23. Habenaria medioflexa Turrill, Bull. Misc. Inform. Kew. 1923: 118. 1923.
版纳玉凤花 ban na yu feng hua
Habenaria trichochila Rolfe ex Downie.
Plants 30-48 cm tall. Tubers oblong, 2.5-3 × 1.5-2 cm, fleshy. Stem erect, terete, stout, with 4 or 5 leaves and 3-7 bractlike leaves above. Leaf blade narrowly elliptic, oblong, or lanceolate, 5-15 × 1.7-5 cm, base contracted into amplexicaul sheath, apex acuminate or acute. Raceme 9-18-flowered, 9-15 cm; floral bracts lanceolate to linear-lanceolate, 2-3 cm, apex acuminate; ovary twisted, arching, cylindric-fusiform, including pedicel 2.2-2.5 cm. Flowers with yellowish green sepals and white petals and lip. Dorsal sepal concave-hooded, ovate, ca. 6 × 4 mm, 3-veined, apex obtuse; lateral sepals spreading, obliquely ovate, ca. 7 × 5 mm, 3-veined, apex acute. Petals forming a hood with dorsal sepal, linear, ca. 5 × 0.5 mm, 1-veined, apex acuminate; lip spurred at base, 3-lobed above base; lateral lobes ca. 1.4 cm, divided into many filiform lobules; mid-lobe linear, ca. 1 cm, unlobed; spur pendulous, yellowish green, cylindric, to 3.5 cm, much longer than ovary, thickened and geniculate-curved near middle; stigmas globose. Fl. Sep.
Forests; 700-800 m. S Yunnan [Thailand, Vietnam].