小花钗子股（中国兰花全书）
Luisia brachystachys (Lindl.) Bl., Rumphia 4: 50. 1848; Lindl., Fol. Orch. Luisia: 3. 1853; Rchb. f. in Walp. Ann. Bot. Syst. 6: 622. 1863; Hook. f., Fl. Brit. Ind. 6: 23. 1890; Seidenf. in Dansk Bot. Ark. 27 (4): 75, fig. 1971, et in Opera Bot. 95: 278, fig. 179. 1988; Averyanov, Vasc. Pl. Syn. Vietnam. Fl. 1: 118. 1990; Seidenf., l. c. 114: 436. 1992; Averyanov, Iden. Guide Vietnam. Orch.: 334. 1994; 植物分类学报 33 (3): 294. 1995; 中国兰花全书: 63. 1998. ——L. zollingeri auct. non Rchb. f.: Z. H. Tsi, S. C. Chen et K. Mori, Wild Orch. China: 105, pl. 221. 1997.
Epiphytic on tree trunks in forests along valleys; 600-1300 m. S Yunnan [Bhutan, India, Laos, Myanmar, Vietnam].
本种十分近似于长叶钗子股 Luisia zollingeri Rchb. f., 区别在于本种的花瓣狭披针形，比萼片长，唇瓣的后唇在基部两侧无明显的耳。
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Stems suberect, to 18 cm, stout, ca. 7 mm in diam., internodes 1-1.5 cm.Leaves 9-11 cm × 3-4 mm, obtuse. |
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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.
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