Perennial, rhizomatous, aromatic herb; leafy stems 1–2 m tall; rhizome subterete, up to 1 cm in diameter, profusely branched, red-brown, covered with thin, subovate scales up to 6 cm × 4 cm and bearing thin, fibrous, pale brown roots; stem unbranched, mainly formed by the leaf sheaths, subterete, up to 1 cm in diameter but at base usually thickened up to 3 cm diameter. Leaves alternate, distichous, simple; sheaths covering each other, yellow-green, with prominent veins and scarious, ciliate margins; ligule deeply bilobed, thin, ciliate, lobes acute, up to 3 cm long; petiole 4–10 mm long, deeply grooved above; blade elliptical to oblong, 10–30 cm × 2.5–6 cm, obliquely obtuse at base, cuspidate at apex, margin entire, glossy dark green above, paler green and often a bit reddish below, lateral veins fine, pinnately arranged but parallel, making a very sharp angle with the midrib, 4–9 per 5 mm above, 12–16 per 5 mm below. Inflorescence a shortly stalked head arising from the rhizome near the base of a leafy stem, sometimes situated at the end of a rhizomatous runner, up to 5-flowered; peduncle up to 7 cm long, covered by imbricate, purplish-brown, subovate scales 2.5 cm × 1.5 cm; head covered with imbricate, purplish-brown, ovate to square bracts up to 4.5 cm in diameter; each flower surrounded by a scarious, suboblong bract up to 6 cm × 2 cm, bidentate, ciliate. Flowers bisexual, zygomorphic; calyx spathaceous, up to 4.5 cm × 1 cm; corolla tubular, 3-lobed at apex, white to pale violet, tube up to 4.5 cm long, densely woolly in upper 2 cm, lateral lobes ovate-oblong, up to 4 cm × 2 cm, dorsal lobe up to 4 cm × 3 cm, labellum obovate in outline, with a half-tubular fleshy claw up to 3 cm × 1.5 cm and a subovate to orbicular lobe up to 3 cm × 3.5 cm, thin, slightly notched, yellow at throat inside; fertile stamen 1, filament fleshy, slightly rounded, 6 mm × 5 mm, connectivum fleshy, at apex with 2 lateral horns 4 mm long, thecae 2, narrowly ellipsoid, about 11 mm × 1 mm; ovary inferior, 3-locular, style thin, terete, up to 5 cm long, stigma funnel-shaped, 2 mm wide, ciliate, top of ovary provided with 2 (sometimes more) lobed, fleshy outgrowths (probably nectaries), partly clasping the style. Fruit an indehiscent, subconical berry up to 6 cm × 3.5 cm, usually showing 3 longitudinal furrows but sometimes more, shiny green when immature, turning bright red at maturity, with 3 cells containing 45–65 seeds each. Seeds subglobose in outline but usually somewhat angular, 2–5 mm in diameter, testa finely lined, glossy brown, hilum circular, whitish, aril thin, a bit fleshy, completely covering the seed. |