A very variable, erect, epiphytic or rarely lithophytic plant, 10–50 cm. long.. Stems clustered, terete, to 30 cm. long, 4–7 cm. wide, clothed below by up to 3 tubular sheaths, 2–5-leaved above.. Leaves linear-ligulate to linear-lanceolate, suberect, acute or subacute, 10–23 cm. long, 0.7–2 cm. wide, articulated to a tubular sheathing base.. Inflorescence often shorter than the leaves, racemose or shortly branched, 5–20 cm. long; peduncle terete, covered with papery sheaths, 2–70 cm. long; rhachis terete, short, glabrous; branches short, suberect, 1–5 cm. long; bracts more or less imbricate, ovate, acute or acuminate, 2–4(–8) cm. long.. Flowers glabrous on outer surface, white, tinged yellow and purple, to greenish yellow.. Dorsal sepal lanceolate, acute, 6.6–8.4 mm. long, 2.8–3.7 mm. wide; lateral sepals very obliquely triangular-ovate, acute, 7.6–11 mm. long, 5.7–8 mm. wide, mentum conical, 5.5–9.5 mm. high.. Petals oblanceolate, subacute or obtuse, 5.5–6.7 mm. long, 1.5–1.8 mm. wide.. Lip clawed, 3-lobed above the middle, 6–9 mm. long, 5–7.3 mm. wide, ± pubescent on claw and in apical half; side lobes erect, rounded sinus between mid-lobe and side lobes obvious; mid-lobe triangular-ovate, acute, reflexed; disc with a fleshy central ridge dilated towards the apex.. Column short, terete, truncate, 1 mm. long.
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Plants epiphytic, 150-400 mm tall; stems slender, not swollen into pseudobulbs; leaves 2-4, thin, erect, linear-lorate, acute, sometimes minutely unequally bilobed, 120-220 x 8-16 mm. Inflorescences shorter than the leaves, paniculate, branches 20-30 mm long, densely many-flowered; bracts narrowly ovate, acuminate, 3-4 mm long. Flowers white, tinged yellow and purple, to greenish-yellow. Sepals unequal, apiculate; median sepal narrowly triangular, 7.5-9 x 3-3.5 mm; laterals obliquely broadly ovate, 8.5-10 x 5-8 mm. Petals lorate-spathulate, acute, 6-7 x 1.5-2.2 mm. Lip obovate, 3-lobed with the sinuses between the lobes obscure, pubescent on top, 8 x 6-8 mm, disc with a central knob-like callus; midlobe ovate, acute, reflexed, 3 mm long; side lobes porrect, rounded, to 2.5 mm tall; mentum conical, 6-7 mm tall. Gynostemium 2 mm tall. Capsules very narrowly ovoid, 25-30 x 7 mm.
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