Erect, epiphytic herbs with short, fleshy, approximate, ovoid to suborbicular, somewhat compressed, diphyllous pseudobulbs up to about 4 cm. long and 3 cm. wide, the bases usually with 2 foliaceous bracts. Leaves and bract blades narrowly lanceolate, obtuse to subacute, subcoriaceous, 9-20 cm. long and 2-2.5 cm. wide, contracted below into short, conduplicate petioles. Inflorescences 1 or 2 slender, erect or arching, few-flowered racemes up to about 36 cm. long, produced from the lateral bases of the pseudobulbs. Flowers relatively large, up to about 5 cm. long and 3 cm. wide. Sepals free, subequal, usually reflexed, pale yellow to greenish yellow, shaded or spotted with red or purple, lanceolate, acute, the lateral sepals somewhat oblique, 1.2-1.5 cm. long and 3-5.5 mm. wide. Petals spreading, sub-equal to the sepals or a little broader, ligular to elliptic-lanceolate, obtuse to sub-acute, yellow or greenish yellow, shaded or spotted with red or purple, 1.2-1.5 cm. long and 0.4-0.7 cm. wide. Lip pandurate, 3-lobed, 2-2.5 cm. long and 2-2.5 cm. wide, bright yellow, the lateral lobes small, obliquely triangular or subquad-rate, obtuse, the anterior margins contracted into a narrow isthmus, the mid-lobe abruptly and broadly dilated and 2-lobed, transversely reniform, the disk with a short, fleshy, 5-toothed callus. Column about 5 mm. long, with prominent lateral wings.
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