Lex. in P.de La Llave & J.M.de Lexarza, Nov. Veg. Descr. 2: 10 (1825)
A tall terrestrial herb to 1 m tall, with solitary or less commonly clustered, erect stems growing from a stout short underground rhizome. Stems stout, terete, densely coarsely hairy, leafy along length. Leaves to 20 or more, plicate, ovate to ovatelanceolate, acute to acuminate, sheathing at the base, 5-18 cm long, 2-6 cm wide, ciliate, hairy on both surfaces. Inflorescence to 10 cm long, to six-flowered, the flowers produced singly in succession; bracts leaf-like, lanceolate to elliptic-ovate, acuminate, 5-10 cm long, hairy. Flowers large, bright yellow with red marks on the staminode and on the incurved basal margins of the lip; pedicel and ovary 3-5 cm long, densely coarsely hairy and glandular. Dorsal sepal erect, elliptic, 3.4-6 cm long, 2-3.5 cm wide, ciliate, finely densely glandular hairy on outer surface. Synsepal similar to the dorsal sepal but oblong-elliptic, 3-6 cm long, 2-3 cm wide. Petals spreading-incurved, oblong-elliptic, acute, 4.8-7 cm long, 2.3-3 cm wide, ciliate, glandular hairy on inner surface especially near base. Lip deeply saccate, obovoid-globose, 4-7 cm long, 3.5-4.5 cm across, the margins incurved around the broad mouth, with translucent windows all over the surface. Column 1.1-1.5 cm long; stalk glabrous; staminode convex, cordiform to trullate, acute to apiculate, 1-1.5 cm long, 1-1.2 cm wide, ciliate.