Description from Flora of China
Orchis commelinifolia Roxburgh, Fl. Ind., ed. 1832, 3: 451. 1832 ["commelinaefolia"].
Plants 60-75 cm tall. Tubers ellipsoid, 5-8 × 3-5 cm, fleshy. Stem erect, stout, with 4-6 well-spaced leaves and several bractlike leaves above. Leaf blade narrowly oblong-lanceolate to linear-lanceolate, 7-15 × 1.5-2.5 cm, base contracted into amplexicaul sheath, apex acuminate. Raceme many flowered, 9-11 cm; floral bracts linear-lanceolate, ca. as long as or longer than flowers, margin ciliate, apex acuminate; ovary twisted, slender, including pedicel 3-4 cm. Flowers white. Dorsal sepal concave-hooded, broadly obovate, ca. 7 × 9 mm, 5-veined, apex acute; lateral sepals reflexed, strongly oblique, axe-shaped, ca. 7 mm, strongly dilated toward apex and ca. 13 mm wide, with 3 strongly curved veins. Petals connivent with dorsal sepal, obliquely oblong, subfalcate, ca. 6.5 × 4 mm, 2-veined, apex acute or obtuse; lip ca. 4 cm, with linear base 4-6 mm, then deeply 3-lobed, lobes filiform-linear; lateral lobes 2.5-3.2 cm; mid-lobe pendulous, 1.8-2.2 cm, slightly wider than lateral lobes; spur pendulous, cylindric-clavate, 5-8 cm, slender, near apex dilated, with a bristle projection on front margin of mouth; pollinia ellipsoid; caudicles linear; viscidia orbicular; stigmas clavate. Fl. Aug. 2n = 42.
Forests; 900-1200 m. SW Yunnan [India, Myanmar, Nepal, Thailand, Vietnam].