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Terrestrial herb, up to 400 mm tall. Posterior petal lobe as broad as anterior lobe. Midlobe of lip much longer than side lobes. Spur 13-20 mm long, distinctly curved. Flowers green and white.
Stem leafy; leaves 4–7, the upper ones bract-like, the lower ones set close together near base of stem, semi-erect, the largest 10–17 × 0.5–1.7 cm, the margins ± undulate.
Lip 3-lobed, with basal claw c. 2 mm long; mid-lobe 12–13 × 0.5–0.8 mm; side lobes 7.5–8 × 0.4 mm; all lobes linear; spur 18–23 mm long, sigmoid.
Dorsal sepal 5–6 × 1.5–2 mm, reflexed; lateral sepals 7–8 × 4 mm, obliquely obovate with lateral apiculum.
Petals 2-lobed almost to base; upper lobe 5.5–6.5 × 0.5 mm, linear, erect; lower lobe 10–11 × 0.8–1.2 mm.
Inflorescence to 15 × 3–5 cm, densely several-to many-flowered; bracts 12–14 mm long.
Flowers semi-erect, green, green and white or yellow-green.
Anther 3 mm high, canals 4.6–5.7 mm long.
Stigmatic arms 5.5 mm long, porrect.
Pedicel and ovary 20–25 mm long.
Terrestrial herb 30–40 cm tall.
