Herbs or subshrubs, weak to ascending, to 2 m tall; stems densely hispid. Leaves in markedly unequal pairs; petiole 0.3-2 cm, densely hispid or pilose; blade drying papery, lanceolate to narrowly elliptic, larger ones 5-15 × 2.5-4.5 cm, smaller ones 2-6(-8) × 1-2 cm, strigose adaxially, densely hirtellous or hirsute along principal veins abaxially, base acute to attenuate, apex acuminate to caudate; secondary veins 7-12 pairs, prominent adaxially; stipules caducous. Inflorescence cymose, many flowered, densely villous; peduncle 1-3 cm; axes several, helicoid; bracts absent or minute. Flowers distylous, subsessile. Calyx glabrous or ferruginous mealy puberulent; hypanthium rhombic-turbinate, ca. 1 mm, 5-ribbed; lobes subtriangular, ca. 0.4 mm. Corolla white, salverform-tubular and slightly contracted in middle, glabrous outside; tube 7-8 mm, barbate in throat; lobes triangular, 1.8-2 mm, dorsally costate to narrowly winged near apex. Capsules drying reddish brown, broadly mitriform, ca. 1.5 × 5 mm, 5-ribbed, subglabrous. Fl. Oct.
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