FIRST DESCRIPTION: Krüger & Rischer - MafM 26(2): 96 - 102 (2002).
BODY: Depressed globose, sunken apically, solitary or clumping. To 10 - 20 mm high and to 35 mm in diameter.
ROOTS: Taproot, 10 cm long.
SAP: Without latex.
TUBERCLES: Tubercles are conical, somewhat soft, dark green to brownish green, 3 - 4 mm long, 2 - 3 mm in diameter.
AXILS: Axils are naked.
RADIAL SPINES: 25 - 32, radiating, straight or curved, strongly pubescent, glassy white, 1.5 - 2.3 mm long, soft.

CENTRAL SPINES: Absent.

FLOWERS: Funnelform, 13 - 15 mm long and wide, whitish to cream- colored with green flush. Inner petals with pink midveins on the sepals. Stigmas are yellow.

FRUIT: Green, 3 - 4 mm long and 3 mm wide.

SEED: Black, spherical, 1.1 mm long and 0.95 mm in diameter.

HABITAT SUBSTRATE: On limestone slabs and fine gravel.

GEOGRAPHIC DISTRIBUTION: Mexico; Zacatecas.

BIBLIOGRAPHY: AfM 26(2): 96 - 102 (2002).


Photo: Chris Davies.