Terrestrial, with stout rhizome. Leaves radical, narrowly lanceolate, acute or acuminate, 1/2–1 1/4 ft. long, narrowed below into a long petiole. Scape 2 1/2–2 3/4 ft. high, with numerous, long, imbricate sheaths, the lower obtuse, the upper acute. Bracts lanceolate or ovate-lanceolate, acuminate, 7–9 lin. long. Sepals and petals oblong or elliptical-oblong, subobtuse or minutely apiculate, 5–6 lin. long. Lip sessile, trilobed, ecalcarate; side lobes divaricate, broadly oblong, obtuse, very slightly curved, 3 lin. long; front lobe quadrate-elliptic or broadly elliptic-oblong, obtuse, flat; disc with about five to seven tuberculate keels, and a pair of rounded calli in the angle between the lip and column. Column broad, 2 lin. long.