A terrestrial herb 3–8 dm. high, glabrous except for the roots.. Tubers ovoid or nearly spherical, 1–2 cm. long, 0.8–2 cm. in diameter, densely tomentose.. Stem erect, rather slender, leafy along nearly its whole length.. Leaves 9–13, suberect or ± spreading, the lowermost 2–4 sheath-like, the middle ones lanceolate or oblanceolate, acuminate, the largest 7.5–13.5 cm. long and 1.5–3.5 cm. broad, the uppermost 2 or 3 smaller, lanceolate.. Inflorescence 10–25 cm. long, 3–4.5 cm. in diameter, rather laxly many-flowered.. Bracts lanceolate, acuminate, 1–2 cm. long, shorter than the flowers.. Flowers spreading, often nearly horizontally, green or yellowish-green, fragrant; pedicel with ovary curved, 15–20 mm. long.. Dorsal sepal erect, elliptical-ovate, rounded at apex, convex, 4.5–6 mm. long, 3–4 mm. broad; laterals deflexed, obliquely curved-lanceolate, subacute, 6–8 mm. long, 2.7–3.5 mm. broad.. Petals bipartite nearly to the base; posterior (upper) lobe erect, ± adherent to the dorsal sepal, linear, curved, 4.5–5.5 mm. long, i 1 mm. broad; anterior lobe much narrower, curved upwards, 7.5–9.5 mm. long.. Lip decurved, tripartite from an undivided base 1.5-2 mm. long; middle lobe broadly linear, 5.5–8 mm. long and 1 mm. broad; side lobes linear, 7–10 mm. long, half as broad as the middle lobe.. Spur ± parallel to ovary, only slightly swollen in the apical half, 17–22 mm. long.. Anther ± 2 mm. high, rounded at apex, loculi parallel, ± reclinate, canals porrect, very short, ± 0.5 mm. long.. Stigmas ± adpressed to base of lip, thinly club-shaped, 1.5–2.5 mm. long.. Rostellum triangular, short and broad.
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Leaves 9–13, the lowermost 2–4 sheath-like, the largest leaves in the middle, 7.5–12.5 × 1–3.5 cm, oblanceolate (rarely almost linear), narrowing at the base, suberect or spreading, light green.
Lip 3-lobed almost to base; mid-lobe 5.5–9 × 1 mm, linear; side lobes 7–12 mmlong, c. 0.5 mm wide, curving up like lower petal lobes; spur 17–22 mm long, slender, parallel to ovary.
Terrestrial herb 25–55 cm high with globose tubers c. 15 mm in diameter, sometimes with additional tubers produced at the end of c. 13 cm long rhizomes.
Petals 2-lobed ± to base; posterior (upper) lobe 4–5.5 × c. 1 mm, ± adnate to dorsal sepal; anterior (lower) lobe 5–9.5 × c. 0.5 mm, curving upwards.
Dorsal sepal 4–5.5 × 2.5–4 mm, ovate, erect, convex; lateral sepals 5–7 × 2–3.5 mm, obliquely curved-lanceolate, deflexed.
Inflorescence 5–21 × 2.5–4.5 cm, rather laxly many-flowered; bracts 9–15 mm long, lanceolate, acuminate.
Stem leafy thoughout, the lowermost foliage leaf c. 8 cm from base.
Flowers yellow-green, spreading, sometimes described as fragrant.
Stigmas 1.5–2.5 mm long, clavate, ± appressed to base of lip.
Anther c. 2 mm high; canals very short, c. 0.5 mm long.
Ovary and pedicel arched, 12–18 mm long.
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