10. Luisia ramosii Ames, Philipp. J. Sci., C. 6: 55. 1911.
宽瓣钗子股 kuan ban chai zi gu
Stems often arching, ca. 28 cm, 4-5 mm in diam., internodes ca. 1.5 cm. Leaves mostly on upper part of stem, 8-11 cm × 3.5-4 mm, obtuse. Inflorescences opposite to leaves, ca. 1 cm, 3-6-flowered; floral bracts broadly ovate-triangular, ca. 2 mm, thickly leathery. Flowers opening widely, purplish red, thinly textured; pedicel and ovary ca. 8 mm. Dorsal sepal elliptic, ca. 5 × 3 mm, concave, obtuse; lateral sepals slightly oblique, oblong, ca. 6 × 3 mm, dorsally carinate and winged toward apex; wing abruptly contracted and protruding from apex forming an awn. Petals ovate, ca. 6.2 × 3.2 mm, obtuse; lip 6-6.5 mm, strongly contracted near middle, with a distinct boundary between epichile and hypochile; hypochile 5.5-7 mm wide, broader than epichile, concave; epichile somewhat reniform-triangular, 5-6.2 mm wide, entire, obtuse. Column ca. 3 mm; stipe ovate, ca. 0.8 mm; viscidium suborbicular, large, ca. 1.3 mm wide. Fl. May-Jun. 2n = 38, 40.
Epiphytic on tree trunks in open forests along valleys; 100-500 m. Guangxi, Hainan [Philippines, Vietnam].
Luisia trichorrhiza (Hooker) Blume was reported from Hainan (Merrill & Metcalf, Lingnan Sci. J. 21: 12. 1945) and Xizang (K. Y. Lang in C. Y. Wu, Fl. Xizang. 5: 776. 1987). The specimens reported from Hainan were identified by us as Luisia ramosii, and those of Xizang (Qinghai-Xiang Exp. Team 74-4223) remain doubtful, as they only bear young fruit.