Erect, tufted, epiphytic herbs without pseudobulbs. Leaves plicate, subcoriaceous, linear-lanceolate to elliptic-lanceolate, acute, 15-30 cm. long and 3-4.5 cm. wide. Inflorescences of erect 1-flowered scapes 10-15 cm. tall produced from the axils of the central leaves. Flowers large and conspicuous. Sepals subequal, fleshy, spreading, elliptic-lanceolate, acute to acuminate, the margins undulate, the apical 2/3 a waxy reddish brown, usually with some yellow spots, the basal 1/3 white or pale yellow, the dorsal sepal free, 4-6 cm. long and 2-2.5 cm. wide, the laterals connate at the base and obliquely inserted on the column foot, 4.5-6 cm. long and 1.5-2.5 cm. wide. Petals fleshy, spreading, subequal and colored similarly to the sepals, with purple blotches or streaks at the base near the insertion on the column foot, broadly elliptic-lanceolate, acuminate, with undulate margins, 3.5-5.6 cm. long and 2-3 cm. wide. Lip fleshy, the base nearly white or yellowish, the frontal half of the apical lobe usually a rich waxy reddish brown or brownish purple, 2.5-3.5 cm. long and 2-3 cm. wide, the base of the lip abruptly contracted, with a conspicuous claw which forms a geniculate angle with the foot of the column, the basal callus with an erect semicircular fimbriate crest, the posterior margins of which are incumbent on the foot of the column, the apical lobe obscurely 3-lobulate, obovate, acute to acuminate, contracted at the base and articulated with the apex of the callus plate, the lateral lobules rounded, spreading, the apical lobule broadly triangular, the acuminate apex recurved. Column stout, erect, 1.5-2 cm. long, semiterete below, dilated above, with a conspicuous dorsal keel and broad lateral wings which are confluent at the apex, forming a hood over the clinandrium. Anther terminal, operculate, incumbent, imperfectly 2-celled.
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