Terrestrial. Rootstock creeping. Leafy stems erect, very stout, reaching to a length of 20–24 ft. Leaves 1–2 ft. long, 4–5 in. broad above the middle, acute, quite glabrous on both sides, narrowed gradually to a short broad petiole; ligule truncate, above 1/2 in. long. Scapes in tufts from the rootstock, 4–10 ft. long, 1 1/2 in. diam.; spikes oblong, 5–6 in. long, 3–4 in. diam.; lower bracts, 2 1/2 in. broad. Calyx 3/4 in. long; lobes shorter than the tube. Corolla-lobes oblong, acute, 2 in. long. Lip not much longer than the corolla-lobes, fimbriate at the margin; anther placed above the middle of its acute petaloid connective.
in Journ. Bot. 1887, 131. —Schumann in Engl. Jahrb. xv. 422.