solitary or cespitose from base sometime forming very large clumps up to
1 m wide.
Stem: Symmetrically globose, depressed, with apex that often
appears completely white, grey green, 12-15 cm high and in diameter.
Tubercles: Conical to quadrangular, keeled, arranged in numerous,
close-set spirals. (Parastichy
number 13-21) with dense white axillary wool and up to 8 white, twisted
Areoles: Oval and with white wool when young.
Radial spines: 10 - 14, white with tan to golden yellow bases, 2 -
8 mm long, upper ones shortest.
Central spines: 2 - 4 , straight, acicular/subulated, rigid,
divergent, golden brown, reddish to almost black, the 2-3 uppermost short
(approx 4 mm long) long, The lowermost longest 4 - 12 mm long (or more).
Flowers: Small, funnelform, 15 - 20 mm long, to 10 mm in diameter,
light greenish yellow with orange-yellow midveins, .
Fruits: Club shaped to cylindrical, attractively deep
coloured dull pinkish-red to scarlet, up to 20 mm long and 2 - 3 mm
subspecies, varieties and forms:
cobrensis is distinguishable from the type for the stem that is
always solitary with a very woolly apex. The stem is dark green and it
lacks of bristles in the woolly tubercles axil.
var. rubriflora as the name implies it has reddish flower.