Plants 50--70 cm tall. Rhizome ca. 12 × 3--4 cm. Leaves 4 or 5; petiole 1.8--6 cm; leaf blade obovate, 10--15 × 6.3--10 cm, wrinkled, base rounded. Peduncle 9--25 cm. Outer tepals 4 or 5, green, ovate, 3.5--4.5 × 1.7--3.5 cm; inner ones erect, yellow-green, filiform-linear, ca. 7 cm × 1--2 mm. Stamens 12 or 15; filaments green, ca. 4 mm; anthers purple, ca. 1 cm; connective not prolonged. Ovary subglobose, ca. 5 mm in diam., 4-or 5-loculed, 4-or 5-ribbed. Style short; stigma lobes 4 or 5. Fl. May.
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