Suffrutescent herbs up to 30 cm. high or more; stems ascending, subquadrangular, the upper portions slender, 1.5 mm. in diameter, sparingly puberulous, the older portions thickish, up to 3.5 mm. in diameter, whitish, glabrate; leaf blades lanceolate or oblong-lanceolate, the lowermost leaves up to 8 cm. long and 3 cm. wide, early deciduous, the upper leaves smaller and persistent, up to 5.5 cm. long and 1.8 cm. wide, all acute to acuminate (the tip itself blunt and more or less curved), narrowed or rounded, and more or less auriculate at base, the margins entire or undulate, the upper surface glabrous, the cystoliths numerous, minute and subpunctiform, the lower surface puberulous, the hairs subappressed, brownish, about 175 to 375 μ, long, the venation (lateral veins 6 or 7 pairs) more prominent beneath than above; petioles up to 2 mm. long, glabrous or sparingly puberu- lous; flowers borne in terminal panicles up to 10 cm. long and 5 cm. broad, the peduncles up to 2.5 cm. long, the lowermost internodes about 15 mm. long, the others successively shorter toward tip of inflores- cence, both peduncles and rachis slightly flattened, sparingly puberu- lous, the flowers solitary or several, borne in bracted fascicles, the bracts subulate, the largest and lowermost pair about 2 mm. long; bractlets similar, up to 1 mm. long, both bracts and bractlets carinate, glabrous or bearing a few minute hairs; pedicels slender, up to 2 mm. long, puberulous; calyx 2 mm. long, the segments narrowly triangular (their tips slenderly acute), 0.5 mm. wide at base, sparingly puberulous; corolla about 1 cm. long, white (?), minutely puberulous or the lobes glabrous, the tube narrow, subcylindric, 1.5 mm. in diameter, the limb spreading, the lobes ovate, obtusish, about 4 mm. long and 3 mm. wide; stamens 3 mm. long, attached at 3 mm. above base of corolla tube, glabrous, the filaments slender, the anthers slightly more than 1 mm. long, 0.75 mm. broad, the staminodes minute, filiform, 0.5 mm. long, more or less sigmoid; capsules clavate, puberulous, about 15 mm. long, 4-seeded, the seed-bearing portion about 8 mm. long, 4 mm. broad and 2 mm. thick; seed light brown, flattened, about 3 mm. in diameter, verrucose; retinacula 3 mm. long, curved, thin and truncate at tip. Type in the U. S. National Herbarium, No. 1954100, collected at Pueblo Rico, Department of Caldas, Colombia, 1,700 to 1,900 meters altitude, February 15, 1946, by Kjell von Sneidern (No. 5042). The salient characters of Pseuderanthemum sneidernii are its small, lanceolate leaves, graceful panicles, minute calyx, and broad-limbed corollas abruptly contracted to narrow subcylindric tubes. The color of the flower is not apparent in dried material. It is probably white but possibly faint purple.