Erect, robust epiphytic herbs with approximate, oblong-ovoid, compressed, strongly ridged, diphyllous pseudobulbs 6-16 cm. long and 2-6 cm. wide, enveloped below in the conduplicate, distichously imbricating bases of 3-4 elongate, foliaceous bracts. Leaves and bract blades linear-lanceolate, acute, subcoriaceous, 12-75 cm. long and 1.5-4 cm. wide, contracted below into elongate, conduplicate petioles. Inflorescences 1 or 2 erect, arching, pendulous or sometimes scandent, many-flowered panicles 1-3.5 m. in length, produced from the lateral bases of the pseudobulbs. Flowers of moderate size averaging about 2.5 cm. in diameter. Sepals free, subequal, spreading, shortly clawed at the base, yellow heavily barred and blotched olive-brown, elliptic-obovate, acute, with somewhat undulate margins, 10-13 mm. long and 4-5 mm. wide. Petals subequal to the sepals and similarly colored, spreading, often with recurved apices, elliptic-obovate to elliptic-lanceolate, acute, with somewhat undulate margins, 10-12 mm. long and 4-5 mm. wide. Lip obscurely 3-lobed, broadly pandurate, yellow with a large, transverse, reddish brown to yellowish brown blotch below the crest, the lip 10-15 mm. long and 10-15 mm. wide, the lateral lobes rounded or broadly and obtusely triangular, the central lip with a sharp constriction but without a distinct isthmus, the mid-lobe emarginate, obscurely 2-lobed, transversely oblong or subreniform, the basal and apical halves of the lip of about equal width, the disk with an erect, white, fleshy crest surmounted by 4 divergent, usually crenulate keels, terminating at the apex in 3 distinct fleshy teeth. Column short, 3-5 mm. long, with 2 prominent, spreading, usually serrate, lateral wings.
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