Original Description:The Cactaceae 2
p.101 - Britton & Rose (1920)
Stems weak, forming dense thickets, dark green, 1 to 4 meters long, about 4 cm thick, usually with few branches or none; ribs 3 or 4, sometimes 6, more or less interrupted, little undulate; areoles borne in the depressions of the ribs, large, white-felted, bearing spines only in the lower part; spines 5 to 8, brown, becoming white, acicular, 1 to 2 cm long; flowers greenish white, about 6 cm long; outer perianth-segments linear-oblong, spreading; ovary with small scattered scales, at first without spines; fruit very spiny, spherical 4 cm long
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