Plants heteromycotrophic, without green leaves, (15-)40-80 cm tall. Pseudobulb subterranean, tuberous, pale yellow, suboblong, 3-16 × 1.5-5 cm, many noded, with many stout roots. Inflorescence brownish red, racemose, (15-)40-80 cm, stout, with several scattered, clasping sheaths; rachis 4-13 cm, laxly 8-to more than 20-flowered; floral bracts narrowly lanceolate to almost subulate, 10-25 mm, subequal in length to or exceeding ovary, apex acuminate. Flowers suberect, spreading, or nodding, dull purple-red to brownish yellow, medium-sized, 25-30 mm in diam.; pedicel and ovary 16-20 mm. Dorsal sepal elliptic-oblong, 15-23 × 4-7 mm, apex acuminate; lateral sepals suboblong, slightly oblique, 16-25 × 6-9 mm, adnate at base to column foot, apex acuminate. Petals oblanceolate, 11-18 × 5-7 mm, apex mucronate; lip adnate to column foot, subobovate or oblong-obovate, 14-15 × 15-18 mm, shortly saccate-spurred at base, 3-lobed; lateral lobes erect and loosely embracing column, subovate or oblong, 3-4 × ca. 4.5 mm, apex rounded; mid-lobe ovate, 4-7 × 3-5 mm, with 5-7 thickened, papillose veins, margin undulate, apex apiculate; disk sparsely papillose, with 2 central, suborbicular lamellae; spur broad, conic, ca. 2 mm. Column ca. 5 mm; column foot 4-5 mm. Fl. Apr-May. 2n = 34.
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Plants leafless. Root system large, tuberous, globose with thick, fleshy roots. Flower stem fleshy with pointed bracts, 500–900 mm tall, brownish, 6–40-flowered. Flowers 40–50 × 50–60 mm, brownish or dark red-brown with a dark red to purplish labellum that is green at base and yellow outside. Dorsal sepal 30–34 × 11–14 mm, incurved. Lateral sepals 32–36 × 10–13 mm, widely spreading, horizontal. Petals 20–23 × 8–10 mm, projected forwards or incurved. Labellum quadrangular, 18–22 × 17–20 mm, 3-lobed; lateral lobes entire, erect; midlobe pointed, decurved, covered with short, thick hairs; spur pouch-like with papillate ribs. Column pale yellow.
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