Stenostephanus brevistamineus is a species of flowering plant first collected 11 July 2013 in Junín, Peru.

Leaves slightly unequal in each pair, petiolate, glabrous; lamina membranaceous, 3.8 – 10.5 × 0.8 – 3.5 cm, oblong-elliptic, apex acuminate, base acute, margin entire, slightly undulate, venation camptodromous, lateral veins 6 – 8 pairs, adaxially, green, with numerous small cystoliths and impressed veins, abaxially shiny, veins prominent, reticulate; petiole 0.2 – 1.3 cm long.

[3] The genus Stenostephanus ranges from the southern portion of Mexico through Central America.

Stenostephanus brevistamineus is a perennial herb endemic to the Otishi National Park in the Rio Tambo district (Junín, Peru) at 2060 m. It grows in undisturbed montane sclerophyllous forests with humus-enriched soils.

More information is needed, therefore, the species is currently assigned the category Data Deficient (DD) according to IUCN.