Peperomia alatiscapa is a species of epiphyte in the genus Peperomia that is endemic in Peru. It grows on wet tropical biomes. Its conservation status is Threatened.
The type specimen were collected near Eneñas, Peru, at an altitude of .
Peperomia alatiscapa is a medium-sized, nearly unbranched epiphyte with a smooth, hairless surface. Its leaves are alternate, though the uppermost ones may appear in whorls of three. The leaf blades are elliptic to slightly obovate in shape, with a bluntly pointed tip and a sharp, acute base. Each leaf measures in length and in width, featuring three to five nerves, with the midrib showing faint branching. When dried, the leaves take on a dull, olive-green tone, but in life they are a subtle rose color. The petioles are about 10 mm long and extend downward as ridges along the stem. The flower spikes are terminal, reaching in length and 2 mm in thickness, densely packed with flowers. These spikes are borne on a peduncle 10 mm long. The floral bracts are rounded and peltate, shield-shaped with the stalk attached at the center.
It was described in 1936 by William Trelease in ', from specimens collected by Ellsworth Paine Killip & Dorothea Eliza Smith. It got its name from the description of the type specimen.
It is endemic in Peru. It grows on a epiphyte environment and is a herb. It grows on wet tropical biomes.
This species is assessed as Threatened, in a preliminary report.