Rhizomes extensive, 3-5 mm. in diameter.. Leafy stems to 2.5 m. tall.. Leaves narrowly elliptic, up to 29 × 4.5 cm., acuminate, base cuneate, glabrous; veins closely spaced, 21-26 per 5 mm. above, 24-31 per 5 mm. beneath; ligule coriaceous, rounded, 1-2 mm. long, glabrous; sheaths sulcate, glabrous.. Inflorescences 2-4-flowered, arising from the rhizomes and from the base of the leafy shoots; peduncle 2-4(-10) cm. long; bracts broadly ovate to triangular, membranous to papery, up to 3.5 × 2.3 cm., glabrous except for the sparsely appressed pubescent apex.. Calyx spathaceous, ± 3 cm. long, split for about 1.5 cm. down one side, sparsely appressed pubescent outside.. Petals white, the posterior oblong, concave, ± 4.5 × 1.5 cm., the laterals narrowly triangular, ± 4 × 0.5 cm.. Labellum white with a basal yellow patch, 9 cm. long, the free portion broadly obovate, ± 5 × 4 cm.. Free filament ± 1.5 cm. long, ligulate; anthers subterminal, 10 mm. long, the basal 6 mm. dehiscent, glabrous; apex 3-lobed, the terminal lobe triangular, 3 mm. long, with 2 apical teeth, the laterals ± 3 mm. long, subulate.. Ovary glabrous; style appressed pubescent near the apex; stigma trumpet-shaped, pubescent outside.. Immature fruits hidden underground, subglobose; calyx persistent.. Mature fruits and seeds unknown.
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