Plant 1–2 1/2 ft. high. Leaves cauline, elliptical, subacute, 1 1/2–4 in. long, 3/4–1 1/2 in. broad. Racemes 4–10 in. long, rather dense, many-flowered. Bracts oblong-lanceolate, acute, 3–5 lin. long. Pedicels 2–3 lin. long. Flowers green. Sepals ovate-oblong, obtuse, 1 1/4 lin. long. Petals oblong, obtuse, 1 1/4 lin. long. Lip fleshy, trilobed, 1 1/4 lin. long; side lobes oblong, obtuse, a little narrower and longer than the front lobe, slightly incurved; front lobe triangular, distinctly keeled in front; spur linear-oblong, obtuse, slightly curved, 1/2 lin. long. Stigmatic processes subsessile, rounded, obtuse, diverging. Anther channels very short or scarcely exserted. Rostellum minute and tooth-like.