二叶玉凤花 er ye yu feng hua

Habenaria humistrata Rolfe ex Downie; Liparis diphyllos Nimmo.

Plants 7-25 cm tall. Tubers ovoid or ellipsoid, 0.5-1.5 cm, fleshy. Stem erect or ascending, terete, glabrous, with 2 nearly opposite leaves at base and 2-5 bractlike leaves above. Leaf blade cordate or nearly reniform, 1.2-3.5 × 1-5 cm, base contracted into amplexicaul sheath, apex acute. Raceme loosely 1- to several flowered; rachis glabrous; floral bracts ovate-lanceolate, 4-7 mm, shorter than ovary, apex acuminate; ovary twisted, terete, including pedicel 10-11 mm, glabrous. Flowers greenish white, small. Dorsal sepal forming a hood with petals, erect, ovate, concave, ca. 5 × 4 mm, 1-veined, apex obtuse-rounded; lateral sepals reflexed, oblong, ca. 6 × 3 mm, 3-veined, apex acute. Petals straight, linear-lanceolate, ca. 5 × 1 mm, 1-veined, apex acute; lip 13-15 mm, from base deeply 3-lobed, lobes filiform; lateral lobes longer than mid-lobe, 13-15 mm, often curled upward toward apex; spur pendulous, subclavate, 5.5-9 mm, shorter than ovary, apex subacute; stigmas narrowly clavate. Fl. Jun. 2n = 42, 42 + 2B, 108.

Damp places and on rocks in forests along valleys; 1000-1400 m. S Yunnan [N India, Thailand].