二色金石斛 er se jin shi hu

Rhizome creeping, 5-7 mm in diam., stout, internodes 3-6 mm. Stems pendulous or ascending, golden yellow, 3-7 mm in diam., usually branching. Pseudobulbs golden yellow, fusiform, slightly compressed, 3.5-5 cm × 13-17 mm. Leaf blade elliptic-lanceolate, 12.5-13.5 × 1.7-2.3 cm, leathery, apex subacute and slightly bilobed. Inflorescence 1-5-flowered; peduncle 2-4 mm, with several tufted scalelike sheaths. Flowers lasting nearly half a day, thinly textured; pedicel and ovary pale yellow, sepals, petals, and lip creamy white or white, with dense purplish red spots on basal half of dorsal sepal and throughout lateral sepals, mentum pale yellow, lamellae on disk tinged with yellowish green or purplish red, column tinged red at base and margin; pedicel and ovary ca. 5 mm. Dorsal sepal oblong, slightly concave, 12-15 × 4-5 mm, acute; lateral sepals oblong-lanceolate, similar in size to dorsal sepal, base broad and oblique; mentum nearly perpendicular to ovary, ca. 5 mm, obtuse. Petals oblong, ca. 10 × 3 mm, acute; lip obovate in outline, ca. 12 mm, base cuneate, margin 3-lobed; lateral lobes suberect, ovate-triangular, ca. 8 × 3 mm, slightly obtuse; mid-lobe somewhat batlike, 2-lobed; lobules subflabellate, erect, basal margin crisped undulate; disk with 2 lamellae extending from base to near base of mid-lobe; lamellae strongly crisped undulate in apical half. Column ca. 3 mm, stout; foot ca. 6 mm. Fl. Jun-Jul.

● Epiphytic on tree trunks in open forests; ca. 900 m. S Yunnan.