Rhizome terete, 3--7 mm thick. Leaves solitary; petiole 10--26 cm; leaf blade spotted with yellow-white, oblong-lanceolate to narrowly elliptic, 19--30 × 3--6 cm. Scape 0.5--1.5 cm, bracts 1 or 2. Flower solitary, fragrant. Perianth yellow, tinged purplish adaxially and whitish abaxially, campanulate, 5- or 6-lobed apically; tube 7--13 × 5--7 mm; lobes reflexed, lanceolate, 5--7 × 2--4 mm, with 2 fleshy keels adaxially. Stamens 6, inserted proximally in perianth tube, positioned lower than stigma, subsessile; anthers elliptic, ca. 2 mm. Pistil 3--8 mm; stigma purple, 3--4 mm in diam., adaxially concave, slightly 3- or 6-lobed at margin. Berry ovoid, 1--1.5 cm in diam., tuberculate. Fl. Sep--Oct, fr. Jan--Jul. 2 n = 38*.

* Forested slopes; ca. 800 m. SC Sichuan (Muchuan Xian).