Erect epiphytic herbs, with ovoid, ridged, subconic pseudobulbs 2.5-4 cm. long and 2-3 cm. wide, the apex with a single firm, lanceolate to elliptic-lanceolate, plicate, acute leaf 28-60 cm. long and 7-11 cm. wide. Inflorescences short, pendulous, from the base of the pseudobulbs, the rachis enveloped in several papery, spathaceous bracts. Flowers large and conspicuous, very fragrant, white, pale yellow, or yellow with reddish brown or purple dots, the sepals and petals often with more or less circular rings, the base of the hypochile with or without 2 lateral dark purple "eyes" or blotches. Sepals membranaceous, the dorsal sepal free, erect, concave, lanceolate, acute, 6-7.5 cm. long and 1.4-1.6 cm. wide, laterals reflexed, connate at the base, elliptic-lanceolate, acute, 6-7.5 cm. long and 2-3 cm. broad. Petals membranaceous, reflexed, with undulate margins, lanceolate, acute or acuminate, 4.5-5.5 cm. long and 1.0-1.8 cm. wide. Lip fleshy, complexly 3-parted, 5-6 cm. long, the hypochile broadly inflated, obovate in profile, not geniculate, abruptly truncate and concave at the apex, about as broad as long, the lateral margins with broadly falcate thickenings, the canal to the basal concavity ample, the margins not closely appressed; mesochile short, inserted on the concave apex of the hypochile, the lateral margins with 2 elongate, falcate, acuminate, incurved horns; epichile articulated with the apex of the mesochile, elliptic-ovate, acute or apiculate, with more or less reflexed margins. Column elongate, arcuate, terete below, the apical half broadly winged, 4.5-6 cm. long.
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