Turbinicarpus valdezianus

Scientific Name: Turbinicarpus valdezianus (Moller) Glass & R.C. Foster
Synonym: Echinocactus valdezianus, Gymnocactus valdezianus, Mammillaria valdeziana, Normanbokea valdeziana, Pelecyphora plumosa, Pelecyphora valdeziana, Thelocactus valdezianus
Family: Cactaceae

Origin: Mexico (Coahuila, San Luis Potosí)

Growth Habits: Generally solitary, occasionally slowly clumping, dark green globose stems, up to 1.5 inches tall (4 cm), 1 inch in diameter (2.5 cm), long stem underground; 4-angled tubercles, 0.1 inch long and 0.1 inch wide (2.5 mm); numerous white hairs spreading flat around the areoles.

Older one in the HBG greenhouse (HBG 49414)

Turbinicarpus valdezianus flowers, picture by Gordon Smith

Blooming Habits:
Diurnal reddish flowers in late spring, early summer, up to 0.8 inch long and wide (2 cm). A white-flowered form is sometimes found as var. alba.