Herbs perennial, (15-)20-25(-30) cm tall. Stems several, cespitose, sparsely pubescent, with persistent withered leaves and branches at base. Petiole of basal leaves 3-6 cm, to 1 cm in stem leaves; leaf blade lanceolate to elliptic-lanceolate, 3-5.5 × 0.8-1.5 cm, pubescent, abaxially more densely pubescent, apex acuminate to acute. Inflorescences 2-4, terminal on stems, usually 4-10-flowered, forming 1 or 2 verticillasters on branches. Pedicel 3-6 mm, erect at anthesis, elongated in fruit, sparsely pubescent. Calyx lobes erect, ovate-oblong, ca. 1 mm at anthesis, to 1.5 mm in fruit, strigose, apex acute. Corolla white, campanulate-rotate; tube 0.7-1 mm; appendages lunate, papillate, apex 2-cleft; limb ca. 6 mm wide; lobes orbicular-ovate, 1.5-2 mm. Anthers broadly elliptic, ca. 0.5 mm. Style ca. 1 mm. Gynobase ca. 1 mm. Nutlets dorsiventrally compressed, 2-3 × 1-1.5 mm excluding marginal glochids, keeled adaxially, finely tuberculate and slightly hispid; disc ovate-triangular, flat or slightly convex, densely hispid; marginal glochids 0.2-0.5 mm, free or slightly united at base, anchorlike at apex; attachment scar below middle adaxially. Fl. and fr. Jun-Jul.
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