Herbs or subshrubs, ascending, to 100 cm tall; stems glabrescent to puberulent. Leaves in subequal pairs; petiole 1.5-5 cm, glabrous to puberulent; blade drying thinly papery, elliptic or lanceolate-elliptic, 2.5-22 × 1-9 cm, glabrous adaxially, glabrous or puberulent on principal veins abaxially, base cuneate to obtuse, apex acute to acuminate; secondary veins 10-19 pairs; stipules deciduous, narrowly triangular, 4-8 mm, sometimes 2-lobed, glabrescent. Inflorescence cymose to paniculate, several to many flowered, puberulent; peduncle 0.5-6 cm; axes helicoid; bracts reduced and caducous or none. Flowers apparently distylous, subsessile. Calyx densely puberulent; hypanthium compressed turbinate, ca. 1 mm; lobes triangular, 0.5-1 mm. Corolla white, tubular or sometimes constricted near middle, outside puberulent to glabrous; tube 2.5-4 mm, inside villosulous near middle; lobes triangular, ca. 1 mm, dorsally smooth to costate. Capsules broadly mitriform, 1.5-3 × 3-9 mm, glabrous to densely puberulent.
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