Erect epiphytic herbs, with pseudobulbs and leaves typical of the genus. Inflorescences usually of all staminate or all pistillate flowers. Flowers in either case large and fleshy, differing from one another only in the structure of the column; lip sessile or very nearly so. Staminate flowers those most frequently seen: Sepals subequal, free, spreading, yellowish green, the dorsal sepal erect, lanceolate, acute, concave, 9-11 cm. long and 1.6-1.7 cm. wide, laterals spreading, subfalcate, lanceolate, acute, 6.5-7.5 cm. long and 1.4-1.6 cm. wide. Petals spreading, elliptic-lanceolate, subfalcate, acute, yellowish green, 7-8 cm. long and 2-2.5 cm. wide. Lip fleshy, sessile or very nearly sessile at the base, elliptic-lanceolate, acute, convex toward the middle, not strongly ventricose, 6-6.5 cm. long and 2.5-3.2 cm. wide, white with a dark green, ovate, obtuse depression below the fleshy, triangular, acute, projecting, dark green, basal callus. Column elongate, slender, terete, arcuate, 2.8-3.2 cm. long, dilated at the apex. Anther and pollinia normal. Pistillate flowers less frequently seen: identical with the staminate except for the structure of the column, which is short and stout with two fleshy, auriculate, lateral wings at the apex; stigma normal.
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