Herbs up to 130 cm. high; stems subquadrangular, glabrous; leaf blades oblong-elliptic, up to 20 cm. long, 7 cm. wide, short-acuminate (the tip itself blunt), narrowed at base, firm, entire, both surfaces glabrous or the costa and lateral veins (7 or 8 pairs) sparingly puberu- lous, the hairs curved, about 0.2 mm. long, the venation rather prominent, more so beneath than above, the cystoliths prominent beneath, up to 0.2 mm. long, obscure above; petioles up to 15 cm. long, glabrous; spikes solitary or in pairs, up to 4 cm. long and 8 mm. broad, rather dense, the peduncles (up to 3 cm. long) and rachises minutely and sparingly strigose, the hairs up to 0.1 mm. long; bracts subulate, subcarinate, 5 mm. long, 0.5 mm, wide near base, sparingly strigose, the hairs about 0.1 mm. long; bractlets narrowly triangular, 1.5 mm. long, 0.5 mm. wide at base, sharply acute, ciliate; calyx 3 mm. long, the segments nearly triangular, 0.75 mm. wide at base, sharply acute, ciliate, bearing several small trichomes at tip; corolla white, pu- berulous, up to 38 mm. long, the tube 2.5 mm. broad at base, narrowed to 1.5 mm. at 3 mm. above base, thence gradually enlarged to 5 mm. at mouth, the lips up to 11 mm. long, the upper lip triangular ovate, 5 mm. wide at base, emarginate and rounded at tip, the lower lip oblong, 5 mm. wide at base, 3-lobed at tip, the lobes oblong-ovate, about 8 mm. long, the middle lobe 4 mm. wide, the lateral slightly narrower, all rounded; stamens exserted about 10 mm. beyond mouth of corolla, the filaments glabrous the anthers superposed, almost vertically attached, the connective 1.5 mm. long between points of attachment and 0.5 mm. wide, the lobes 2.25 mm. long, 0.5 mm. broad, glabrous, the lower lobe subacute at base; ovary glabrous; capsule not seen. Type in the Herbarium of the Missouri Botanical Garden, No. 1014436, collected in forest at Poponte, in the Magdalena Valley, Department of Magdalena, Colombia, December 12, 1924, by Cyril Allen (No. 844). Isotype: K. The specimens examined had dried to a dark olive-black color. The corollas of the Kew specimens were much smaller (about 24 mm. long) than those of the Missouri sheet. The specific epithet is from the Greek Oxirós, meaning shaded.