Perennial herb, 0.75-1.60 m high; rhizome erect, moderately branched. Leaves terete, flexible, basally dilated; sheaths purplish, fibrous. Peduncle striate. Spathe equalling or exceeding inflorescence, either green and erect or grey papery and ± spreading. Bracts firm, closely imbricate; lower ones broadly lanceolate, dull green or brown; uppermost ones tubular, dull green. Inflorescence composed of 10-80(-120) cymes; flower usually single in axil of uppermost bract; segments yellow; anthers oblong. Flowering time Jan., Dec. Capsule subglobose, smooth or slightly tuberculate, greyish green to brown.
Rhizomatous perennial, 40-130 cm. Leaves terete. Flowers in a dense inflorescence of 10-100 short cymes, yellow. Capsule subglobose, 4-8 mm.