Original Description:The Cactaceae 3
p.229 - Britton & Rose (1920)
Plant a little longer than thick, 1 to 2 dm high, yellowish green; ribs 14 to 18, sometimes branching above, rather low, 1 to 1.5 cm high, 1 to 2 cm broad at base, rounded, separated from one another by acute intervals; areoles small, depressed, 1 cm apart; spines horn-colored, but often with brownish tips or some, especially the central ones, brown throughout, at least when young; radial spines 8 to 10, 1 to 1.5 cm long, more or less curved inwards; central spines usually one, sometimes 2 or 3, a little stouter than the radials; cephalium small, 6 to 7 cm broad at base, 2 to 3 cm high, made up of soft brown bristles and white wool; flowers small, purplish; fruit clavate, 2.5 cm long purple; seeds black.
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