Erect, epiphytic herbs with linear to oblong-elliptic, laterally compressed, diphyllous, stipitate pseudobulbs 5-14 cm. long and 2-6 cm. wide, the more robust plants having one side of the pseudobulb flattened, while the other surface is conspicuously convex, the complanate-cylindric lower portions and bases of the pseudobulbs invested with several closely imbricating bracts, the uppermost 2-3 of which are distichously arranged and conspicuously foliaceous. Leaves lanceolate to ligular, acute, subcoriaceous, 10-28 cm. long and 1.5-5 cm. wide. Inflorescences 1-2 simple, erect, few-flowered racemes 9-25 cm. long. Flowers of moderate size, the sepals greenish with broad transverse bands of brown or brownish lavender, the petals pale lavender to greenish brown, the lip white, with conspicuous purple or lavender markings in the center, the disk yellow, the column and anther tinged with lavender. Sepals of about equal length, elliptic-obovate, shortly acute, the apex concave with a short fleshy apiculate keel or thickening on the dorsal surface, 1.3-2 cm. long and 0.7-1.0 cm. wide, the base adnate to the base of the column slightly above the insertion of the petals, the lateral sepals strongly reflexed, narrowly and somewhat obliquely oblanceolate, acute, 1.5-2.2 cm. long and 0.6-0.8 cm. wide, the dorsal surfaces thickened into short apiculate keels at the apices. Petals subequal to the dorsal sepal, elliptic-obovate, concave, 1.5-1.8 cm. long and 0.6-0.9 cm. wide, the apices thickened into short, acute keels on the dorsal surfaces. Lip clawed at the base, the claw adnate to the lower half of the column, the free limb abruptly deflexed, obscurely 3-lobed, subquadrate, 1.2-1.6 cm. long and 1.4-1.8 cm. wide, the basal and apical halves of about equal width, the lateral margins at the base spreading, the mid-lobe emarginate and 2-lobed, with a thickened central keel, usually more or less porrect, the disk with 2 narrow parallel keels about equaling the lateral lobes-of the lip in length. Column semiterete, slightly arcuate, about 1.5 cm. long, with a narrowly elliptic concavity below the stigma.
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