Stems often pendulous, slightly compressed terete, to 50 cm or more long, stout, 7-10 mm in diam., internodes 1-3 cm. Leaves oblong, 10-20 × 2.5-5.5 cm, apex unequally bilobed. Inflorescence opposite to leaf, pendulous, racemose, 10-20 cm, densely many small flowered; floral bracts narrowly lanceolate, 4-5 mm. Flowers yellow with purplish brown spots and stripes, spur whitish; pedicel and ovary ca. 5 mm. Dorsal sepal ovate, 4-5 × ca. 2.5 mm, concave, obtuse; lateral sepals obliquely ovate, 4-5 × 2.5-3 mm, obtuse. Petals ovate, ca. 3 × 2 mm, obtuse; lip 3-lobed; lateral lobes erect, subovate-triangular, ca. 2.5 × 3 mm, obtuse; mid-lobe incurved, ± narrowly lanceolate, ca. 3 × 1 mm, fleshy, obtuse, adaxially with 2 lamellae fused with each other; spur perpendicular to ovary, globose, 5-7 mm, contracted at middle, apex dilated, upper adaxial surface inside with a bifid appendage on back wall and a small callus on front wall. Column ca. 3 mm; anther cap narrowed and beaked at apex. Capsule cylindric, 2-3 cm × 5-8 mm. Fl. Jul-Aug, fr. Sep-Oct. 2n = 38.
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