Suffrutescent herbs; stems obtusely quadrangular, densely pilose or subtomentose with brownish hairs up to 4 mm. long; leaf blades ovate or elliptic, 16 cm. long and 8.5 cm. wide, acute (?) at apex, narrowed at base, entire or undulate, both surfaces pilose, the hairs 1 to 2 mm. long, confined chiefly to the costa and lateral veins (10 to 12 pairs); petioles 15 mm. long or more, loosely tomentose; flowers borne in a dense terminal spike 12 cm. long and about 3 cm. broad, each flower cluster subtended by a large leaflike bract, the lowermost of these ovate-lanceolate, 9 cm. long, 3 cm. wide, thence gradually re- duced toward tip, the uppermost ovate, about 14 mm. long and 8 mm. wide, all obtuse and closely imbricate; primary bractlets linear-lanceo- late, about 10 mm. long and 1.5 mm. wide, densely pilose with yellowish hairs up to 4 mm. long; secondary bractlets oblong-lanceolate, 1.5 to 2 cm. long, 3 to 5 mm. wide, densely pilose; pedicels 1.5 cm. long, glabrous; calyx 4.5 mm. long, thin, glabrous or minutely pilosulous at tip of segments, these subulate, 3 mm. long, 1.75 mm. wide at base, keeled; corolla hypocrateriform, 3 to 3.5 cm. long, minutely pubescent, mauve (?), the lower half slender, cylindric, about 1.5 mm. in diameter, the upper portion campanulate, 12 mm. broad at mouth, the limb about 2 cm. in diameter, the lobes ovate, about 8 mm. long and 7 mm. wide, rounded; stamens included, ovary and lower portion of the style (2 cm. long) pilosulous. Type in the Herbarium of the Instituto de la Salle, Bogotá, Co- lombia, collected in the Comisaría of Caquetá, Colombia, December 1930, by C. Uribe. Type fragment in the U. S. National Herbarium, No. 1692608. Ruellia lasiostachya is probably related to R. uribei, but it is easily distinguished by its dense terminal spike and large imbricated bracts. The type material is very fragmentary, and thus the dimensions given for the leaf blades may prove too small when more ample material is examined. The name lasiostachya is derived from Xários, shaggy, and Oτáxus, spike.