Erect, epiphytic herbs with fleshy, approximate, elliptic-ovoid, compressed, monophyllous pseudobulbs 2.5-5.5 cm. long and 2-3 cm. wide, the bases enveloped in several papery, imbricating bracts which become more or less fibrous with age. Leaves coriaceous, ligular, obtuse to acute, 15-40 cm. long and 2-4.5 cm. wide, contracted below into short or elongate, conduplicate petioles. In-florescences 1 to about 6 slender, 1-flowered scapes 5-12 cm. long, produced singly or in loose fascicles from the bases of the pseudobulbs. Flowers relatively large. Sepals free, subequal, spreading, yellow, white, or tan, sometimes shaded pink or lavender, ligular, obtuse to lanceolate, acuminate, 2.5-4 cm. long and .3-.6 cm. wide, the laterals adnate to the column foot, forming a short, rounded or subacute mentum. Petals subequal to the dorsal sepal, white or pale yellow, lanceolate, acute to acuminate, 2.2-3.5 cm. long and .25-.4 cm. wide. Lip 3-lobed near the apex, 10-15 mm. long and 6-8 mm. wide when spread out, white marked with lavender to yellow marked maroon, contracted at the base and articulated with the column foot, the lateral lobes erect, the obtuse to acute apices projecting, the mid-lobe rhombic-ovate to obovate, obtuse to acute, fleshy and more or less rugose or minutely papillose on the upper surface, about 1/3 the total length of the lip, the under-surface of the apex transversely thickened or with an acute central keel; the disk with a ligular callus about 3,4 the length of the lateral lobes. Column semi-terete, somewhat arcuate, about equaling the lateral lobes of the lip, the base produced into a short foot.
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