Plants tall, 5 to 6 meters high, much branched, the branches somewhat spreading, light green when young; ribs 7 or 8, low and rounded; areoles rather close together, 1 to 1.5 cm. apart; spines numerous, often 12, very stout, rigid, sometimes 7 cm. long, swollen at base; flowers 12 to 14 cm. long, doubtless nocturnal but, sometimes at least, remaining open during the morning, fragrant; flower-tube green, 5 to 6 cm. long; inner perianth-segments oblong, white, 4 to 5 cm. long; filaments weak, declining on the lower side of the throat; scales on the ovary and flower-tube small, bearing a few long hairs in their axils; fruit not known.
Collected by J. N. Rose below Cuzco, Peru, September 1, 1914 (No. 19022).
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