Plants pubescent, 60--100 cm tall. Rhizome 4--6 × 1.2--2 cm. Stem densely pubescent. Leaves 10--13; petiole very short; leaf blade elliptic-lanceolate, 14--19 × 2.5--5.5 cm, base cuneate, densely pubescent along abaxial veins and at margin. Peduncle 14--25 cm, pubescent. Outer tepals 6, green, lanceolate, 5.5--9.5 × 1.2--2 cm, pubescent along abaxial veins; inner ones yellow-green, linear, conspicuously shorter than outer ones, 1--2 mm wide. Stamens 12, 2.7--3.7 cm; filaments 7--8 mm; anthers 1.1--1.4 cm; free portion of connective cylindric, 1.3--1.5 cm, apex acute. Ovary yellow-green or pale purple, subglobose, 1-loculed. Style short; stigma lobes 6. Capsule purplish green. Fl. Apr--Jul, fr. Aug.

* Forests; 1900--2400 m. S Gansu (Wen Xian).