Plants 30-70 cm tall. Rhizome inconspicuous. Pseudobulbs nearly narrowly ovoid or cylindric, very small, 1-2.5 cm × 5-15 mm, with 2 sheaths. Leaves 3 or 4, well developed and spreading at anthesis, not deciduous; blade elliptic or elliptic-lanceolate, 15-30 × ca. 9 cm, abaxially puberulent, 3-or 4-veined, apex acute or acuminate; petiole-like base 10-20 cm, slender. Scape arising from leaf axil, erect, to 70 cm, puberulent; rachis 8-15 cm, laxly ca. 10-flowered; floral bracts persistent, lanceolate, ca. 10 mm, abaxially puberulent. Flowers yellowish green; pedicel and ovary ca. 30 mm, puberulent. Dorsal sepal reflexed, obovate-lanceolate, ca. 15 × 7 mm, abaxially puberulent, 5-veined, apex obtuse and mucronate; lateral sepals reflexed, elliptic, oblique, ca. 15 × 6 mm, abaxially puberulent, 5-veined, base clawed, apex acute. Petals reflexed, subspatulate, ca. 12 × 2-2.5 mm, glabrous, apex obtuse; lip adnate to entire length of column wings, deeply 3-lobed; lateral lobes ovate, 6-7 × ca. 5 mm, apex obliquely truncate; mid-lobe divided by a deep sinus into 2 lobules, apiculate in sinus; lobules divergent, ca. as large as lateral lobes; disk with a cluster of yellow wartlike calli at base; spur slightly arcuate, yellowish green, 20-30 mm, slender, outside puberulent, apex obtuse. Column white, ca. 7 mm, dilated at apex, subglabrous; rostellum 2-lobed; anther cap white; pollinia clavate, subequal in size, ca. 2 mm; viscidium subsquare, ca. 1 mm. Fl. Jun-Aug. 2n = 40, 40 + 2B, 42.
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