2n = [40]

2n = c. 40, 38–40

Plant at fl. to c. 60–90 cm. tall. Swollen rhizomes large, e.g. individual parts to 8 × 3 cm. Stem erect, stout or slender (2–7 mm. diam.). Scale lvs widely spaced. Fls us. < 20, ± drooping to bring dorsal sepal next to axis. Per. c. 10–16 × 4–8 mm., light brownish; lobes slightly thickened marginally. Lateral sepals connate almost to level of labellum-tip. Labellum ovate-oblong, rather shortly adnate to per.-tube; long median calli much crested; margin well-developed, undulate and ± lobed, membr. above, thickened below, confined to free limb. Column almost as tall as labellum, very narrowly winged throughout; anther short, operculate, filament smooth; stigma basal, far below anther.