A terrestrial herb (40–)50–80 cm. high, glabrous except for the callus on the lip.. Roots numerous, smooth, fleshy, white, 3–4 mm. broad.. Pseudobulbs caespitose, narrowly ovoid to fusiform, very slightly compressed, obscurely sulcate, erect or spreading, (4–)8–15 cm. long, the widest part up to 2.5 cm. broad, dark, slightly glossy green, 2-or occasionally 1-leaved, the base enclosed when young by 2 or 3 scarious, straw-coloured evanescent sheaths.. Leaves narrowly elliptic or ovate-elliptic, sometimes oblique, acute or acuminate, margin gently undulate, obscurely nerved; lamina spreading, (10–)13–18(–26) cm. long, (3–)4.5–6(–8) cm. broad, slightly glossy dark green; petiole irregularly articulated, shorter than the lamina, 6–17 cm. long.. Inflorescence erect, simple or with 1 or 2 short branches at the base, 16–22(–30) cm. long, 4–5 cm. broad, dense or lax, 15–28-flowered; bracts ovate-deltoid to narrowly ovate-elliptic, acute, 2–8 mm. long, with a basal extrafloral nectary exuding copious viscid sweet liquid.. Flowers porrect at first, becoming somewhat deflexed with age; sepals and petals pale greenish yellow with 3–5 vinous nerves; lip pale yellow or greenish cream with vinous nerves on the lobes, green towards the spur-entrance; calli creamy white.. Spur reddish brown; column green, anther yellow; pedicel and ovary slender, 12–18 mm. long, reddish brown.. Dorsal sepal narrowly oblong or oblong-obovate, obtuse or mucronate, 3-nerved, erect or somewhat reflexed, 8.5–10.5(–14) mm. long, 3–5 mm. broad; lateral sepals narrowly oblong or oblong-obovate, obtuse or mucronate, 4-nerved, slightly concave distally, spreading, (9.7–)10.5–14 mm. long, 3–5 mm. broad.. Petals ovate, obtuse, 5-nerved, curving forwards, (8–)9–13 mm. long, (4.5–)5–7 mm. broad.. Lip bent forwards from and articulated at the base, distinctly 3-lobed, mostly glabrous, (10–)12–15 mm. long; mid-lobe divided into 2 lobules, each oblong to oblong-orbicular, usually divaricate, longer than side lobes, 8–12 mm. long, (7–)11–12(–14) mm. broad; side lobes ± orbicular, not saccate at the base, erect to spreading; disc proximally callose, papillose, sometimes with 3 or 4 low, longitudinal ridges distally; callus composed of 2 ± parallel fleshy, glabrous keels, shortly pubescent at the spur-entrance and at the apex.. Spur cylindrical, obtuse, descending, 4–6 mm. long.. Column erect, oblong or ovoid, with a very short pubescent foot, 2.5–5 mm. long, foot 1 mm. long; anther ovate-oblong, papillose, ± 2 mm. long.. Pl. 1. Fig. 90.
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Lip 10–15 mm long, 3-lobed, the mid-lobe 8–12 × 7–14 mm, deeply divided into 2 oblong or oblong-orbicular lobules; side lobes ± orbicular, erect or spreading; disk papillose, callus with 2 fleshy keels, shortly pubescent at the mouth of the spur and at the apex; spur 4–6 mm long, cylindrical, obtuse.
Leaves 2 (rarely 1), petiolate; petiole 6–17 cm long, irregularly articulated; lamina 10–26 × 3–8 cm, longer than the petiole, narrowly elliptic or ovate-elliptic, acute or acuminate, undulate on the margins, dark glossy green.
Sepals and petals greenish-yellow with 3–5 purple veins; lip pale yellow or greenish-cream with purple veins on the side lobes; calli cream; spur red-brown; column green with a yellow anther.
Sepals 8.5–14 × 3–5 mm, narrowly oblong or obovate-oblong, obtuse, the lateral sepals usually slightly longer than the dorsal sepal.
Pseudobulbs 4–15 cm long and up to 2.5 cm wide, narrowly ovoid to fusiform, very slightly compressed, forming clumps.
Inflorescence erect, 16–30 cm long, simple or with 1–2 short branches, several-to many-flowered.
Bracts 2–8 mm long, narrowly ovate-elliptic, with a basal extra-floral nectary.
Petals 8–13 × 4.5–7 mm, ovate, obtuse, curving forwards.
Pedicel and ovary 12–18 mm long, slender, red-brown.
Column 4 mm long, 2 mm broad, with a short foot.
Roots fleshy, 3–4 mm in diameter.
Terrestrial herb 40–80 cm high.
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