Scirpus radicans is a species of flowering plant belonging to the family Cyperaceae.
Its native range is Europe to Japan.
Perennial herb 60âÂÂ125(150) cm tall. Rhizome short. Stems with long lateral shoots that bend in an arc to the soil and root at the top. Leaves up to 2 cm wide, flat. Perianth setae 2âÂÂ3 times longer than the nut, sinuous, almost smooth. Spikelets pointed, lanceolate, blackish, 5âÂÂ8 mm long, sitting 1 at the ends of smooth branches of a spreading paniculate inflorescence 10âÂÂ20 cm long. Spikelets oblong-ovate to narrowly ovate, 5âÂÂ8 àâ 2 mm, abundantly flowered. Spike scales densely arranged, oblong, â 2 mm, membranous, both surfaces dark grayish-black, midrib pale yellow, base sometimes straw-colored, margins at apex ciliate, apex rounded. Anthers â 1 mm, linear-oblong. Nut pale yellow, obovate, â 1 mm, compressed on 3 sides. 2n = 56.