A terrestrial herb 1.5–3.5 dm. high, glabrous except for the roots and petals.. Tubers globose to ovoid or ellipsoid, 1–1.5 cm. long, 0.5–1 cm. in diameter.. Stem erect, slender, leafy throughout its length.. Leaves 5–8, the lowermost 1 or 2 reduced to sheaths, the remainder suberect or somewhat spreading, ovate-lanceolate to lanceolate, acute, decreasing in size up the stem, the largest 1.5–3.5 cm. long, 0.4–1 cm. broad, the uppermost similar to the bracts.. Inflorescence 2–14 cm. long, 3.5–5 cm. in diameter, rather loosely 2–9-fiowered.. Bracts lanceolate, acuminate, 1–2.5 cm. long, usually shorter than the pedicel with ovary.. Flowers suberect or curving outwards, green with whitish centre; pedicel with ovary ± curved, 1.5–2.5 cm. long.. Dorsal sepal erect, convex, elliptical, obtuse, 10–13 mm. long, 6–8 mm. broad; laterals spreading, adnate to the column and base of the lip, obliquely lanceolate or lanceolate-elliptical, subacute, 9–12.5 mm. long, 4–6 mm. broad.. Petals erect, bifid in the upper part; basal undivided part ligulate, widened gradually upwards, 5–6 mm. long; posterior (upper) lobe erect, adherent to the dorsal sepal, lanceolate, subacute, 6–8.5 mm. long, ± 3 mm. broad, margins ciliolate; anterior lobe projecting above the dorsal sepal, linear, rather fleshy, 16–21 mm. long, scarcely 1 mm. broad, glabrous.. Lip united in the lower part to the column; free part tripartite from an undivided base 3–5.5 mm. long; middle lobe ± deflexed, linear, 7–10 mm. long, 2 mm. broad; side lobes diverging forwards, narrowly linear, 13–16 mm. long, less than 1 mm. broad.. Spur with base parallel to the ovary, then curved forwards and upwards into a complete loop, the apex projecting backwards, slightly swollen in the apical half, 2–3 cm. long.. Column consisting of a low horseshoe-shaped connective ± 2 mm. high and 7–11 mm. long surrounding the mouth of the spur, the loculi at each end reclinate, 2–3 mm. long, the canals scarcely developed; stigmas porrect, rather stout, widened and truncate at the apex, 3–4 mm. long.
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Lip 3-lobed with a basal undivided part 3–5.5 mm long; mid-lobe deflexed, 7–10 × 2 mm, linear; side lobes deflexed or projecting forwards and diverging, 13–15 × 0.8–0.9 mm, linear; spur 20–30 mm long, curved forwards and up, forming a complete loop, somewhat swollen near apex.
Petals 2-lobed with an undivided basal part 4–6 mm long; posterior lobe 8–12 × 3–4 mm, adnate to dorsal sepal; anterior lobe erect, 16–21 × c. 1 mm, linear, glabrous, fleshy.
Dorsal sepal erect, 11–12 × 6–8 mm, elliptic, obtuse; lateral sepals spreading, partly adnate to column and base of lip, 10–12 × 4–6 mm, obliquely lanceolate.
Leaves 5–9, the lowermost 1–2 sheathing, the next few suberect, 1.5–3.5 × 0.5–1 cm, lanceolate; the upper ones becoming bract-like.
Anther loculi 2–3 mmlong, reclinate, joined by a U-shaped connective 2 mm high and 11 mm long; canals very short.
Inflorescence to about 12 × 4 cm, laxly 2–9-flowered; bracts usually slightly shorter.
Stigmatic arms porrect, 3–4 mm long, enlarged and truncate at apex.
Pedicel and ovary 15–25 mm long, arched.
Tubers 1–1.5 × 0.5–1 cm, ovoid, woolly.
Slender terrestrial herb 15–35 cm tall.
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