Erect, caespitose, epiphytic herbs with approximate, elliptic-ovoid, compressed, usually diphyllous pseudobulbs 4-8 cm. tall and 2-3 cm. wide, the bases enveloped in several conduplicate, imbricating bracts, the uppermost bract being conspicuously foliaceous. Leaves ligular, obtuse to subacute, subcoriaceous, 15-30 cm. long and 1.5-3.5 cm. wide, contracted below into slender, conduplicate petioles. Inflorescence a solitary, erect or arching, 4-to 12-flowered, unilateral raceme exceeding the leaves, up to about 5 dm. long, produced from the axil of the uppermost foliaceous bract. Flowers of moderate size, about 3 cm. in diameter, uniformly yellow throughout, the elongate pedicels subtended by conspicuous, papery, spathaceous bracts. Sepals dissimilar, the dorsal sepal free, oblong, obtuse, with slightly undulate margins, 10-12 mm. long and 5-6 mm. wide, the lateral sepals connate nearly to the apex, forming a single obovate, bifid segment below the lip, the lower surface with 2 distinct keels, 1.4-1.6 cm. long and 0.7-0.9 cm. wide. Petals obliquely oblong, obtuse, with slightly undulate margins, 1.2-1.4 cm. long and 0.7-0.8 cm. wide. Lip subpandurate, obscurely 3-lobed, 1.5-1.8 cm. long and 1.5-1.8 cm. wide at the apex, the lateral lobes reduced to inconspicuous auricles, the basal half of the lip nearly oblong, the apical half abruptly dilated and 2-lobed, reniform, about twice as wide as the basal half, the disk with a narrow, fleshy crest, the base under the column semiterete, terminating at the apex in 5 short, divergent teeth. Column 8-10 mm. long, the apex dilated, with narrow lateral wings.
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