Bulbophyllum stenobulbon E. C. Parish & H. G. Reichenbach, Trans. Linn. Soc. London. 30: 153. 1874.短足石豆兰 duan zu shi dou lan

Bulbophyllum clarkeanum King & Pantling; B. youngsayeanum S. Y. Hu & Barretto; Phyllorkis stenobulbon (E. C. Parish & H. G. Reichenbach) Kuntze.

Rhizome creeping or straggling, 1-1.5 mm in diam., branched, rooting from base of pseudobulbs, roots spreading. Pseudobulbs 1.5-3 cm apart from each other, ovoid-cylindric, usually 1-1.5 cm, 3-6 mm in diam., with a terminal leaf. Petiole 2-3 mm; leaf blade oblong, 1.5-3.3 × ca. 1 cm, leathery, apex obtuse-rounded and slightly emarginate. Scapes 1 or 2, from base of pseudobulb, filiform, 2-3.5 cm, slightly longer than pseudobulb; raceme shortened, umbel-like, often 2-4-flowered; peduncle with 3 or 4 tubular sheaths; floral bracts ovate-lanceolate, 2-3 mm, apex acute. Pedicel and ovary 2.5-3.5 mm. Flowers yellowish, tinged with orange-yellow on lip and apical half of sepals and petals. Sepals free, thickly textured; dorsal sepal narrowly lanceolate, 4.5-5 × 1.3-1.5 mm, apical margins ± incurved, apex long acuminate; lateral sepals similar to but slightly longer than dorsal sepal, base adnate to column foot forming a mentum. Petals ovate, 2-2.4 × 0.8-1 mm, thinly textured, entire, subobtuse; lip spreading horizontally, ligulate or ovate-lanceolate, ca. 2 × 0.5-0.7 mm, fleshy, grooved at base, abaxially densely finely papillate, adaxially often with 3 longitudinal ridges, lateral ridges often thickened and raised, apex rounded or subtruncate, slightly recurved. Column ca. 1.1 mm, stout; stelidia subulate, ca. 0.5 mm; foot slightly upcurved, 1-1.3 mm, with free part ca. 0.3 mm; anther cap subglobose, apex mucronate. Fl. May-Jun. 2n = 38.

Tree trunks or rocks in forests; 1200-2100 m. S and W Guangdong, SW Guizhou, SE Yunnan [Bhutan, India (Sikkim), Laos, Myanmar, Thailand, Vietnam].