Monographs Details: Piper heterocarpum var. subglabricaule Yunck.
Authority: Yuncker, Truman G. 1955. Plants collected in Ecuador by W. H. Camp. Piperaceae. Mem. New York Bot. Gard. 9 (2): 147-170.
Description:Latin Diagnosis - Internodiis superis e modice ad dissite longe-villosis; petiolo 1 cm longo; drupa apice depressa.
Distribution and Ecology - Upper internodes slender, 3-5 cm long, glandular-dotted, moderately to sparsely long-villous, the hairs up to 2 mm long; base of the blade inequilateral with one side 5 mm shorter and subobtuse or acute, pinnately nerved from the lower half, the nerves about 5 on each side, with numerous intermediates, the uppermost pair extending to the apex and cross-connected with the midrib; petiole about 10 plus 5 mm long; fruit obypramidal-subtrigonous with a depressed apex and short, stout style.
Distribution and Ecology - SANTIAGO-ZAMORA ("Oriente"): Cordillera Cutucu, ca 2° 401 S, 78° W, ridge just south and west of Rio Itzintza, 1350-1650 m, Nov 17-Dec 5, 1944, E-1313 (TYPE).
This variety differs from the Peruvian species in its scarcely villous glabrescent internodes, leaves with acute or obtusish base, numerous intermediate nerves, and longer petiole. It also resembles both P. brownsbergense and P. setosum. From the former it differs because of its larger and more acuminate leaves, longer pubescence, and basally vaginate petioles. From the latter it differs because of its shorter peduncles, non-ligulate bracts, and rounded rather than linear stigmas.