Peperomia nigricans is a species of terrestrial or epiphytic herb in the genus Peperomia that is native to Peru. It grows on wet tropical biomes. Its conservation status is threatened.
The type specimen were collected at La Merced, Peru at an altitude of 700 meters above sea level.
Peperomia nigricans is a medium-sized, more or less branched, erect herb with a stem 3âÂÂ4 mm thick covered in crisp pubescence. The alternate leaves are round-ovate, abruptly somewhat acute at both ends, measuring 3.5âÂÂ4 cm long and 3âÂÂ4 cm wide. They are slenderly 5-nerved, with the midrib obscurely branched, and when dry are thin, opaque, and dark brown. The underside is blackish-granular and crisp-pubescent, especially along the nerves. The crisp-pubescent petiole is 1âÂÂ3 mm long. The inflorescence was not seen on the type specimen.
It was described in 1936 by William Trelease in ', from specimens collected by Ellsworth Paine Killip & Albert Charles Smith.
The epithet nigricans is Latin for "becoming black," referring to the dark brown to blackish coloration of the dried leaves, particularly the granular undersides.
It is native to Peru. It grows as a terrestrial or epiphytic herb. It grows on wet tropical biomes.
This species has been assessed as threatened in a preliminary report.