Shrub up to 3 meters high; stems quadrangular above, terete below, gray-tomentose, the hairs about 0.5 mm. long; leaf blades oblong-ovate, up to 14 cm. long and 5.5 cm, wide, acuminate at apex (the tip itself blunt), more or less abruptly narrowed at base and decurrent on the petiole, the margins entire or undulate, the upper surface finely pubes- cent, the hairs up to 0.5 mm. long, more numerous on costa and veins, the lower surface densely velvety pubescent, the hairs spreading, straight or curved, densest on costa and veins (6 or 7 pairs), the vena- tion prominent beneath, less so above; petioles up to 2 cm. long, tomentose; flowers borne in short racemes up to about 3 cm. long (including corollas), forming a terminal panicle about 10 cm. long and broad, its branches softly and finely pubescent, the lowermost up to 4.5 cm. long, the others successively shorter, the hairs about 0.25 mm. long, retrorsely curved, the pedicels up to 5 mm. long, finely pubescent, leaving prominent scars after falling, thus giving the rachis a conelike appearance; calyx finely pubescent and resin-dotted, the tube about 1 mm. long, the segments linear, about 1 cm. long, 2 mm. wide at base, acute at tip, densely pubescent, the hairs about 100 long, spreading or recurved; corolla yellow, densely pubescent except at base, the hairs straight and spreading, up to 150 μ long, intermixed with resinous discs, the tube 3 mm. broad at base, gradually enlarged to 3 mm. at 2 mm. above base, thence abruptly expanding to 1 cm. at mouth, the en- larged portion oblique, the lobes oval, 1 cm. long and about 6 mm, wide, rounded and emarginate at tip, their margins ciliolate; stamens long- exserted at maturity, the filaments attached near base of expanded part of tube, about 3 cm. long, strongly curved, glabrous or sparingly puberulous near base, the anthers 4.5 mm. long, 2 mm, broad; ovary puberulous and resin-dotted, the style about 3.5 cm. long, sparingly and minutely pubescent; capsule clavate, 2 cm. long, 7 mm. broad and 5 mm. thick, finely and densely puberulous, bearing interspersed, minute resin discs, the cavity extending nearly to base, 8-seeded (?). Ruellia longifilamentosa is characterized by its yellow flowers and long exserted, strongly curved stamens. In his comments on the species, Lindau states that he is unable to relate this species to any other Ruellia. It should, however, be near R. humboldtiana and R. tubiflora, as indicated by its conelike rachis. Found at altitudes between 1,050 and 1,550 meters, in Cauca and Cundinamarca, CUNDINAMARCA: Finca La Esmeralda, Vereda Tórriba, San Francisco, Gar- cia-Barriga 10998 (US). Hacienda Curiche, El Peñón, between Río Bunque and Río Murca, Garcia-Barriga 12478 (US).