Eleocharis plana

Perennial with creeping rhizome. Culms tufted, flat to slightly plano-convex, to 80 cm high, 2–4 mm diam. Spikelet narrow-cylindric, 10–20(–40) mm long; glumes acute, faintly keeled, margins broadly hyaline, straw-coloured, red-tinged to ± evenly dark red-brown, 3.5–4 mm long; hypogynous bristles 6–8, slender, flattened and broad at the base, retrorsely scabrous, about as long as nut; stamens 3; anthers 1.5–3.1 mm long; style 3-fid. Nut biconvex, with angles obtuse, obovoid, shining, bright yellow to dark brown, 1.2–1.8 mm long, c. 1 mm diam., external cells minute; style-base about half as long and wide as nut. Flowers spring–summer.