Oeceoclades decaryana (h.Perrier ex Guillaumin, Manguin) Garay & P.Taylor

A terrestrial herb 50–60(–80) cm. high, entirely glabrous.. Pseudobulbs ovoid, 5-angled, 4 cm. long, 2.3 cm. broad, (1–)2(–3)-leaved.. Leaves linear-ligulate to lanceolate, acute, abbreviated towards the base, sessile, rigid, median nerve prominent on lower surface, (12–)15–23 cm. long, 1–1.2(–1.9) cm. broad, spreading, persisting for 2 or 3 seasons, greyish green, mottled bluish grey and whitish grey, sometimes suffused brown.. Inflorescence simple, erect, 22–35(–60) cm. long, 3.5 cm. broad, laxly 12–20-flowered; bracts linear to linear-lanceolate, acute, 3-nerved, shorter than ovary, 6–15 mm. long.. Flowers porrect; sepals and petals olive-green, with red or brownish purple nerves and markings; lip either bright yellow with red nerves or with the proximal lobes green with purple nerves and the distal lobes cream or pale green with purple nerves and a central yellow patch, calli lilac, spur green or orange; column yellowish green; pedicel and ovary slender, 12–25 mm. long.. Dorsal sepal erect, oblanceolate to spathulate, apiculate, 3-nerved, 12–20 mm. long, 3–4 mm. broad; lateral sepals spathulate, apiculate, often somewhat falcate, deflexed, 14–20 mm. long, 2.7–4 mm. broad.. Petals oblong-elliptic or obliquely ovate-elliptic, apiculate, 3-nerved, 7–10 mm. long, 4–7 mm. broad.. Lip projecting forwards, articulated at the base, distinctly 3-lobed, rarely obscurely 4-lobed, 12–16 mm. long, 13–18 mm. broad; mid-lobe divided into 2 lobules, each broadly oblong or ± orbicular, somewhat deflexed, divaricate, margins sometimes gently undulate, nerves many, inconspicuous, vinous, longer than the side lobes; side lobes subquadrate or rounded, somewhat saccate at the base, erect, nerves 3–5, prominent, vinous; callus at the base of the lip, formed of 2 raised, horizontal, oblong, glabrous lobes which gradually extend towards the apical sinus as 2 minutely papillose, low, parallel keels, between which may be a third median keel.. Spur stout, cylindrical, often slightly dilated at the middle, weakly carinate, decurved, 4–6 mm. long.. Column erect, ovoid-oblong, 4–5 mm. long, 3 mm. broad, with a short foot ± 2 mm. long; anther ± ovate, emarginate at apex, 2 mm. long and broad.