Douglas ex Lindl., Gen. Sp. Orchid. Pl. : 528 (1840)
A terrestrial herb 25-70 cm tall, growing from a short stout rhizome. Stem erect, leafy, somewhat flexuous, covered below by several tubular sheaths, four- to seven-leaved above, glandular- pubescent. Leaves spreading-ascendent, plicate, broadly ovate to elliptic-lanceolate, obtuse to shordy acuminate, 5-16 cm long, 2.5-8 cm wide, glandular-pubescent on the veins, glandularciliate. Inflorescence one- to three-flowered; peduncle 6-11 cm long, glandular-pubescent; bracts foliaceous, ovate-elliptic to broadly elliptic, acute to acuminate, 4-8.5 cm long. Flowers showy, with maroon-brown sepals and petals and a white lip, the staminode yellow with red spotting, well-spaced on rhachis; pedicel and ovary 2-3.6 cm long, densely glandular-pubescent. Dorsal sepal ascending- suberect, lanceolate to ovate-lanceolate, long-acuminate, 3-6.5 cm long, 1-1.5 cm wide, the margins somewhat undulate, pubescent on outer surface; synsepal elliptic-lanceolate, bidentate at acuminate apex, 3-6.5 cm long, 0.8-1.5 cm wide, pubescent on outer surface. Petals deflexed at 45° to horizontal, linear to linear-lanceolate, acuminate, 4.5-7 cm long, 0.3-0.6 cm wide, spirally twisted two to three times, pilose on inner surface. Lip obliquely ellipsoidal, somewhat boat-shaped, 2-3 cm long, 1.3-1.7 cm across, pilose within, the mouth small. Column short, c. 1 cm long; staminode ovate-oblong to trullate, subacute, 0.8-1.2 cm long, 0.5-0.6 cm wide, longitudinally conduplicate, glabrous.