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A herb which grows 0.6-2 m tall. It keeps growing from year to year. It has a stout rootstock. The leaves have stalks. They are 3.5-14 cm long by 1-9 cm wide. The lower leaves have long stalks but the upper leaves do not have stalks. They are oval. The flowers are of both sexes. They are reddish and occur in long rings. The fruit is a brown nut. The flower has sepals which are hooked. These stay ringed around the fruit.
Perennial herb, up to 1.5 m high. Stems straggling. Leaves petiolate; blade narrowly oblong-ovate to narrowly linear-ovate, up to 450 x 90 mm, base cuneate, apex obtuse; petioles of basal leaves up to 300 mm long. Ocrea entire. Flowers: borne in whorls in terminal, racemose panicles; pendulous; perianth with margins of inner segments with 5 or more hooked teeth on each side, yellow or greenish; Oct.-Jan.
Leaf lamina 25–45 × 7–9 cm, oblong-lanceolate to linear-lanceolate, obtuse or rounded at the apex, cuneate at the base, entire or crisped on the margin, glabrous or with scattered papillae on the undersurface, the upper leaves smaller; petiole of basal leaves 13–30 cm long.
Outer perianth segments brownish, 1–1.5 mm long, oblong-lanceolate; inner perianth segments dark brown, accrescent, 3–4(4.5) × 1.5–2 mm, triangular, usually with an obtuse or lanceolate apex, with or without tubercles but with 5–6 hooked teeth 1–2 mm long on the margin.
Flowers hermaphrodite, pedicellate, pendulous, in whorls borne in terminal racemose panicles; the basal whorls in the axils of foliaceous bracts; pedicels filiform, articulated near the base.
Nut pale brown, shiny, 2–2.5(3) × 1.5–2 mm, sharply trigonous.
Stems green to greenish-brown, hollow, glabrous, striate.
A stout, ± straggling perennial herb up to 1.8 m tall.
Ocrea 0.5–3 cm long, striate, entire, ± caducous.
Stamens 6; filaments filiform; anthers oblong.
Ovary trigonous.
