Original Description:The Cactaceae 3
p.131 - Britton & Rose (1920)
Cylindric, 6 dm high or more; ribs about 14; outer spines several, thread-like; central spines in 2 series, all straight, grayish, all annulate, subulate, the central one stouter, flatter, ascending; somewhat curved at tip; old flowers persisting, 6 to 7 cm long; fruit 3 to 4 cm long, bearing orbicular scales; seeds 2 mm long, finely reticulated
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