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Herb to 40 cm high. Stem subquadrangular, sulcate, densely to sparsely hirsute to glabrescent, cystoliths inconspicuous. Leaves sessile to subsessile; blade linear to narrowly lanceolate, to 6.5 cm long and 1.2(-1.5) cm wide, acute to obtusish (tip itself blunt), narrowed at base, both surfaces densely to sparsely hirsute; primary vein and secondary veins (5-8 pairs) usually prominent on lower surface; cystoliths obscure. Inflorescence of sessile, solitary or paired flowers in axils of terminal leaves, often opposite; bracts 0; bracteoles linear to 6.5 mm long and 0.8 mm wide, hirsute. Calyx lobes linear-lanceolate, ca. 15 x 1 mm, densely hirsute; corolla blue, pink, whitish, violet or blue-violet, 45-50 mm long, pubescent, tube funnelform, ca. 20 mm broad at throat, narrow basal part ca. 10 x 2 mm, lobes ca. 15 mm long. Capsule ovoid, 10 x 5 mm, pubescent, apically apiculate, stipe ca. 3 mm long.
