Rhizomatous herbs. Leafy stems up to 2 m. Leaf sheaths open on one side; blades distichosly arranged, sessile, up to 15 x 1.5 cm, ligule 2-4 mm long, membranous. Peduncle up to 25 cmlong. Inflorescence 4-5 x about 2 cm. Bracts about 2.5 x 2 cm, green. Corolla-tube about 2.5 cm long; lobes dull yellow, up to 2 x 1 cm; labellum dull dark purple.