stems, 10-15 cm in diameter,
that branch profusely, forming large clumps up 1 m
and 60 cm high.
and crowned by a dense
mass of long white wool,
particularly at flowering time.
Ribs: There are 10 to 17 tuberculate ribs, with
a rounded, raised edge and a wide base.
convex, covered with short
wool when young, later glabrous,
about 0,5-0,8 cm, 2 cm apart.
Radial spines: 8-10, fairly slender or slightly curved,
horizontal, honey-amber, brown or black, becoming grey with age.
Centrals spines: Absent or one or two thicker ones, up to 3 cm long.
Roots: Fibrous, unlike other species which have taproots.
Flowers: Campanulate, 3 cm long, and they grow from the centre of
the white wool at the apex. The outer segments of the perianth are
linear and greenish. The inner segments are wide, blunt and yellow