Plants 70--120 cm tall. Leaves 5 or 6; ligule entire, 0.7--1.5 cm; petiole 5--23 cm, adaxially grooved; leaf blade ovate on proximal leaves, oblong to lanceolate on distal ones, 25--100 × 10--20 cm, glabrous, base obliquely cuneate, apex acute. Spikes ovoid, 50--60-flowered; peduncle 12--32 cm, scalelike sheaths ovate-deltoid or ovate-oblong, 0.5--8 cm; bracts ovate-deltoid, ca. 5 × 3.5 cm, 3-or 4-flowered, soon decaying, apex mucronate; bracteoles 2.5--3 cm, split to base, soon decaying. Flowers yellow. Calyx ca. 2 cm, slightly split on 1 side, apex 3-toothed. Corolla tube ca. 1.6 cm; lobes oblong, 1.7--2 cm. Lateral staminodes red, toothlike, ca. 3 mm. Labellum cuneate, ca. 2.8 × 2.2 cm, apex emarginate, mucronate. Anther ca. 1.7 cm; connective appendage slightly 3-lobed, 4--5 mm × ca. 1.5 cm, apex toothed. Ovary glabrous. Capsule oblong-ovoid, ca. 2.9 × 2.5 cm, glabrous, 9-winged, apex with persistent calyx. Seeds ca. 3 mm, enclosed by white aril. 2 n = 48*.
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