Erect, caespitose, epiphytic herbs with linear or narrowly ovoid, rather compressed pseudobulbs up to about 5 cm. tall and 2 cm. wide, the truncate apices with 1 or 2 leaves, the bases enveloped in several imbricating bracts the uppermost 2 of which are conspicuously foliaceous. Leaves narrowly linear to elliptic-lanceolate, acute, subcoriaceous, 4-18 cm. long and 0.8-3.5 cm. wide, contracted below into very short conduplicate petioles. Inflorescences 1 or 2 slender, erect or arching panicles usually much exceeding the leaves, up to about 75 cm. long. Flowers dimorphic, each lateral branch of the inflorescences terminating in a single normal flower averaging about 2 cm. long and 1.2 cm. wide, subtended by many very dissimilar, small, stelliform, abortive, sterile flowers. Perianth segments of the sterile flowers broadly spreading, narrowly linear to spatulate, yellowish, 3-4 mm. long, the lip generally entirely aborted. Normal flowers with the sepals free, elliptic-lanceolate to ligular, shortly acute to obtuse, the bases shortly clawed, the blades often with undulate margins, yellow blotched with reddish brown, 6-10 mm. long and 2-3 mm. wide. Petals elliptic-oblong to obliquely obovate-spatulate, obtuse to subacute, clawed at the base, yellow blotched with reddish brown, 7-10 mm. long and 2.5-3.5 mm. wide. Lip broadly panduriform, 10-12 mm. long and 10-15 mm. wide, subequally 4-lobed, the lateral lobes broadly triangular, obtuse, or rounded, the anterior margins converging and forming a short isthmus or narrow, median constriction above the abruptly dilated, spreading, transversely reniform, 2-parted, bright yellow mid-lobe, the disk with an erect, fleshy, tuberculate callus terminating at the apex in 3 short teeth. Column short, 3-4 mm. long, with 2 very prominent lateral wings.
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