聚株石豆兰 ju zhu shi dou lan

Cirrhopetalum sutepense Rolfe ex Downie, Bull. Misc. Inform. Kew 1925: 376. 1925.

Rhizome creeping, roots spreading. Pseudobulbs contiguous, pyriform or subglobose, 6-12 mm, 5-10 mm in diam., with a terminal leaf, wrinkled when dried. Leaf subsessile; blade oblong or oblong-ligulate, 1.5-4.5 × 0.6-0.9 cm, leathery, base cuneate, apical margins denticulate, apex acute or subobtuse. Scapes 1 or 2, from base of pseudobulb, slightly longer than pseudobulb, glabrous; raceme with shortened rachis, umbel-like, often 4- or 5-flowered; peduncle less than 5 mm, enclosed in 3 or 4 membranous sheaths; floral bracts ovate-lanceolate, ca. 4 mm, apex shortly acute. Flowers pale yellow, with free sepals. Dorsal sepal ovate-lanceolate, concave, 2.2-3 × ca. 1.8 mm, entire, shortly acute, apical margins slightly incurved; lateral sepals obliquely lanceolate, 5-6 × 1.5-1.8 mm, entire, margins in apical half incurved and tubular, apex long acuminate. Petals narrowly oblong, ca. 1.5 × 0.7 mm, entire, acute; lip recurved, nearly ovate-triangular, very small, shorter than petals, 3-lobed; lateral lobes erect, deltoid; mid-lobe narrowly oblong, apex subacute; disk densely papillate adaxially. Column ca. 1.1 mm, stout; stelidia deltoid to broadly triangular, ca. 0.1 mm; foot upcurved, ca. 1.4 mm, with free part ca. 0.8 mm; anther cap subglobose, slightly mucronate. Fl. May.

Tree trunks in mixed forests; 1200-1600 m. S Yunnan [Laos, N Thailand].