Pseudostems 1.2--1.7 m. Leaves sessile; ligule elliptic, 2--3 cm, membranous, glabrous; leaf blade oblong-lanceolate, 25--35 × 6--8 cm, glabrous, base attenuate, apex acute. Spikes ca. 30 cm; bracts 50--60, lanceolate, 3--3.5 cm × ca. 5 mm, (1 or)2-flowered, margin involute; bracteoles linear, ca. 2.5 cm. Flowers yellow. Calyx 2.5--3 cm. Corolla tube ca. 4.5 cm; lobes linear, ca. 3.5 cm × 2--3 mm. Lateral staminodes lanceolate, ca. 3 cm × 5--7 mm. Labellum obovate-cuneate, ca. 3 × 1.5--2 cm, base attenuate into a 6--8 mm long claw, apex rounded, emarginate, or minutely 3-toothed. Filament ca. 5 cm; anther ca. 1 cm. Ovary oblong, ca. 2 mm. Stigma ciliate. Fl. Sep.
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