Stems erect, cylindric or sometimes with several nodes dilated and fusiform above base, to 80 cm, 2-20 mm in diam., rigid, usually branching, internodes to 4.7 cm, with longitudinal channels or stripes, deep yellow or orange when dry, glossy. Leaves often 3-6, alternate on main stem and upper part of branches, linear, 2.5-7 × 0.3-0.6(or more) cm, with leathery sheaths at base, apex obtuse and unequally bilobed. Inflorescence 1-2.5 cm, 1-or 2-flowered raceme; peduncle 5-10 mm; floral bracts ovate, ca. 2 mm, membranous, apex acute. Pedicel and ovary pale yellowish green, 12-15 mm; ovary slightly dilated; many clones ± cleistogamous. Normal flowers slightly fragrant, spreading, thickly textured; sepals and petals golden yellow, lip golden yellow, lateral lobes with a few red striations inside, disk often pale green. Dorsal sepal ovate-elliptic, (10-)18-24 × (3.5-)5-8 mm, 7-veined, apex acute; lateral sepals ovate-lanceolate, ca. as long as dorsal sepal, but slightly narrower, 7-veined, apex acute; mentum broadly conic, ca. 5 mm. Petals obliquely obovate or subelliptic, ca. as long as dorsal sepal and broader, 7-veined, apex acute; lip 10-20 mm long and wide, with a basal callus, middle 3-lobed; lateral lobes embracing column, ± subrounded, apex rounded; mid-lobe suboblate or ensiform-rounded, acute; disk with short, dense papillae between lateral lobes and extending to mid-lobe. Column ca. 5 mm, base slightly dilated, foot ca. 6 mm; column teeth subtriangular, apex short and obtuse; anther cap obliquely conic, surface smooth, front with 3 ridges, front margin denticulate.
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