Original Description:The Cactaceae 3
p.18 - Britton & Rose (1920)
Stems usually single or in small clusters, sub-cylindric, 1 to 4 dm high, 8 to 12 cm in diameter; ribs 21 to 25, low; areoles large, longer than broad, about 1 cm apart; spines dull white or cream-colored, rather short and stiff, the radials 12 to 25, the centrals 8 to 12, often in 2 rows; flowers 5 to 6 cm long, usually narrow, with a short limb; ovary and flower-tube densely clothed with clusters of pale, straw-colored spines intermixed with white hairs; outer perianth-segments white, with a green medial line; inner perianth-segments narrow, 1.5 cm long, white with green bases; filaments green; style white; stigma lobes green; fruit densly spiny.
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