环唇石豆兰 huan chun shi dou lan

Rhizome patent to pendulous, with roots creeping alongside it toward base. Pseudobulbs close or ± spaced, ± curved, subcylindric or ovoid, ca. 1 cm, with a terminal leaf. Leaf subsessile; blade narrowly oblong or ligulate, 25-43 × 4-7 mm, apex acute. Scape from base of pseudobulb or node of rhizome, very short; peduncle less than 5 mm; raceme dense with several small flowers, and scalelike sheaths at base; floral bracts membranous, longer than pedicel and ovary, ca. 4 mm, apex acute. Flowers brownish red. Sepals free, thickly textured; dorsal sepal ovate-lanceolate, 2.2-6 × ca. 1 mm, apex acuminate; lateral sepals obliquely ovate-triangular or falcate-lanceolate, 2.3-7 × ca. 1 mm, base adnate to column foot forming a mentum, margins strongly incurved above middle, apex long acuminate. Petals oblong, 1.2-1.8 × 0.5-0.8 mm, membranous, margins irregularly denticulate, apex acute; lip hooked-recurved, ca. 1.3 × 0.3 mm, fleshy, base connected to end of column foot by a mobile joint, margins densely white villous, apex obtuse; disk with 2 keels. Column ca. 0.6 mm; foot ca. 1 mm, with free part ca. 0.3 mm; stelidia fusiform, ca. 0.8 mm; anther cap glabrous, centrally with 1 ridge. Fl. Mar-Sep.

Tree trunks in open forests; 1100-1600 m. S and SE Yunnan [Myanmar, N Thailand, Vietnam].