Herbs; stems ascending, up to 7 cm. high, moderately hirtellous, the hairs upwardly appressed or ascending, 0.5 mm. long; leaves usually about 10, somewhat crowded at the tip of the stem, the blades oblong-ovate or oblong-elliptic, up to 12 cm. long and 5.5 cm. wide, subacute, narrowed at base, submembranaceous, entire or undulate, the upper surface rather densely appressed-pilose, the hairs up to 1 mm. long, yellowish, the costa and lateral veins (8 to 10 pairs) obscure, the lower surface appressed-pilose, the hairs about 0.75 mm. long, more numerous on the costa and lateral nerves; petioles up to 2 cm. long, densely pilose, the hairs about 1 mm. long, ascending; spikes several, terminal and subterminal, up to 11 cm. long, lax at maturity, the peduncles (up to 5 cm. long) and rachises rather densely yellowish pilose, the hairs 0.75 to 1 mm. long, upwardly appressed or ascending; bracts erect or ascending, spreading at maturity, oblong-rhombic, up to 15 mm. long and 6 mm. wide, acuminate, appressed-pilose (the hairs about 1 mm. long), the margins bearing 3 pairs of slender ascending teeth up to 3 mm. long and 0.25 mm. wide at base; bractlets oblong- lanceolate, up to 1 cm. long and 2 mm. wide, acuminate, subcarinate, moderately pilose dorsally with appressed or ascending hairs, finely and obscurely parallel-nerved; calyx segments narrowly linear-lanceo- late, acuminate, finely striate, obscurely and sparingly ciliolate with ascending glandular hairs, the posterior segment 7 mm. long, 1 mm. wide, the anterior segments 6.5 mm. long and slightly over 0.75 mm. wide, the lateral segments 6 mm. long and 0.75 mm. wide; corollas about 15 mm. long, white with a yellow patch in front of the throat, finely and sparingly pubescent, the lips about 5 mm. long, the lobes ovate, rounded or shallowly emarginate; stamens exserted about 4 mm. beyond the mouth of the corolla throat, the filaments glabrous, the anthers 1.5 mm. long and 0.5 mm. wide, webby at tip; capsules not seen.
Type in the herbarium of the Royal Botanic Gardens at Kew, col- lected at San José, along the Río Putumayo, Colombia, August 3, 1899, by T. A. Sprague (No. 601). The specific epithet is derived from the Greek, wxpa, yellow, and Mápu, throat, in allusion to the yellow-throated corolla.