Rhizome subterete, 4--10 mm thick, densely covered with scales. Leaves solitary; petiole 4--45 cm; leaf blade narrowly elliptic to oblong-lanceolate, 17--50 × 3.5--13.5 cm, base cuneate, apex acuminate. Scape purple-brown, 10.5--22.5 cm; bracts 6--9. Flower solitary, nodding, slightly fragrant. Perianth yellow, campanulate, (6--)8(--10)-lobed apically; tube ca. 7 × 10 mm; lobes reflexed, suboblong, 0.8--1.5 cm × 7(--9) mm, slightly fleshy, smooth adaxially. Stamens 6--10, inserted at or slightly below middle of perianth tube, subsessile; anthers subreniform, ca. 5 mm. Pistil 7--8 mm; stigma slightly enlarged, ca. 1 mm in diam., exceeding anthers, inconspicuously 3-lobed at margin. Fl. Apr--May. 2 n = 36*.
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