二叶石豆兰 er ye shi dou lan

Rhizome creeping, ca. 3 mm in diam., densely with tubular sheaths, rooting from base of pseudobulbs. Pseudobulbs 1-2 cm apart from each other, ovoid, 7-14 mm in diam., with 2 leaves at apex. Leaves deciduous at anthesis, subsessile; leaf blade obovate-lanceolate, 3-7 × 1-2.1 cm, leathery, apex rounded and emarginate. Scape from base of leafless pseudobulb, erect, 11-17 cm; raceme 6-10 cm, densely with many secund flowers, peduncle ca. 1.5 mm in diam., glabrous, with 5 tubular sheaths; floral bracts lanceolate, small, ca. 3 mm, apex acuminate. Pedicel and ovary 4-5 mm. Flowers pale yellow. Sepals free, ovate-lanceolate, 3-veined, apex obtuse; dorsal sepal ca. 4.5 × 1.6 mm; lateral sepals ca. 5.5 × 3 mm, base ca. 1/2 width adnate to column foot. Petals ovate-lanceolate, ca. 4 × 1.3 mm, entire, acute or mucronate; lip reflexed, ± conduplicate, ca. 3 mm, fleshy, adaxially with 1 longitudinal keel, apex obtuse, ciliate. Column ca. 1.8 mm; foot ca. 1.5 mm, with free part ca. 0.3 mm; stelidia deltoid, ca. 0.8 mm; anther cap densely finely papillate, centrally with 1 globose projection. Fl. Oct.

Rocks in forests; 1800-1900 m. SW Yunnan [Myanmar].