounds with a fluffy appearance.
• Mammillaria bombycina cv. Split Spine: This very rare cultivar has unique "Split spines". This is an exclusive feature never seen in other cacti.
• Mammillaria perezdelarosae Bravo & Scheinvar: Differs from Mammillaria bombycina in its darker centrals and denser, pectinately arranged radials that completely conceal the epidermis, and in its paler pink flowers.
• Mammillaria perezdelarosae subs. andersoniana W.A.Fitz Maur. & B.Fitz Maur.: distinguishable for the smaller size, slower growth and straight central spines (not hooked). It is believed to be one of the most beautiful Mammillaria. Distribution: Northeast, Zacatecas, Municipio Via Garcia
• Mammillaria perezdelarosae f. cristata hort.: crested form with stems densely covered with glassy white radial spines with hooked dark-brown centrals. It is one of the more beautiful crested Mammillaria.