Shrub up to 3 or 4 meters high; branches quadrangular, glabrous, or the nodes sometimes beset with a few stiff straight hairs about 0.5 mm. long; leaf blades oblong-lanceolate, up to 25 cm. long and 6.5 cm. wide, gradually narrowed from the middle to a slender and sometimes curved tip, acute at base and decurrent on the petiole, undulate, glab- rous, the lateral veins (10 to 12 pairs) rather prominent beneath; petioles 1 to 1.5 cm. long, connate at base by a small ridge or narrow band of leaf tissue; flower clusters secund, borne in terminal glabrous racemes about 12 cm. long, these sparingly branched; lower pair of bracts subtending the branches of the inflorescence linear-lanceolate, 2 cm. long, about 3 mm. wide at the base, slenderly acuminate, the others successively smaller toward tip; bracts subtending the flower clusters oblong-ovate, 12 mm. long and 6 mm. wide (successively smaller toward tip of the inflorescence), acute; bractlets oblong, 13 mm, long, 3 mm. wide, thinner than the outer bracts, faintly nerved; calyx segments linear-oblong to oblanceolate, slightly irregular in size, about 13 mm, long, 3 to 5 mm. wide, acute, pubescent at the tip, obscurely parallel-veined; corolla orange yellow or pale salmon, sparingly pubescent distally, the hairs curved, the tube 3.5 to 4 mm. thick at base, narrowed above the ovary to 3 mm., thence enlarged to 8 mm., but the throat itself narrowed to 5 mm., the lobes oblong, 5 mm. long, 3 mm. wide, rounded and emarginate; stamens exserted 1 cm. beyond the throat of the corolla, the filaments pilose; staminodes 12 mm. long, glabrous, the anthers 5 mm. long, their ventral surfaces pilosulous with straight erect hairs about 0.5 mm. long; ovary and style glabrous; fruit not seen. Type in the U. S. National Herbarium, No. 1517331, collected at headwaters of Río Tutunendo, east of Quibdó, Intendencia of Chocó, Colombia, May 20 or 21, 1931, by W. A. Archer (No. 2174). Cuatrecasas' No. 4627 (US), collected between Villavicencio and El Parrao, Meta, Colombia, 500 meters, November 10, 1938, and Camilo's No. 78 (GH), collected at Florencia, Caquetá, also represent the species. Sanchezia lutea resembles S. parviflora Leonard, an Ecuadorian species, but differs in its larger orange-yellow or pale salmon corollas (3.5 to 4 cm. long). The corollas of S. parviflora are 3 cm. long and pale scarlet in color.