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Leaves 10–20, well spaced up the stem, the lowermost usually sheathing, the next 6–10 suberect, the largest 7–23 × 1–2 cm, linear or lanceolate, glossy green with 3 prominent longitudinal veins; the upper leaves appressed to stem and bract-like.
Lip 3-lobed almost to base; mid-lobe 11–15 mm long; side lobes 10–13 mm long; all lobes linear, less than 1 mm wide; spur 15–30 mm long, slender, inflated at apex, with 1 twist in the middle, parallel to pedicel and ovary or slightly incurved.
Terrestrial herb, up to 500 mm tall. Dorsal sepal 7-8 mm long. Posterior petal lobe without a tooth, anterior petal lobe up to twice the length of posterior lobe. Flowers green with a pale centre.
Inflorescence 10–35 × 5–6 cm, laxly to fairly densely several-to many-flowered; bracts 15–30 mmlong, glandular at the base, scarious at the tips, the lowest about as long as the pedicel and ovary.
Petals 2-lobed almost to base, slightly ciliolate; upper lobe 5–7.5 × 0.5–1 mm, linear, curving back; lower lobes pendent, hinged, 9.5–14 × 1.5–2.5 mm, lanceolate, acute.
Sepals reflexed, somewhat scarious after flowers open; dorsal sepal 5–7.5 × 2–3 mm, elliptic; lateral sepals 7–10.5 × 5–7 mm, obliquely obovate with a lateral apiculum.
Pedicel and ovary 20–30 mm long, straight or slightly arched, spreading, the ovary usually longer than the pedicel.
Anther 3.5–4 mm high; canals 4–7 mm long, porrect, curving up at tips.
Stigmatic arms 4.5–6 mm long, porrect, truncate at apex.
Rostellum mid-lobe 2.5–3 mm long, narrowly triangular.
Tubers 1.5–2.5 × 1 cm, ellipsoid, woolly.
Robust terrestrial herb to 100 cm tall.
Flowers green, white in centre.
Stem leafy.
