Erect, epiphytic herbs with approximate, rather fleshy, oblong-ovoid, elliptic or suborbicular, laterally compressed, monophyllous pseudobulbs 3.5-8 cm. long and 2.5-6 cm. wide, the bases enveloped in several thin, papery, imbricating bracts which soon weather away. Leaves elliptic-lanceolate, acute, subcoriaceous, 10-40 cm. long and 3.5-8 cm. wide, contracted below into short or elongate, condupli-cate petioles. Inflorescences short, arching or pendulous, 2-to 5-flowered scapes produced from the bases of the pseudobulbs. Flowers large and attractive, fragrant, the sepals and petals white or creamy white sometimes spotted with pale rose-pink or red, the lip white or creamy white usually heavily spotted rose-pink, the inner tube most frequently with yellow or orange markings, very rarely blotched red. Sepals subequal, free, widely spreading, usually with undulate margins, lanceolate, acute, with a central thickened nerve or keel on the dorsal surface, 3-5.5 cm. long and 0.6-1.0 cm. wide, the lateral sepals rarely somewhat connate at the very base. Petals subequal to the sepals, lanceolate, shortly acute, with undulate margins, 2.8-5 cm. long and 0.8-1.2 cm. wide. Lip tubular, 3-lobed, obovate when spread out, 4.5-6.5 cm. long and 3-5 cm. wide, the narrow base adnate to the base of the column, the rounded lateral lobes convolute forming a tube, the anterior margins usually crisped and undulate, the mid-lobe retuse or emarginate, the lobules undulate, crisped and reflexed, the disk with a prominent, erect, central keel exceeding the column in length. Column elongate, terete, the margins of the apex projecting, forming a conspicuous, fimbriate, obscurely 4-lobed hood over the anther.
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