Robust, epiphytic or semi-terrestrial herbs with stout, fusiform pseudobulbs 12-40 cm. long and 2-6 cm. wide, the old pseudobulbs naked or enclosed in the imbricating, persistent leaf bases which are armed at the apex with stout, sharp spines. Leaves linear-lanceolate, acute or acuminate, plicate, distichous, strongly veined, 30-120 cm. long and 2-7.5 cm. wide. Inflorescence a lateral leafless panicle from the base of the pseudobulb, 60-120 cm. tall, the bracts oblong-lanceolate, with undulate margins, resembling the sepals in color and markings. Flowers many. Sepals free, subequal, spreading, oblong-lanceolate, acute or apiculate with strongly undulate margins, greenish yellow spotted irregularly with reddish brown. Dorsal sepal 0.8-2.5 cm. long and 0.8-1.1 cm. wide, lateral sepals 1.5-2 cm. long and 0.7-1.0 cm. wide. Petals free, spreading, obovate, obtuse or apiculate, yellow irregularly spotted red-brown, 1.5-2.0 cm. long and 0.9-1.2 cm. wide. Lip 3-lobed, the lateral lobes erect, more or less convergent over the column, rounded, usually exceeding the mid-lobe in size, reddish-brown shading to yellow at the base, mid-lobe strongly undulant, crisped, yellow, marked purple or reddish brown, crest tuberculate, verrucose, base of lip an oblong limb articulated with the column foot. Column short, arcuate, with a dorsal crest, dilated or semi-auriculate above, narrowed below, produced at the base into a foot.
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Plants epiphytic, 50–150 cm. Pseudobulbs elongate, fusiform, to 50 cm. Inflorescences erect, paniculate, to 90 cm. Flowers bright yellow with maroon and green markings, 4–5 cm wide; lip with middle lobe margins conspicuously verruculose-tuberculate, lateral lobes spotted or solid dark orange or maroon, longer than middle lobe. Capsules to 10 cm. 2n = 46.
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