Caespitose, epiphytic herbs with strongly flattened, foliaceous stems 7-40 cm. long and 0.8-1.5 cm. wide. Leaves narrowly triangular as seen in profile, acute, 1-3 cm. long and 0.4-0.8 cm. wide. Inflorescences very short, 1-to 3-flowered racemes produced from the axils of the upper leaves. Flowers very variable in size, but often relatively large and attractive, the pedicels subtended by papery, ovate-cordate bracts. Sepals usually strongly reflexed, sometimes slightly concave, yellow, the laterals sometimes spotted with red, elliptic-oblong to ovate, obtuse to shortly acute, 4-8 mm. long and 3-5 mm. wide. Petals yellow, sometimes spotted red, oblong-ovate to broadly and obliquely ligular, obtuse or slightly retuse at the apex, antrorsely incurving in natural position, the lateral margins usually more or less undulate and strongly reflexed, 4-8 mm. long and 3-6 mm. wide. Lip complexly 3-lobed, 7-12 mm. long and 6-14 mm. wide, yellow with red or reddish brown markings at the base, the lateral lobes linear-ligular, obtuse or obliquely acute, spreading or antrorsely incurving in natural position, the mid-lobe more or less pandurate, 4-lobulate, the basal half distinctly narrower than the apical half, the small basal lobules rounded or obliquely triangular, strongly reflexed in natural position, sometimes confluent with the bases of the linear lateral lobes, the center of the mid-lobe with a distinct constriction which is often prolonged into a short isthmus, the apical lobule usually abruptly dilated, 2-parted with a deep central sinus, the disk with a narrowly flabellate or sometimes linear, strongly verrucose callus, extending to the median constriction. Column with spreading, minutely denticulate or crenulate lateral wings.
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