Stenomesson leucanthum is a species of flowering plant in the family Amaryllidaceae.

[3] Pierfelice Ravenna, the Chilean botanists who first formally described the species, using the basionym Pucara leucantha, named it after its white (Latinized form of Greek λευκός, leukós) flowers (Latinized form of Greek ἄνθος, ánthos).

The cluster of flowers is subtended by narrow, papery bracts that are 2.5-3.1 centimeters long and come to a point at their tips.

Its flowers have a single thread-like style that is 1.9-2 centimeters long and topped by a 3-lobed stigma.

[4][1] It grows in northern Peru on rocky slopes and sandy places at elevations of 990-1,650 meters above sea level.