Original Description:The Cactaceae 2
p.201 - Britton & Rose (1920)
Stems rather stout, climbing or clambering, 2 to 3 cm thick, in cultivation somewhat branching, light green, the growing branches tipped with white hairs; ribs 8 to 10, separated by narrow intervals, undulating, with knobby areoles; areoles circular, with short tawny felt; spines about 12, conic, stiff, about 1 mm long, the 3 or 4 centrals thicker than the somewhat curved or hooked radials; bristles from the lower parts of the areoles, 6 or more, longer than the spines, hair-like; flower-buds covered with long white hairs; flower 25 cm long; outer perianth-segments narrow, in 2 or 3 series, brown, or inner series yellowish, acuminate, 8 to 9 cm long; inner perianth-segments shorter and broader than the outer, pure white, entire, acute; filaments 20; scales on the ovary and tube spreading, 4 to 6 mm long; fruit not known.
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