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Perennating organs subterranean, tuberous, irregularly fusiform-conical or subglobose, 2–4 × 1.8–2.5 cm, white with brown nodes; roots fine, from base of new growth, 1 mm in diameter.
Leaves 5–6, erect, the basal 3 sheathing, 40–70 cm × 7–21 mm, oblanceolate, acuminate, grass-like, plicate, fairly well developed at flowering time.
Dorsal sepal 9.3–12 × 4–5.8 mm, ovate-elliptic, obtuse; lateral sepals 9–14 × 3–6 mm, obliquely ovate, acute.
Flowers bright yellow with yellow, orange or red papillae on lip, less commonly brown, crimson or purple.
Inflorescence densely many-flowered; scape covered by 7 papery pale brown sheaths; rhachis 4–13 cm long.
Petals 8–12 × 3.3–5 mm, obliquely elliptic, subacute to obtuse.
Column 4–4.7 mm long; foot 3–4.3 mm long.
Bracts 8–22 mm long, linear-aristate.
Terrestrial herb 50–100 cm tall.
Pedicel and ovary 12–21 mm long.
Fruit pendent, 18 mm long.
