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Leaves 8–16 × 0.2–1.7(3.5) cm, linear-lanceolate, acute and apiculate at the apex, narrowed to the base, sometimes crisped on the margins, pubescent or with silky hairs on both surfaces, sometimes with some glands.
An erect or procumbent perennial herb, sometimes forming mats, appressed hairy on the upper parts, more rarely glabrous throughout or covered with long white hairs.
Ocrea brownish, 1–1.8 cm long, glabrous, membranous, with a spreading or recurved herbaceous limb 1–9 mm long, ciliate at the apex and hairy outside.
Stems reddish-brown, up to 2 m or more long, sometimes rooting at the lower nodes, longitudinally striate, hollow in the lower part.
Nut dark red-brown to black, shiny, smooth, 2.5–3 × 2.5–3 mm, ± lenticular, convex, the persistent style base forming a beak.
Perianth white-pink, pink or bluish-pink, c. 4.5 mm long, 5-lobed; lobes 2.5–3 mm long.
Ovary 1.5 × 1.5 mm, compressed; styles 2, 1–2 mm long united for half their length.
Stamens 7; filaments 2–2.5 mm long, filiform; anthers pink, 0.4 × 0.2 mm.
