Perennials 8-30 cm tall. Rhizomes blackish, short, with few slightly fleshy rootlets. Stems erect, striate, simple, base sheathed by blackish remains of old petioles. Basal leaves petioles flattened and 4-6 cm; leaf blade usually folded, linear-oblong, 3.5-7 × 0.5-2 cm, base narrowed, apex obtuse, veins 3-7. Stem leaves alternate, sessile, subamplexicaul; lower stem leaf blades similar to basal leaves; middle to upper leaves ovate-oblong to ovate, 2.5-4 × 0.7-1.2 cm, base rounded and decurrent into narrow wings along stem, apex acute, veins 3-5. Inflorescences racemelike, 5 or more flowered. Flowers 5merous. Pedicel spreading, 3-5.5 cm, stout. Calyx slightly unequal, shorter than to longer than corolla; lobes green, foliose, ovate-lanceolate to ovate, rarely narrowly lanceolate, (0.8-)1-1.6(-2.5) cm, 3-10 mm wide at base, base rounded to cordate, apex acuminate to acute, veins 1-3. Corolla pale yellow, 1.5-2(-3) cm in diam., tube 1.5-2 mm; lobes ovate-oblong, 1-2.5(-2.9) × 0.5-1.1(-2) cm, margin entire or erose, apex obtuse. Nectaries 2 per corolla lobe, cupular, with pilose fimbriae 2-2.5 mm. Filaments 1-1.3 cm, base fimbriate-barbate; anthers blue, ellipsoid, 2-3 mm. Style indistinct; stigma lobes suborbicular. Capsules ovoid-ellipsoid, 1.3-1.5 cm. Seeds light brown, subglobose, 1-1.2 mm in diam., both ends with narrow irregular wings. Fl. and fr. Jul-Sep.
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