branched with age, forming clumps.
Stem: Lime green, 6 cm in diameter, 5-7 cm tall, apex depressed
with white wool.
Tubercles: Conical, later rounded pyramidal, strongly elongated
upward, with a pronounced groove on upper surface, dimension about 1-1,2
cm long, width at the base 15 mm.
Parastichy number 8-13. Axil woolly only near the stem apex.
Areoles: Round, ± 2 in diameter with white wool in youth.
Radial spines: 14-18, grey-white, radiating, horizontal to
slightly protruding, straight, acicular up to 1,6 cm long largely
obscuring the stem, upper 2-3 more closely set, lower ones horn
coloured, upper ones brownish coloured later turning grey from the base.
Central spines: 1, sometime appearing very late, often not in all
areoles, at first black, then grey-white and spotty,
whit black tip. 15-20 mm long, porrect, curved downward, thick and
Roots: Diffuse or short taproots.
Flowers: Nearly apical, funnelform, 3,5 cm wide, pale yellow (sometimes
pinkish and proximally reddish). Perianth segment entire,
lanceolate, the outer one with a reddish midstripe.
Fruits: Green, ovoid, slimy; floral remnant strongly
persistent, fruiting 2-4 months after flowering.
Seeds: Reniform, brown 1,5 x1 mm wide, testa reticulate.