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Dorsal sepal erect, 10.5–12 × 4–8 mm, ovate, convex; lateral sepals sharply reflexed and curled, 10–11 × 2.5–4 mm, obliquely lanceolate.
Petals 7–12 × 1–3 mm, lanceolate, obtuse, usually with a small lateral lobe near the base, lying inside dorsal sepal.
Inflorescence 11–20 × 3.5–4 cm, laxly 2–12-flowered; ovary and pedicel c. 35 mm long; bracts of similar length.
Stem leafy; leaves 6–8, the two lowest sheathing, the rest semi-erect, up to c. 9 × 1.5 cm, lanceolate, acute.
A ± slender herb 40–65 cm tall, drying dark brown or almost black; tubers ellipsoid.
Anther 2.8–3 mm high; canals 3–4 mm long.
Spur 20–25 mm long, tucked into bract.
Stigmatic arms 3–5 mm long.
Flowers green.
