Stems long and slender, nearly terete, somewhat vine-like in habit; ribs numerous, but low and indistinct; areoles approximate, bearing acicular spines and felt, but no wool or hairs; flowers axillary, solitary, small, narrowly campanulate, with a short limb; ovary and flower-tube very scaly, the scales bearing numerous silky hairs and bristly spines in their axils; fruit small, globular; seeds black, shining, pitted.
In its narrow flower, in the hairs in axils of the scales on the ovary and tube, this genus suggests Oreocereus, but is very different in habit. The flower of Leocereus is different from that of Nyctocereus in its narrow throat, short perianth-segments, hairy and bristly areoles.
The genus is named for Señor A. Pacheco Leäo, Director, Jardim Botanico, Rio de Janeiro, Brazil. The first of the 3 species here described is taken as the type.
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