Erect, epiphytic herbs with approximate, fleshy, elliptic-ovoid, rather com-pressed, usually longitudinally ridged, diphyllous pseudobulbs 7-11 cm. long and 2.5-4 cm. wide, the bases enveloped in several papery, imbricating bracts the uppermost 1-2 of which are sometimes foliaceous. Leaves ligular to lanceolate, acute, coriaceous, 22-35 cm. long and 2-5 cm. wide, the bases contracted into short conduplicate petioles. Inflorescences usually solitary, elongate, arching, many-flowered racemes equaling or exceeding the leaves, usually produced concurrently with the flush of new growth from the axils of the expanding leaves or sometimes from the bases of the newly completed pseudobulbs. Flowers large and conspicuous, with elongate filiform sepals and petals. Sepals free, widely spreading, long-attenuate, greenish yellow with a few brown blotches near the base, the dorsal sepal narrowly linear-lanceolate, 9-10 cm. long and 0.3-0.4 cm. wide near the base, the lateral sepals somewhat longer, narrowly linear-lanceolate, 10-15 cm. long and 0.4-0.5 cm. wide near the base. Petals subequal to the dorsal sepal, spreading, the apical half greenish yellow, the basal half brown, narrowly linear-lanceolate, long-attenuate, 5-6 mm. long and 3-4 mm. wide near the base. Lip entire, rather rhombic in outline, 3-4.5 cm. long and 1.5-2.5 cm. wide, pale yellow with sparse brown spots and blotches, the basal portion subquadrate to oblong, adnate to the base of the column, the apical portion abruptly dilated and cordate, shortly acuminate or apiculate, the disk with 2 fleshy, minutely puberulent keels, the basal portions erect and parallel, terminating at the apex in 2 larger subquadrate spreading lobules. Column very short, stout, 3.5-5 mm. long, the base without a foot.
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