Shrubs up to 2 meters high; stems subquadrangular, puberulous, the hairs closely and upwardly appressed, whitish, up to 0.2 mm. long; leaf blades oblong, up to 28 cm. long and 10 cm. wide, short-acuminate, narrowed from about the middle to a cuneate base and decurrent on the petiole, rather thin, entire or undulate, the upper surface glabrous or the costa sparingly and minutely puberulous, the lower surface evenly hirtellous, the hairs appressed, resembling those of the stem, the costa and lateral veins (about 12 pairs) moderately prominent; petioles (unwinged portion) up to 4 cm. long, the pubescence that of the stem; spikes solitary, terminal, up to 23 cm. long and 1.5 cm. broad, the rachis glabrous; peduncle 5 mm. long, appressed-puberulous; bracts orange (Grant), ovate, 13 mm. long, 11 mm. wide, acute (the tip itself obtuse), glabrous or minutely ciliolate, striate-nerved, the glandular area dull, oval, about 1.5 mm. long and 1 mm. wide; bractlets falcate- lanceolate, 12-14 mm. long, about 3 mm. wide at middle, acute, the costal region and tip densely and softly hirsute, the hairs more or less appressed, up to 0.25 mm. long, the marginal region (about 1 mm. wide) glabrous and sparingly and minutely papillose; calyx 1.5 cm. long, the segments glabrous, rather sparingly and minutely papillose dorsally and tipped by a few minute hairs, the posterior segment ovate, about 6 mm. wide, subobtuse, the anterior segments lanceolate, about 4 mm. wide, acute, the lateral segments lanceolate, about 3.5 mm. wide, subobtuse and apiculate; corolla orange, up to 6 cm. long, papillose except the glabrous basal portion, the tube subcylindrical or rather narrowly infundibuliform, 3 to 4 mm. wide at or near base, 7 mm. wide at mouth, the upper lip erect, ovate, bilobed at tip, the lobes narrowly triangular, 3 mm. long, 1.5 mm. wide at base, acumi- nate, the middle lobe of lower lip ascending, oval, acute, about 10 mm. wide at middle, the lateral lobes adnate to the upper lip, the free portion triangular, subacute, 1.5 mm. long and 1 mm. wide at point of attachment; stamens reaching the tip of the upper lip, the anthers glabrous except the arachnoid tip, 7 mm. long, 2 mm. broad, acute at both ends, the style glabrous or sparingly pilose at base; ovary glabrous; capsules not seen. Type in the U. S. National Herbarium, No. 2045425, collected in temperate forest on the Caraucha Range, east of Ibama, 13 km. east of Yacopí, near the Boyacá border, Department of Cundinamarca, 2,250 meters altitude, May 8, 1944, by Martin L. Grant (No. 9167). Isotype: US, 2144299. Aphelandra atecmarta in the key would follow A. crenata, but it differs in having entire instead of crenate leaves. The spikes of A. crenata, too, are shorter and more compact. The specific epithet is from the Greek áréxuapros, meaning without distinctive mark.