Rhizomes white inside, 1.5--2.5 cm in diam. Pseudostems 1.5--2.5 m. Ligule ca. 2 mm, apex emarginate; petiole ca. 5 mm; leaf blade elliptic-oblong, 20--45 × 4--11 cm, glabrous, base narrowed, apex acuminate. Inflorescences arising from rhizomes, fusiform, 7--14 × 2.5--3 cm; peduncle erect, 17--25 cm, scalelike sheaths 1--4.5 cm; bracts obovate, 3.7--5 × 1.5--6 cm, apex obtuse; bracteoles ovate-oblong, 3--3.3 × ca. 1.7 cm, membranous. Flowers white or yellowish. Calyx 2.5--3.2 cm, membranous, apex slightly 3-toothed. Corolla tube ca. 4.5 cm; lobes lanceolate, ca. 2 cm, central one cucullate, larger than lateral ones. Labellum purple dotted, ca. 2.5 cm; central lobe ovate, ca. 1.5 cm wide, apex 2--4-lobed; lateral lobes ovate, 6--8 mm, apex emarginate. Filament ca. 2 mm; anther 1.3--1.5 cm; connective appendage 1.2--1.4 cm. Ovary glabrous. Fl. Jun. 2 n = 22*.
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