Sedge family (Cyperaceae)
Perennial with below-ground stolons. Stems 60-100 cm tall, bluntly three-angled, hollow inside. Leaves arranged helically, pale green, flat, 8-12 mm wide, with a deep furrow down the middle and main vein standing out on the upper side. Margins rough. Inflorescence large, forming a many-branched spray at the apex. Spikelets forming heads at ends of branches. Flowers Jun.-Jul.
Grows on moist and wet, fertile soils; hence in riparian and alder-currant forest, though also on moist meadows and in permanently marshy places.
Descriptions devised by the team at the Independent Department of Forest Botany, Warsaw University of Life Sciences, i.e. L. Witkowska-Żuk, K. Marciszewska, W. Ciurzycki, A. Obidziński and P. Zaniewski.