Perennials 20-30 cm tall. Rhizomes blackish, short, with few slightly fleshy rootlets. Stems somewhat flexuose to erect, striate, simple, base sheathed by blackish remains of old petioles. Basal leaves withered at anthesis. Stem leaves alternate; petiole flattened, 4-6.5 cm, shorter toward apex. Lower stem leaf blades broadly elliptic, 2-15 × 5.5-6.5 cm, base obtuse to rounded, apex obtuse, veins 9-11 and arcuate; middle to upper leaf blades decreasing in size toward stem apex, sessile, ovate-lanceolate, 2-4.5 × 0.5-1.6 cm, base rounded and subamplexicaul, apex acuminate, veins 3-5. Inflorescences racemelike cymes, (1-)3-7flowered. Flowers 4-(or 5)-merous. Calyx lobes linear-lanceolate, 1.7-2.5 cm, apex acuminate, midvein slender. Corolla pale yellow-green, with brown veins, 2.5-4 cm in diam., tube 2-3 mm; lobes oblong, 2.8-3.2 cm, apex acuminate and caudate. Nectaries 2 per corolla lobe, orbicular, with few hispid fimbriae 3-3.5 mm. Filaments 1.2-1.3 cm, base fimbriate-barbate; anthers ellipsoid, 3-3.5 mm. Ovary ellipsoid, 8-9 mm. Style indistinct; stigma lobes suborbicular. Fl. Aug-Sep.
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