Erect, terrestrial herbs with fleshy, ovoid, somewhat compressed, usually smooth pseudobulbs 5.5-8 cm. tall and 3.5-5 cm. wide, the truncate apices with 1 to 3 leaves, the bases enveloped in 4-6 imbricating bracts the uppermost 2 or 3 of which are conspicuously foliaceous, the blades persistent, not articulated and not separating by a suture near the base. Leaves and bract blades linear-lanceolate, acuminate, subcoriaceous, 45-90 cm. long and 2-3 cm. wide, rather rigidly erect, with a strong central keel, the margins somewhat conduplicate, particularly for the lower half. Inflorescences 1 or 2 erect or arching, many-flowered panicles equaling or exceeding the leaves, produced from the lateral bases of the pseudobulbs. Flowers of moderate size, in fresh material averaging about 3 cm. in diameter when spread out. Sepals subequal, free, spreading or reflexed, greenish or brownish olive, usually with undulant margins, the dorsal sepal oblanceolate, acute, 10-12 mm. long and 4-5 mm. wide, the lateral sepals lanceolate, acuminate, 13-15 mm. long and 3.5-4 mm. wide, with a pronounced dorsal keel. Petals subequal to the dorsal sepal and similarly colored, spreading or reflexed, with undulant margins, obliquely oblanceolate, acute, 12-14 mm. long and 4-5 mm. wide. Lip panduriform, 3-lobed, bright yellow, about 1.5 cm. long and 1.5 cm. wide, abruptly contracted at the base and adnate to the base of the column, the small lateral lobes oblong, obtuse or obscurely auriculate, the anterior margins confluent with the margins of the broad central isthmus, the mid-lobe dilated, 2-lobed, transversely subreniform, the disk olive-green, with a prominent, fleshy, white, 7-toothed callus. Column short, with prominent, lateral wings.
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Plants mostly epiphytic, sometimes terrestrial, to 100 cm (excluding inflorescence). Stems modified into prominent, compressed pseudobulbs, subtended by 1–3 leafy bracts. Leaves 3, apical [2, lateral] on pseudobulb, 2 lateral; blade linear-lanceolate, 60–100 × 3–5 cm, not leathery. Inflorescences erect-arching to pendent, 100–250 cm; bracts 5–8 mm. Flowers yellow with numerous small brown spots; sepals reflexed, oblong-elliptic, clawed, 16 × 3.5–5.5 mm, margins somewhat undulate, apex acute; petals reflexed at least at apex, oblong-elliptic, clawed,10–14 × 5–7 mm, apex acute; lip mostly yellow with brown patches near lip callus, 11–15 × 8.5–11 mm, apiculate, middle lobe about as wide as combined lateral lobes, isthmus 5–6 mm wide; callus of central ridge with 3–5 paired lateral ridges; column yellow, with pair of erect, axe-shaped, apical wings; pedicellate ovary [15–]24 mm. Capsules pendent, ellipsoid, 18–20 × 8–20 mm.
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