Plants 25--65 cm tall. Rhizome 2--3 × 1--1.5 cm. Leaves 5 or 6; petiole 1.5--4 cm; leaf blade ovate, 7--9 × 3.5--5 cm, with purple marking adaxially, base subcordate or rounded. Peduncle 7--12 cm. Outer tepals 6, green, ovate-lanceolate, 3--4 × 1--1.3 cm, apex long acuminate; inner ones narrowly linear, 2.3--4 × 0.1--0.3 mm. Stamens 18, 1.2--1.5 cm; filaments ca. 2 mm; anthers 1--1.3 cm; free portion of connective purple-brown, less than 0.5 mm. Ovary ellipsoid, angular. Style red; stigma lobes 6. Fl. May--Jun.
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