Stem woody, up to 10 cm. long, 5 mm. in diameter, with numerous flexuous roots 2–4 mm. in diameter.. Leaves 4–7, distichous, oblanceolate, 6–17 cm. long, 1.5–5.5 cm. wide, somewhat oblique or falcate, apex unequally bilobed, the longer lobe obtuse or subacute and up to 20 mm. long, the shorter rounded, 2 mm. long or absent, fleshy, dark green in colour dotted with black or dark brown especially towards the base.. Inflorescences arising below the leaves or axillary, erect, horizontal or pendent racemes bearing 4–16 flowers; peduncle terete, 4–8 cm. long, bearing 2–3 tight sheaths, black-dotted; rhachis ± zigzag, greyish green heavily dotted with brown, 1–3 mm. in diameter; bracts spreading, triangular, subacute or obtuse, 3–5 mm. long.. Flowers held erect or curving forwards, 0.6–3 cm. apart, opening green, becoming white after a few days with the tips of the perianth-parts usually tinted with rose or brown, the spur pale greenish brown; pedicel with ovary slender, 2–3.5 cm. long.. Dorsal sepal erect or only slightly reflexed, lanceolate, acute or acuminate, 13–15 mm. long, 3.5–5 mm. wide; lateral sepals obliquely curved and reflexed, narrowly lanceolate, acuminate, slightly winged on the back, 13.5–17 mm. long, 2.5–4 mm. wide.. Petals reflexed, lanceolate, acuminate or cuspidate, 9–15 mm. long, 2.5–4 mm. wide.. Lip deflexed, lanceolate but with the lateral margins strongly recurved, 10–14.5 mm. long, 3.5–6 mm. wide.. Spur pendent, straight or slightly incurved, gradually narrowed towards the apex, 6–7.5 cm. long, 2 mm. in diameter near the mouth.. Column erect, terete below with a short pointed tooth projecting into the mouth of the spur, inflated above, 6–8 mm. long; anther-cap hemispherical, with a short central beak; rostellum straight or porrect; pollinia oblong; stipes slender; viscidium cordate; stigmatic cavity oblong.
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Dorsal sepal erect or slightly reflexed, 13–15 × 3.5–5 mm, lanceolate, acute or acuminate; lateral sepals reflexed, 13.5–17 × 2.5–4 mm, narrowly lanceolate, acuminate, slightly winged on the back.
Leaves 4–7, distichous, 6–17 × 1.5–5.5 cm, obliquely oblanceolate, unequally 2-lobed at apex with the lobes rounded or subacute; lamina fleshy, dark green dotted with black.
Lip deflexed, 10–14.5 × 3.5–6 mm, lanceolate but with lateral margins strongly recurved; spur pendent, 6–7.5 cm long, straight or incurved, gradually tapering.
Column 6–8 mm long, with a short, pointed tooth projecting into the mouth of the spur; anther cap hemispherical wth a short, central beak.
Inflorescences erect, spreading or pendent, 4–16-flowered. Peduncle 4–8 cm long with 2–3 tight sheaths; rhachis zigzag.
Flowers white, usually tinged with pink at the tips of the tepals; spur pale greenish-brown.
Petals reflexed, 9–15 × 2.5–4 mm, lanceolate, acuminate or cuspidate, 9–15 × 2.5–4 mm.
Epiphytic herb; stem woody, to 10 cm long; roots numerous, 2–4 mm in diameter.
Bracts 3–5 mm long, spreading, triangular.
Pedicel and ovary 2–3.5 cm long.
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