Chlorocyperus glomeratus (L.) Palla, Allg. Bot. Zeitschr. 6: 61. 1900; Nyárády, Fl. Rep. Soc. Romania 11: pl. 119, fig. 2. 1966; Schultze-Motel in Hegi, Ill. Fl. Mitteleur., ed. 3, II, 2, 1: 86, fig. 50. 1986.

Annual, or possibly caespitose biennial/perennial, (10-)30-80 cm. Rhizome absent or short. Stem 1.5-4 mm diam., trigonous, smooth. Leaves shorter than stem; sheaths up to 20 cm, soft, yellowish or greenish, mostly with reddish tint, often brown-dotted, mouth margin almost straight; blades up to 30 cm, 2-8 mm wide, green or greyish green, flat, keeled, margins narrowly recurved, margins and mid-nerve below as well as mid-nerves of each half of lamina above scabrous, espcially towards long, scabrous apex. Inflorescence an anthelodium, 2.5-10 cm; bracts up to 40 cm; primary branches 3-7, to 70 mm; secondary anthelodia 15-35 mm, with lowest bracts longer than secondary anthelodium; cluster of spikes 15-25 mm, sessile or subsessile, cylindrical, elongate or almost globose, with more than 50 spirally arranged spikes; spikes 4-8 mm, compressed, with 8-16 glumes, glume-like bract c. 1.4 mm, glume-like prophyll c. 1.4 mm, bi-nerved; rachis 4-angled, flat, brown, internodes c. 0.75 mm, winged; glumes c. 2.1 mm, cymbiform, blunt or acute, mid-nerve distally pronounced, smooth or slightly scabrous, sides brown, with 1-2 nerves, margins and apex scarious. Nut 1.3-1.4 x 0.5 mm, elongate, with almost linear sides, trigonous, greyish-brown or brown, finely reticulate.

Fl. Per.: September.

Type: ”Habitat in Italiae paludosis Seguier”; Linn. 70.23 (LINN); microfiche!.

River shores, rice fields; Distribution: From C and S Europe to Caucasus and NW Iran, Turkestan, Uzbekistan, Kashmir, through Siberia to N. China and Japan.