Erect herbs about 30 cm. high; stems subterete, glabrous or the upper portions sparingly puberulous, the hairs minute and appressed; leaf blades oblong-elliptic, up to 18 cm. long and 4.5 cm. wide, acutish, the tip blunt, gradually narrowed from middle or slightly above the middle to base and decurrent on the petiole, rather thin, the margins shallowly and coarsely crenate, the upper surface glabrous, the costa impressed, this and the lateral veins (5 or 6 pairs) obscure, the lower surface sparingly puberulous, the hairs confined chiefly to costa and veins, these slightly more prominent than on the upper surface; petioles 5 to 10 mm. long, puberulous; flowers solitary, borne in a terminal, peduncled raceme about 12 cm. long, the peduncle (5.5 cm. long) and rachis glandular-pubescent, the hairs spreading, barely 0,25 mm. long, whitish, the lower pair of bracts borne on the peduncle about 1 cm. above its base, linear-subulate, carinate, 0.5 mm. broad at base, sparingly puberulous, those subtending the flowers similar but smaller, 3 to 1.5 mm. long; bractlets subulate, narrowly triangular, the lowermost 1.5 mm. long and 0.5 mm. wide at base; calyx 6 mm. long, the segments glandular-puberulous without, the hairs spreading, the tube 0.5 mm. long, the segments lanceolate, 1 mm. wide at base, acuminate, delicately 3-nerved; pedicels up to 3 mm. long, glandular- puberulous; corollas 1.5 cm. long, sparingly puberulous, white, the lobes purple-spotted, the tube 10 mm. long, 2 mm. broad near the base, contracted to 1.5 mm. at 3 mm. above base, abruptly expanded at sum- mit, the mouth 5 mm. broad, 2-lipped, the lobes of the upper lip oblong, 9 mm. long and 4 mm. wide, those of the lower lip ovate, 7 mm. long, the lateral 4 mm. wide, the middle 4.5 mm. wide, all rounded; stamens about 1 cm. long, attached in the throat of the corolla, exserted, re- curved, glabrous, the anthers 2 mm. long; staminodes 1.5 mm. long; style about 2 cm. long, sparingly puberulous near base, otherwise glabrous; stigma minute, about as broad as the style; ovary ovoid, 1.5 mm. long, sparingly glandular-puberulous; capsule not seen. Type in the U. S. National Herbarium, No. 1798532, collected in wet forests of the Río Putumayo, at Puerto Porvenir, Comisaría de Putumayo, Colombia, 230 to 250 meters altitude, November 19, 1940, by J. Cuatrecasas (No. 10671). The name poecilanthum is derived from Tokios, speckled, and areos, flower. Pseuderanthemum poecilanthum is a distinct species easily recog- nized by its glandular inflorescence and orchidlike blossoms.