Erect, robust, epiphytic herbs with approximate, oblong-ovoid, strongly ridged pseudobulbs up to about 18 cm. tall and 4 cm. wide, the apices with 1 or 2 leaves, the lower portions enveloped in the coarsely fibrous, conduplicate, imbricating bases of several conspicuously foliaceous bracts. Leaves and bract blades linear-ligular, acute, subcoriaceous, up to about 75 cm. long and 2.5-4 cm. wide. Inflorescences 1 or 2 stout, erect, arching or pendulous, many-flowered panicles up to about 3 m. in length, produced from the lateral bases of the pseudobulbs. Flowers of moderate size, 2.5-3 cm. in diameter. Sepals free, subequal, spreading or reflexed, shortly clawed at the base, yellow marked with brown, the dorsal sepal elliptic-lanceolate, acute, 1-1.5 cm. long and 0.4-0.5 cm. wide, the lateral sepals obliquely linear-lanceolate, acute or shortly acuminate, the dorsal surface with a distinct central keel, 1.2-1.7 cm. long and 0.35-0.45 cm. wide. Petals subequal to the dorsal sepal and similarly colored, elliptic-lanceolate, acute, with undulate margins, 1-1.4 cm. long and about 0.5 cm. wide. Lip pandurate, 3-lobed, yellow with a reddish brown central blotch, 1.2-1.5 cm. long and 0.9-1.2 cm. wide, the lateral lobes small, suborbicular to subquadrate, obtuse, the central portion of the lip contracted into a distinct isthmus, the mid-lobe abruptly dilated, emarginate and bilobed, transversely reniform in outline, the disk with an erect, fleshy callus, at the base with 2 lateral crenulate or denticulate wings or plates, the apex with 3 short, fleshy teeth. Column about 5 mm. long, with the lateral wings often bifid, the lower lobules obtuse and spreading, the apices acute or acuminate, often more or less converging.
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