A terrestrial herb 60–100 cm. tall. Perennating organs underground, tuberous, irregularly fusiform-conical or subglobose, 2–4 cm. tall, 1.8–2.5 cm. diameter, white with brown nodes; roots fine, from base of new growth, 1 mm. diameter. Leaves 5–6, erect, plicate, oblanceolate, acuminate, 40–70 cm. long, 1–2.1 cm. wide, basal 3 sheathing. Inflorescence densely many-flowered; peduncle covered by 7 papery pale brown sheaths; rhachis 4–13 cm. long; bracts linear-aristate, 8–22 mm. long. Flowers yellow with yellow, orange or red papillae on lip, less commonly brown or crimson; pedicel and ovary 12–21 mm. long. Dorsal sepal ovate-elliptic, obtuse, 9.3–12 mm. long, 4–5.8 mm. wide; lateral sepals obliquely ovate, acute, 9–14 mm. long, 3.8–5.2 mm. wide. Petals obliquely elliptic, subacute to obtuse, 8–12 mm. long, 3.3–5 mm. wide. Lip 3-lobed, 8–11.5 mm. long, 4–8 mm. wide; side lobes porrect, acute to rounded at apex; mid-lobe oblong, subquadrate or obovate, obtuse or truncate; callus of 2 basal ridges with long papillae over basal three-quarters of mid-lobe; spur shortly conical-cylindric, 1–3 mm. long. Column 4–4.7 mm. long; foot 3–4.3 mm. long. Fruit pendent, 18 mm. long. Pl. 4.