Description from Flora of China
Habenaria yunnanensis Rolfe.
Plants 9-35 cm tall. Tubers oblong or ovoid, 1-2 × 1-1.5 cm, fleshy. Stem erect, terete, 3-5 mm in diam., glabrous, base with 1 or 2 tubular sheaths, with 3 or rarely 4(-6) leaves in a dense basal rosette, and with 1-5 bractlike leaves above. Leaf blade orbicular or ovate, 1.5-5 × 1.5-4 cm, slightly fleshy, base obtuse-rounded, abruptly narrowed and amplexicaul, apex obtuse or acute. Raceme 6-15 cm, loosely 7-20-flowered; floral bracts lanceolate, ca. 1/2 length of ovary, apex aristate; ovary twisted, slightly arching, fusiform, glabrous, including pedicel 1.3-1.8 cm. Flowers white. Dorsal sepal erect, broadly elliptic, ca. 4 × 4 mm, concave, abaxially keeled and toward apex pubescent, 3-veined; lateral sepals reflexed, lanceolate, 4-5 × ca. 2.5 mm, 3-veined, apex acute, abaxially and along margin pubescent. Petals linear, ca. 6 × 0.8 mm, base twisted, 1-veined, apex acute; lip spurred, deeply 3-lobed above base; lobes narrow, equal in width, stout; lateral lobes linear-cuneate, 8-9 × 0.8-1 mm; mid-lobe linear, ± subcylindric, ca. 7 × 0.7 mm, adaxially channeled; spur pendulous, slightly curved, clavate, 1.2-1.4 cm, longer than ovary, with 1 slightly incurved, subulate appendage at front margin of mouth; pollinia obovoid; caudicles nearly oblong, slender; viscidium ovate; stigmas clavate, apex papillate. Fl. Jun-Aug.
● Forests, grassy places in forests, shrubby grasslands; 1500-3000 m. Guizhou, W Sichuan, NW to SE Yunnan.