A terrestrial herb 3–5.5 dm. high, glabrous except for the roots.. Tubers almost globose to elongate-ovoid, 2–2.5 cm. long, 0.5–2 cm. in diameter.. Stem erect, rather slender to rather stout, with a pair of leaves at the base and a number of sheaths almost covering the whole length.. Leaves ovate-lanceolate, ovate, oblong or orbicular, apiculate, sometimes slightly cordate at the base, 2.5–6 cm. long, 2–5 cm. broad; sheaths 5–8, ± adpressed, lanceolate, acute, 2–4.5 cm. long.. Inflorescence 6–15 cm. long, ± 2.5–3 cm. in diameter, loosely or rather densely 5–12-flowered.. Bracts similar to the sheaths, 1.5–3.5 cm. long, the lower ones often as long as the pedicel with ovary.. Flowers suberect, white and green; pedicel with ovary slightly curved, 2–3 cm. long.. Dorsal sepal erect, ovate, acute, convex, 6–8 mm. long, 5–6 mm. broad; laterals deflexed, obliquely semi-ovate, acute, 7–11 mm. long, 3.5–4.5 mm. broad.. Petals bipartite nearly to the base; posterior (upper) lobe erect, hidden under the dorsal sepal, curved, lanceolate-ovate, acute, 5.5–7.5 mm. long, 3–4 mm. broad; anterior lobe spreading, cuneate-oblanceolate, obtuse, 6–5–10 mm. long, 2–3 mm. broad.. Lip spreading downwards, tripartite from an undivided base 1–2 mm. long; middle lobe elliptical-oblanceolate, subacute, 7–10 mm. long, 2.5–4 mm. broad; side lobes slightly incurved, similar to the anterior petal-lobe, 5.5–9.5 mm. long, 1.5–4.5 mm. broad.. Spur dependent, swollen in the apical half, 1–4.5 cm. long.. Anther erect, apiculate, 4–5.5 mm. high, canals very short, scarcely 0.5 mm. long.. Stigmas porrect, rather stout, club-shaped, 2–3 mm. long.. Rostellum triangular-linear, acute, ± 1.75 mm. long.
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Lip 3-lobed to 1–2 mm from base, all lobes oblanceolate, obtuse; mid-lobe 7–13 × 2.5–3 mm; side lobes 5.5–12 × 2.5–4 mm, slightly incurved; spur 3–11.5 cm long, slender but swollen at apex, often caught inside bracts.
Petals 2-lobed almost to base; posterior lobe 5.5–9.5 × 3–4 mm, curved lanceolate, acute, lying inside dorsal sepal; anterior lobe deflexed, 6.5–12 × 2.5–3.5 mm, oblanceolate, obtuse.
Basal leaves appressed to the ground, 4–8 × 2.5–6 cm, broadly ovate to orbicular, apiculate, sometimes cordate at base; stem leaves up to 5.5 cm long.
Dorsal sepal erect, 6–9 × 3.5–5 mm, ovate, convex; lateral sepals deflexed, 8–11 × 3.5–6 mm, obliquely semi-ovate, acute.
Stem erect, with 2 basal leaves and c. 6 sheath-like stem leaves along its length.
Sepals greenish-white, papillose or pubescent on outside, petals and lip white.
Inflorescence 9–18 cm long, rather laxly 5–13-flowered; bracts 12–25 mm long.
Terrestrial herb 45–80 cm tall; tubers up to 2.5 cm long, ± globose to ovoid.
Anther 4–5.5 mm high, erect, apiculate; canals very short, c. 0.5 mm long.
Stigmas 2–3 mm long, club-shaped.
Ovary and pedicel 20–30 mm long.
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