Herbs up to 30 cm. high or more, ascending; stems subquadrangular, grooved, both pilose and bifariously subtomentose, the longer hairs spreading, nitid, septate, up to 5 mm. long, those arranged in lines about 0.5 mm. long, dense and retrorsely curved; leaf blades oblong- ovate, up to 12 cm. long and 5.5 cm. wide, short-acuminate (the tip itself blunt), narrowed at base, rather thin, undulate, the upper surface moderately pilose, the hairs ascending, brown, nitid, septate, the lower surface densely pilose, the hairs similar to those of the upper surface, the costa and lateral veins (6 to 8 pairs) obscure above, less so beneath, the cystoliths obscure or lacking; petioles up to 1.5 cm. long, densely pilose, the hairs resembling those of the stem; spikes terminal and axillary, up to 5 cm. long and 1 cm. wide, the bracts closely imbricate, secund, the rachis angled, glabrous or moderately hirtellous with curved hairs, the peduncle up to 5 mm. long, pilose; bracts elliptic, up to 14 mm. long and 13 mm. wide, obtuse and apiculate (the apiculus about 0.5 mm. long), cuneate at base, thin, the costa and veins rather prominent, both surfaces glabrous or bearing a few scattered hairs, the margin densely ciliate with nitid spreading septate brown hairs up to 4 mm. long; bractlets linear-subulate, up to 7 mm. long, and 0.5 mm. wide at base, ciliate, the hairs similar to those of the bracts; calyx 4 mm. long, the segments lanceolate, 3.5 mm. long, 0.75 mm. wide, slenderly acuminate, bearing several trichomes (up to 1.5 mm. long) at and near tip, otherwise glabrous; corolla white, about 2 cm. long, moderately hirtellous, the hairs up to 0.28 mm. long, the tube 2 mm. broad at base, 3.5 mm. broad at mouth, the upper lip oblong, erect, 6.5 mm. long, about 3 mm. wide, rounded and emarginate at tip, the lower lip spreading, 3-lobed, the lobes obovate, 5 mm. long, 3 mm. wide, rounded at tip; stamens about 4 mm. long, the cells superposed, nearly vertically attached, about 1 mm. long, 0.5 mm. broad, the lower cell terminated by a conspicuous white tail 0.5 mm. long, this flattened and rounded at tip; capsule 8 mm. long, 2.5 mm. broad and 1.5 mm. thick, glabrous or sparingly hirtellous near tip; retinacula 1 mm. long, narrowed, blunt and sub- cucullate at the tip; seed brownish, ovate, 2 mm. long, 1.5 mm. wide, faintly tuberculate. Type in the Herbario Nacional Colombiano, collected in woods along the Río Guayabero, Comisaría del Vaupés, Colombia, 240 meters altitude, Nov. 8, 1939, by J. Cuatrecasas (No. 7536). Cuat- recasas' No. 7542 (Col), collected on the same day nearby, is also of this species. Justicia hyperdasya is closely related to J. pampolystachys Leonard, differing chiefly in its herbaceous nature, the white flowers, and oblong or oblong-ovate leaf blades. J. pampolystachys is a shrub with blue flowers and ovate leaf blades. The specific epithet is derived from the greek inépôaous, meaning very hairy.