5. Luisia teres (Thunberg) Blume, Rumphia. 4: 50. 1849.
叉唇钗子股 cha chun chai zi gu
Epidendrum teres Thunberg in Murray, Syst. Veg., ed. 14, 818. 1784; Luisia botanensis Fukuyama; L. teres var. botanensis (Fukuyama) T. P. Lin.
Stems ascending or pendulous, to 55 cm, 3-5 mm in diam. usually unbranched, internodes 2.5-2.8 cm. Leaves facing all directions, 7-13(-20) cm × 2-2.5 mm, obtuse. Inflorescences borne from upper part of stem, ca. 1 cm, 1-7-flowered; floral bracts broadly ovate, ca. 2 mm. Flowers fleshy, greenish yellow or whitish, sometimes tinged with purple on abaxial surface and apex of sepals and petals, lip marked with purple or purplish brown, anther cap pale yellow; pedicel and ovary ca. 8 mm. Dorsal sepal ovate-oblong, 7.5-11 × 3-6 mm, obtuse; lateral sepals similar to but slightly longer than dorsal sepal, acute, dorsally carinate-winged and becoming winged at apex. Petals slightly falcate-elliptic, 7-13 × 2-4 mm, obtuse; lip 10-16 mm, thickly fleshy, without a distinct boundary between epichile and hypochile; hypochile slightly concave, base with subquadrate lateral lobes ca. 1 mm; epichile spreading, subovate, large, adaxially with a fleshy longitudinal ridge near apex, furcately bilobed; lobules subtriangular, entire, with finely papillate hairs. Column 3.5-4 mm; rostellum large, bilobed; stipe obovate, ca. 1.8 × 1.2 mm; viscidium transversely oblong, large, ca. 2.2 mm wide. Fl. Mar-May. 2n = 38.
Epiphytic on tree trunks in forests; 1200-1600 m. W Guangxi, SW Guizhou, W Sichuan, Taiwan, SE Yunnan [Japan, Korea].