8. Luisia zollingeri H. G. Reichenbach, Ann. Bot. Syst. 6: 622. 1863.
长叶钗子股 chang ye chai zi gu
Stems erect or arching, to 30 cm, 5-7 mm in diam., sometimes branched, internodes 1.5-2 cm. Leaves usually borne from upper part of stem, 12-17 cm × 3-4 mm, obtuse. Inflorescences opposite to leaves, ca. 1 cm, 3-6-flowered; rachis ca. 7 mm, thick; floral bracts broadly ovate-triangular, ca. 2 mm, fleshy. Flowers opening widely, sepals and petals pale pink, abaxially lateral sepals yellowish green in basal half, lip purple-red, apical margin green, abaxially yellowish green, column purplish red, anther cap yellow; pedicel and ovary green, ca. 6 mm. Dorsal sepal ovate, ca. 4 × 3 mm, obtuse; lateral sepals subovate, ca. 6 × 2.8 mm, dorsally slightly carinate, but winged toward apex and forming a narrowly winged mucro protruding from apex. Petals obovate-elliptic, ca. 5 × 3.2 mm, obtuse; lip ca. 5 × 4.5 mm, without a distinct boundary between epichile and hypochile; hypochile broader than epichile, concave, with 2 small lateral lobes, and a pair of calli at base bordering base of column; epichile suborbicular, glabrous, entire. Column ca. 2.5 mm, thick. Fl. May.
Epiphytic on tree trunks in forests along valleys; 500-1000 m. S Yunnan [India (Andaman Islands), Indonesia, Malaysia, Thailand, Vietnam].