Plant 1 1/2–2 ft. high. Stem leafy to the top. Leaves longer than the internodes, erect, their non-sheathing portion 3–3 1/2 in. long, 8–12 lin. broad, decreasing upwards, lanceolate-oblong or ovate-oblong, acute. Bracts 1–1 1/4 in. long, 5–6 lin. broad, lanceolate or oblong-lanceolate, acuminate. Dorsal sepal 6–7 lin. long, 4 lin. broad, erect, rhomboid, subacute, broadly boat-shaped; spur slender, 4 lin. long, 1/2 lin. thick, cylindric, pendulous. Lateral sepals spreading and ascending, 6 lin. long, 2 1/2 lin. broad, oblong, obtuse or subacute. Petals 4 1/2–5 lin. long, 2 lin. broad, unequally 2-lobed to the middle; the posterior lobe 2 1/2–3 lin. long, 1/2– 3/4 lin. broad, falcate-linear, obtuse or subacute; the anterior lobe much shorter than the posterior, broadly rounded, ear-shaped. Lip 5–6 lin. long, linear and less than 1/3 lin. broad, except at the base, where it is dilated to 1 lin. in breadth for about 1 lin. of its length, the dilated part ending in a tooth on each side. Anther erect, oblong, 2 1/2–3 lin. long. Rostellum short, with a fold between the anthers.