Plants 20–100 cm or more. Corms globose, 8–22 mm. Leaves: blade strongly curled transversely, linear, 25–50 cm × 3.5–15 mm. Inflorescences green or seldom slightly purple at base, becoming entirely green after flowering, 20–100 cm or more; floral bracts ovate to ovate-lanceolate, subulate, 3–12(–30) mm. Flowers 1–20(–25); dorsal sepal 18–25 × 5–10 mm; lateral sepals sometimes reflexed distally, often narrowed, 15–20 × 7.5–13 mm, apex acuminate; petals 18–25 × 5–10 mm; lip 12–23 mm, dilated end of middle lobe paler color than rest of flower, narrowly anvil-shaped to triangular, 5.5–16 mm wide; column 15–25 × 1.5–2 mm, distal end 4.5–8 mm wide; rostellum absent or present. Capsules ovoid to ellipsoid, 15–25 × 5–8 mm. 2n = 40.
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