Plants to 1.5 m tall, with a stout, rather short rhizome 2-3 mm in diam. Stem erect, ca. 1 cm in diam., pubescent, with several sheaths at base and 9 or 10 leaves above; sheaths 2.5-9.5 cm, pubescent. Leaf blade elliptic-oblong to elliptic-lanceolate, 21-33 × 7.7-10.5 cm, abaxially pubescent, base contracted into petiole, margin ± ciliate, apex acuminate; petiole 1-2 cm. Inflorescence terminal, racemose, 7-flowered; peduncle ca. 21 cm; rachis ca. 15 cm, with reddish hairs; floral bracts ± reflexed, linear-lanceolate, 1-2.8 × 0.2-0.3 cm, with reddish hairs; pedicel and ovary ca. 4.5 cm, densely glandular hairy and brownish pilose. Flowers yellow, with purple spots on lip. Dorsal sepal ovate-elliptic, 3.5-3.9 × 2.2-2.5 cm, abaxially with reddish hairs, apex cuspidate-acuminate; synsepal broadly ovate-elliptic, slightly wider than dorsal sepal, abaxially also hairy, apex shallowly 2-lobed. Petals suboblong-ovate, 3-3.6 × 9-11 mm, reddish hairy on adaxial veins and abaxial surface; lip deeply pouched, obovoid-ellipsoid, 4-4.6 cm, ca. 3 cm in diam., glabrous on outer surface, hairy toward inner base. Staminode subligulate, ca. 5 × 1.5 mm, base stalked, apex obtuse, slightly upcurved. Fl. Jul.
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