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Lip projecting, slightly recurved, 14–20 × 7–15 mm when flattened, 3-lobed, with a callus of 2 ridges in the basal half; side lobes erect, rounded; mid-lobe to 10 × 6 mm, oblong-flabellate, obtuse, covered with papillae 3–4 mm long.
Sepals and petals green with purple-brown net veining; lip side lobes green with purple veins, mid-lobe purple, the apex white, with long purple or white papillae.
Dorsal sepal 12–20 × 4–5 mm, oblong, acute, slightly keeled on the outside, semi-erect; laterals similar but slightly larger and oblique, spreading to projecting.
Leaves 3–4, usually developed at flowering time, 24–45 × 1–5 cm, erect, lanceolate or oblanceolate, plicate, the lowest sheath-like.
Perennating organs subterranean, tuberous, ellisoid, 2–2.5 cm long, 1–1.3 cm in diameter; roots 2 mm in diameter.
Column 7–9 mm long, arched; foot 3.5 mm long; anther cap with erect, bilobed appendage.
Bracts 10–60 mm long, linear-lanceolate, acuminate, spreading, sometimes scarious.
Inflorescence rather laxly 9–10-flowered; scape with 4–5 papery sheaths.
Petals 11–15 × 5–6 mm, oblong-elliptic, obtuse, lying over the column.
Pedicel and ovary 15–30 mm long, straight or slightly upcurved.
Terrestrial herb 60–125 cm tall.
Capsule pendent, 20–25 mm long.
Spur 2–2.5 mm long, conical.
