A terrestrial herb 3–7.5 dm. high.. Tubers ellipsoid, 1.5–3 cm. long, 8–15 mm. in diameter, woolly.. Stem erect, rather stout, leafy.. Leaves 6–8, the lowermost 1 or 2 sheath-like, the remainder lanceolate, ovate-lanceolate or ovate, very acute, the largest 6–20 cm. long and 2.5–8 cm. broad, decreasing in size towards the inflorescence, the uppermost similar to the bracts.. Inflorescence 8–27 cm. long, 6–10 cm. in diameter, rather laxly 4–17-flowered.. Bracts lanceolate or broadly lanceolate, acuminate, the lowest ones equalling or longer than the flowers.. Flowers suberect, sepals pale green, petals and lip white, often fragrant; pedicel with ovary 2.5–3 cm. long.. Dorsal sepal erect, broadly lanceolate or lanceolate-elliptical, apiculate, 2–3 cm. long, 9–15 mm. broad; laterals spreading, very obliquely lance-olate, acuminate, a little longer than the dorsal but narrower.. Petals erect, adherent to the dorsal sepal, very curved, ligulate or lanceolate-ligulate, often angled on the outside below the middle, as long as the dorsal sepal, 5–9 mm. broad.. Lip with a narrow undivided claw 7–13 mm. long, then deeply 3-lobed, the claw and lobe-bases densely pubescent; middle lobe often ± deflexed, linear, 2–3 cm. long, 1–2 mm. broad; side lobes diverging, a little longer than the middle lobe with 6–12 threads on the outer margins.. Spur incurved, ± S-shaped, swollen in apical part, 3–4 cm. long.. Anther-connective horseshoe-shaped, 3–4 mm. high and 11–18 mm. broad, loculi at each end, canals erect, slender, 4–6 mm. long, auricles with slender stalk and ellipsoid apex.. Stigmas united to rostellum side lobes in lower half, receptive terminal parts somewhat swollen, 5–7 mm. long, middle lobe of rostellum scarcely recognizable, very broad and short.
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Lip 25–40 mm long, 3-lobed with a basal claw 7–13 mm long, the claw and base of lobes densely pubescent; mid-lobe 15–23 × 1 mm, linear; side lobes 18–24 mm long, fimbriate towards the apex with 8–12 branches c. 7 mm long; spur 25–50 mm long, sigmoid, slightly swollen at apex, pendent.
Leaves 6–12, the 2 lowermost sheathing, the mid-cauline largest and up to 20 × 6 cm, ovate, acute, loosely funnel-shaped at base, dark green with 3 prominent longitudinal veins.
Dorsal sepal 23–30 × 12–13 mm, ovate, erect; lateral sepals 22–31 × 8–10 mm, obliquely ovate, spreading.
Stigmatic arms 16–20 mm long, joined to the side lobes of the rostellum in the basal half.
Robust terrestrial herb 35–70 cm high with ovoid or ellipsoid tubers 3–4 cm long.
Inflorescence 10–22 × 7–9 cm, fairly laxly 4–20-flowered; bracts up to 6 cm long.
Anther connective 12–18 mm wide, 3–4 mm high; canals 4–6 mm long, erect.
Petals 20–30 × 4–8 mm, falcate, entire, adnate to dorsal sepal.
Ovary and pedicel erect, slightly arched, 25–35 mm long.
Sepals green, petals and lip white.
Staminodes stalked, c. 2 mm long.
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