Erect, epiphytic herbs with stout, oblong-ovoid to elliptic-ovoid, somewhat compressed, monophyllous pseudobulbs 3-5 cm. tall and 2-3 cm. wide, the bases enveloped in several long, papery, imbricating bracts which become fibrous with age. Leaves coriaceous, linear-lanceolate to elliptic-lanceolate, acute, 25-50 cm. long and 2.5-4 cm. wide, contracted below into short or elongate, conduplicate petioles. Inflorescences usually about 3 erect, 1-flowered scapes 9-14 cm. long, produced from the bases of the pseudobulbs, enveloped in several papery, acute, tubular bracts. Flowers conspicuous, the largest of the genus in Panama. Sepals subequal, free, widely spreading, ligular, broadly obtuse, white on the outer surfaces and pale yellow within, 4-5 cm. long and 1.0-1.2 cm. wide, the laterals adnate to the column foot, forming a prominent, acute mentum. Petals ligular, shortly subacute, the apices incurving in natural position, white without and pale yellow within, 3.5-4 cm. long and .5-.7 cm. wide. Lip conspicuously 3-lobed, deep yellow, margined white, about 2.5 cm. long and 1.8 cm. wide when spread out, contracted at the base and articulated with the foot of the column, the lateral lobes erect in natural position, the rounded apices somewhat projecting, mid-lobe ovate, obtuse, about 1/3 the total length of the lip; the disk with a linguiform, laterally bicarinate, acute callus, about % the length of the lateral lobes. Column semi-terete, somewhat arcuate, about equaling the length of the lateral lobes of the lip.
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