Original Description:The Cactaceae 2
p.215 - Britton & Rose (1920)
Stems 1 to 2 cm broad, strongly 3-angled or some joints flat; margins acute, indented; areoles small, each hidden beneath a small thick scale, sometimes bearing 1 to 3 short weak spines; flower 4 to 7 cm long; outer perianth-segments and inner scales yellowish green, erect; inner perianth-segments white, oblong; tube proper smooth and white within; throat 1 cm long; stamens included; filaments white, a part attached to the lower face of the throat and a part to the upper margin; style white, included; stigma-lobes white (in wild state said to be purple); ovary tuberculate, green, with spreading scales, each subtending 4 to 8 long white hairs; fruit red, 2 to 3 cm in diameter, tubercled, at least when young.
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