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Lip 3-lobed, with an undivided base c. 4 mm long; mid-lobe 15–28 × 2.5–6 mm, oblong, obtuse; side lobes 20–32 × 4–7 mm, the inner edge straight, the outer curved; the apex acute; spur 13–17 cm long, pendent, inflated in apical third.
Leaves 7–10, the lowest 1–2 sheath-like, the mid-stem leaves erect or semi-spreading, the largest 6–14 × 1–3.5 cm, lanceolate, acute; the upper ones bract-like.
Petals 2-lobed almost to base; upper lobe 11–16 × 1.5–3 mm, linear, adnate to dorsal sepal; lower lobe deflexed, 20–32 × 3.5–5.5 mm, lanceolate, acute.
Inflorescence 8–28 × 7.5–10 cm, rather laxly 2 to several-flowered; bracts leafy, to 8 cm long, shorter than the pedicel and ovary.
Dorsal sepal erect, 11–16 × 10–11 mm, ovate, acute, convex; lateral sepals deflexed, c. 20 × 9 mm, obliquely semi-ovate.
Robust terrestrial herb 40–80 cm tall; tubers 2–4 × 1–2 cm, ovoid or ellipsoid.
Pedicel c. 6.5 cm long, ovary 2.5–3 cm long, minutely hairy on ribs.
Flowers showy, scented, sepals green, petals and lip white.
Stigmatic arms 8–12 mm long, porrect, club-shaped.
Flowers large, white, up to 12, in narrow racemes.
Rostellum mid-lobe 4 mm high, triangular, acute.
Anther erect, 7–9 mm high; canals 3–5 mm long.
A slender terrestrial herb 1-4 ft. high
Stem leafy.
