墨脱石豆兰 mo tuo shi dou lan

Bulbophyllum yuanyangense Z. H. Tsi.

Pseudobulbs close, cylindric, 4-6.5 cm, 7-10 mm in diam., with a terminal leaf. Petiole 1-2 cm; leaf blade oblong, 13-21.5 × 3.5-4 cm, thickly leathery, base contracted into a petiole, apex acute. Scape from base of pseudobulb, erect, to 55 cm; raceme 9-10 cm, sparsely many flowered; peduncle 2-4 mm in diam., base with 2 or 3 tubular sheaths to 2.5 cm; floral bracts narrowly lanceolate, 5-8 mm, apex long acuminate. Pedicel and ovary 5-8 mm. Flowers green. Sepals free, ovate-lanceolate, ca. 15 × 6 mm, apex acuminate; dorsal sepal slightly shorter than lateral sepals. Petals broadly elliptic, 3-4 × 2.5-3.5 mm, margins ciliate, apex obtuse; lip oblong-lanceolate, thickly fleshy, grooved at adaxial base, margin glandular-ciliate, apex obtuse and retuse. Column stout, base dilated, with wings enlarged at base; foot short; stelidia subulate. Fl. unknown. 2n = 38.

Tree trunks in forests; 2000-2100 m. SE Xizang, NW and SE Yunnan [Bhutan, NE India].