Stem ascending, to 1 m, stout, 1-1.3 cm in diam., internodes 2-3.5 cm. Leaves many, well spaced, distichous, ± spreading horizontally; leaf blade narrowly oblong, 13-20 × 2.5-3.4 cm, base amplexicaul-sheathing, apex obtuse and unequally bilobed. Inflorescences several, opposite to leaves, ascending, paniculate, 5-14 cm, with many short branches; each branch with 1 raceme and 2-6 flowers; peduncle 1-2 cm, 2-3 mm in diam.; floral bracts broadly triangular, ca. 1 mm, fleshy, acute. Flowers slightly fragrant; sepals and petals yellowish green with reddish brown transverse stripes and spots, lip white, spotted with purple-red, spur and anther cap yellow; pedicel and ovary yellowish green, ca. 4 mm, sparsely shortly hairy. Dorsal sepal obovate, ca. 6 × 3 mm, obtuse; lateral sepals slightly oblique, obovate-oblong, slightly smaller than dorsal sepal, obtuse. Petals oblanceolate, ca. 5 × 2.3 mm, obtuse; lip slightly 3-lobed; lateral lobes erect, deltoid, very small; mid-lobe reflexed, deltoid, ca. 2 × 2 mm, obtuse, with a short conic projection abaxially, adaxially with many small warts, margin slightly undulate; spur straight, ca. 3 × 2 mm, inside with dense white hairs. Column ca. 1.5 mm, stout, with short hairs; anther cap subspherical; caudicle oblanceolate, ca. 1 mm; viscidium oblong. Capsule cylindric or narrowly fusiform, 4-4.5 cm × 5-6 mm. Fl. Nov, fr. next Mar-Apr. 2n = 38.
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