Stem woody, up to 20 cm. in height, 10 mm. in diameter, bearing 8–15 leaves distributed over its entire length and 6 mm. apart.. Roots numerous, greyish coloured, 3–4 mm. in diameter.. Leaves distichous, often falcate, ligulate, linear-lanceolate or oblanceolate, up to 15 cm. long, 1–2.3 cm. wide, gradually narrowed to the sheathing base, dark green, black-dotted on both surfaces, the apex unequally bilobed, the lobes obtuse or subacute, the longer one up to 10 mm. long, the shorter often absent, margins entire.. Inflorescences arising opposite to a leaf, from the same place in several successive years, horizontal or arching racemes bearing 4–8 flowers, up to 17 cm. long; peduncle terete, up to 4 cm. long, 2 mm. in diameter, pale greenish brown, black-dotted; rhachis ± straight; bracts broadly ovate, 5–6 mm. long, black at flowering time.. Flowers white with a greenish or orange-pink suffusion, 8–18 mm. apart, opening at the base of the inflorescence first; pedicel with ovary greenish or brownish, 3 cm. long.. Dorsal sepal erect, narrowly elliptic, acute, 10–12 mm. long, 5 mm. wide; lateral sepals reflexed, narrowly elliptic, 12–15 mm. long, 4 mm. wide.. Petals reflexed, narrowly elliptic, acute, 11–13 mm. long, 4 mm. wide.. Lip narrowly obovate, the lateral margins reflexed, apiculate, 13–15 mm. long, 5 mm. wide.. Spur deflexed or curving forwards slightly, somewhat thickened in the lower half but tapering towards the tip which is sometimes minutely bicuspidate, 4–5.5 cm. long.. Column 4 mm. high, terete below, widened above; anther-cap beaked; rostellum curving downwards, across the face of the stigma; pollinia globose; stipes slender; viscidium obovate; stigmatic cavity rhomboid.. Pl. 6. Fig. 136.
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