Herbs, weak to ascending, to 20(-30) cm tall; stems drying gray or grayish yellow, weakly rugose, densely tomentulose-villosulous. Leaves in subequal pairs; petiole 0.1-1.5 cm, densely tomentulose; blade drying papery, adaxially green, grayish green, or dark grayish brown, abaxially pale to red, ovate, lanceolate, elliptic, or elliptic-oblong, (0.5-)2-5.5(-9) × (0.4-)1-2.5 cm, adaxially subglabrous to sparsely strigillose or hispidulous, abaxially densely puberulent to tomentulose or sometimes glabrescent, base cuneate and generally decurrent, margins entire to somewhat undulate, apex acute to obtuse, subacuminate, or rounded; secondary veins 5-8 pairs; stipules caducous, linear, 1-3 mm, puberulent. Inflorescences congested-cymose, several to many flowered, densely tomentulose-puberulent; peduncle 0.3-1.2 cm; branched portion 5-10 × 10-12 mm; axes becoming helicoid; bracts few, narrowly triangular to linear, 0.3-2 mm. Flowers homostylous, subsessile or on pedicels to 1.5 mm. Calyx with hypanthium subglobose, 0.8-1.2 mm, 5-ribbed, densely hispidulous except ribs glabrescent; lobes subtriangular to linear, 0.3-0.6 mm, glabrescent. Corolla white, tubular to inflated, outside puberulent to hispidulous; tube 2.5-2.8 mm, with villous ring in throat to villosulous throughout inside; lobes ovate-triangular, 1.2-1.5 mm, dorsally weakly ribbed, acute to obtuse. Capsules drying brownish yellow, mitriform or somewhat obcordate, 2-2.5 × 5-7 mm, hispidulous. Fl. Apr-Sep, fr. Jun-Oct.
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