小花钗子股 xiao hua chai zi gu

Mesoclastes brachystachys Lindley, Gen. Sp. Orchid. Pl. 45. 1830; Luisia siamensis Rolfe ex Downie.

Stems suberect, to 18 cm, stout, ca. 7 mm in diam., internodes 1-1.5 cm. Leaves 9-11 cm × 3-4 mm, obtuse. Inflorescences 2 or 3, ca. 1 cm, 3-6-flowered; rachis 3-4 mm in diam.; floral bracts ovate-triangular, ca. 2 mm, fleshy. Flowers opening widely, sepals and petals yellowish green, abaxial midvein purplish brown, lip pale yellow, column green, purple margined, anther cap yellow spotted with purple; pedicel and ovary pale yellow, tinged with purplish brown, ca. 6 mm. Dorsal sepal ovate, ca. 4 × 2.3 mm, obtuse; lateral sepals ovate-oblong, 4-4.5 × ca. 2.5 mm, dorsally slightly carinate and keel becoming winged at apex, apex obtuse. Petals narrowly oblong, 5-6 × 1.6-1.8 mm, obtuse; lip ca. 5 mm, glabrous, without a distinct boundary between epichile and hypochile; hypochile concave, narrower than epichile, base without distinct lateral lobes; epichile nearly suborbicular or triangular-rhombic, ca. 3 × 4.5 mm, obtuse. Column ca. 2.5 mm, stout. Fl. Apr. 2n = 40.

Epiphytic on tree trunks in forests along valleys; 600-1300 m. S Yunnan [Bhutan, India, Laos, Myanmar, Vietnam].