Subspecies, varieties, forms and cultivars of plants belonging to the Turbinicarpus horripilus group

• Turbinicarpus horripilus (Lem. ex Förster) V.John & Říha: Pungent pale to dark brown spines with blackish tip that become greyish white, areoles with white wool (when young), soon becoming bare.
• Turbinicarpus horripilus subs. kvetae (Chvastek & Halda) Chvastek & Halda
• Turbinicarpus horripilus f. monstruosa: It forms dense clusters, composed of a great number of soft green stems, each of them usually less than 2 cm wide, some only a few mm across. The spines are all radials: 1-3 mm long, bristle-like, somewhat bent.
• Turbinicarpus horripilus subs. wrobelianus Nitzschke & Montes: has almost white radials and darker brow to black central spine (versus tan to brownish spines), and a little smaller flower. Distribution: North of Metztitlan near Jilos (Gilo, Xilo), Hidalgo, Mexico.