Plants 50--115 cm tall. Rhizome ca. 25 × 4.5 cm. Leaves 9 or 10; petiole purple, ca. 6 cm, leaf blade oblanceolate or oblong, ca. 25 × 9 cm, wrinkled, base rounded. Peduncle (8--)35 cm. Outer tepals 6 or 7, green, ovate-lanceolate or lanceolate, ca. 8 × 2 cm; inner ones yellow-green, filiform-linear, ca. 8 cm × 1--2 mm. Stamens 12 or 14; filaments green, ca. 7 mm; anthers dark purple, ca. 1.5 mm; connective not exserted. Ovary green, ovoid, 6-or 7-loculed, 6-or 7-ribbed. Style short; stigma lobes 6 or 7. Fl. May.
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