Plants usually quite stout, 1-4 m. tall, essentially glabrous throughout, or the bracts and leaves indefinitely papillate; stems straight or somewhat spiral; leaves narrowly elliptic to oblanceolate, acuminate,, broadly cuneate and obscurely sub-auriculate at the base, shortly subpetiolate, 15-40 cm. long, 4-12 cm. broad; inflorescence broadly ovoid to oblong-fusiform, sessile and set closely amongst the upper reduced leaves, 5-25 cm. long; bracts without appendages or only the lowermost somewhat leaf-like, broadly ovate, obtuse, 2.5-3.5 cm. broad, deep yellowish green flushed with crimson within at anthesis, usually with a con-spicuous yellow linear callus; calyx 1 cm. long, broadly 3-dentate; ovary 0.4 cm. long; corolla 4.0-6.5 cm. long, yellowish white, the lobes obovate-oblong; labellum 7-8 cm. long, broadly 3-lobed and sharply reflexed, reddish orange with pale yellow reticulations.
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