A terrestrial herb 25–45(–70) cm. high, entirely glabrous.. Roots smooth, fleshy, white, 3–5 mm. broad.. Pseudobulbs cylindrical, 5–7.5 cm. long, 1.5–2 cm. broad, 1-leaved, enclosed when young by a few scarious, straw-coloured, ovate to lanceolate, acuminate, evanescent sheaths.. Leaves linear-lanceolate to broadly lanceolate, acute or acuminate, conduplicate and cuneate towards base; lamina (7–)30–45 cm. long, 2–5(–6.5) cm. broad, green; petiole irregularly articulated, 5.5–10(–20) cm. long.. Inflorescence erect, paniculate, elongated, 8–35(–40) cm. long, 4–6 cm. broad, many-flowered, lax or subdense; lowermost bracts narrowly elliptic, uppermost linear-subulate, acute, 1–15(–20) mm. long.. Flowers with green sepals and petals; lip white or cream with purplish-red veins on the side lobes and 2 purple blotches at base of mid-lobe; pedicel and ovary slender, 1–1.8 cm. long.. Dorsal sepal oblong-elliptic, mucronate, 3-nerved, 8–10.5 mm. long, 3–4.5 mm. broad, erect; lateral sepals oblique-or falcate-oblanceolate, mucronate, 4-nerved, 8–10.2 mm. long, 3–5 mm. broad, spreading.. Petals oblong-elliptic, acute or mucronate, 3-nerved, 7.5–9.5 mm. long, 3–4.7 mm. broad.. Lip not articulated at the base, distinctly 3-lobed, glabrous, 8–10.5 mm. long, 8–12.5 mm. broad; mid-lobe divided into 2 distinct, obliquely obovate or subquadrate, divaricate lobules, each 4–6 mm. long, with a mucro in the sinus between; side lobes oblong, rounded, not saccate at base, erect, shorter than mid-lobe; disc with 2 somewhat flattened, parallel basal keels and 2 distal slightly raised, papillose nerves.. Spur cylindrical, straight, obtuse, descending, 3–4 mm. long.. Column porrect, oblong, 2.5 mm. long; foot short, 1–2 mm. long; anther quadrate, emarginate, glabrous, 1.5 mm. long.. Pl. 1.
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