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Information Leaves linear-lanceolate, acuminate. Scape a little longer than the leaves; raceme densely capitate. Sepals and petals not described. Lip cuneate, trifid; side lobes retrorse, obtuse-angled; front lobe with a narrow isthmus, dilated, obtuse-angled, denticulate and subemarginate at the apex, velvety near the base; disc with a pair of keels, which become fimbriate upwards, and bear some linear or filiform appendages in front.

Information Leaves linear-ligulate, acuminate, chartaceous, 6–7 lin. broad. Scapes tall, with the flowers distantly racemose above. Bracts triangular, setaceous, very short. Flowers yellow. Sepals triangular, short. Petals oblong, “very obtusely acute,” very large. Lip trilobed; side lobes short, erect, united to the column; front lobe, oblong, acute, convex with reflexed sides; disc with 9–11 granulate keels; spur slenderly conical, a little shorter than the front lobe of the lip.

Information Robust terrestrial herb 30–70 cm tall.Perennating organs subterranean, tuberous, 5–10 × 2–2.5 cm, potato-like, forming a long chain; roots 1.5 mm in diameter.Leaves 2–3, 30–80 × 1.5–5 cm, lanceolate, acute, ribbed, absent or just starting to develop at flowering time.Inflorescence short and dense, almost capitate, many-flowered; scape stout, with several loose, papery sheaths up to 10 cm long, sometimes overlapping.Pedicel and ovary 10–20 mm long; bracts 20–50 mm long, lanceolate, long acuminate, spreading or reflexed.Flowers lemon-yellow with a deep purple, orange or brown blotch on the mid-lobe of the lip, side lobes purplish.Sepals 28–40 × 10–16 mm, elliptic-lanceolate, acuminate, the laterals very slightly longer than the dorsal.Petals slightly shorter than the sepals, 28–35 × 10–14 mm, elliptic-lanceolate, acuminate.Lip 23–30 × 12–22 mm, 3-lobed; side lobes small, rounded; mid-lobe c. 15 × 15 mm, suborbicular, obtuse or emarginate; callus of 2 basal ridges turning to long papillae on the basal half of the mid-lobe.Spur 2–5 mm long, straight, conical to cylindrical.Column 6–7 mm long; foot 3 mm long.Capsule pendent, c. 20 mm long.