Herb; stems obtusely quadrangular, densely pilose with brownish hairs 1.5 to 2 mm, long; leaves oblong-lanceolate, up to 24 cm. long and 6.5 cm. wide, gradually narrowed from middle to a slender blunt pointed tip, acute at base and decurrent on the petiole, thin, entire or undulate, both surfaces rather sparingly pilose with hairs about 1 mm. long, those of the lower surface confined chiefly to costa and lateral veins (8 or 9 pairs), the upper surface bearing numerous cystoliths, these conspicuous under the lens; petioles 1 to 3.5 cm. long, pilose; flow- ers several, sessile or subsessile, clustered in the axils of the upper leaves; bracts narrowly linear, 1.5 to 3 cm. long 0.5 to 1 mm. wide, densely pilose with brownish hairs up to 2.5 mm. long; bractlets similar but smaller; calyx 5 mm. long, the segments unequal, subulate, 2.5 to 3.5 mm. long, pilosulous with white hairs 0.5 mm. long or a few reaching 1 mm. in length; corolla erect, 3.5 to 4.5 cm. long, minutely pubescent, the tube narrowly hypocrateriform, about 1 cm. in diameter at mouth, the limb about 2 cm. broad, the lobes oval, 12 mm. long and 10 mm. wide, rounded, the stamens included; style densely pilosulous; ovary tomentose. Type in the Herbarium of the Instituto de la Salle, Bogotá, Colom- bia, collected in the Comisaría of Caquetá, December 1930, by C. Uribe. Isotype in the U. S. National Herbarium, No. 1692607. Among the Colombian Ruelliae, R. uribei is a well-marked species. It can be easily recognized by its long, narrow, pilose leaves, narrowly linear densely pilose bracts, and the relatively small irregular calyx. The color of the corolla is not apparent in the dried material.