(Rchb.f.) Bolus, J. Linn. Soc., Bot. 25: 184 (1889)
Terrestrial herb 17–60 cm tall.Perennating organs subterranean, pseudobulbous, 2–3 × 2–2.5 cm, asymmetrically conical, forming chains; roots white, 2–4 mm in diameter.Leaves about 5, forming a fan, the lowest 2–3 sheath-like, 10–70 × 0.7–2 cm, linear-lanceolate, falcate in side view, not plicate, absent or just starting to develop at flowering time.Inflorescence rather laxly few- to many-flowered; peduncle with 2–3 sheathing bracts; rhachis slightly zigzag.Pedicel and ovary 13–20 mm long; bracts 4–11 mm long, lanceolate, acuminate.Sepals olive-brown; petals and lip dull pink, yellow or whitish, the lip with yellow ridges.Sepals 6.5–9.5 × 2.3–4.2 mm, oblong-elliptic, the laterals slightly larger than the dorsal.Petals 8–10.6 × 3–7.8 mm, ovate-elliptic to suborbicular, concave.Lip 7–10 mm long, 3-lobed; side lobes erect, rounded or truncate, attached to the base of the column; mid-lobe 4.5–7 × 3–5.5 mm, suborbicular or elliptic, obtuse or emarginate, with a callus of 3–5 fleshy, verrucose ridges; spur 3–5 mm long, conical.Column 1–3 mm long, lacking a foot.