Carex buekii is a tall sedge, forming large stands in wetlands, particularly in river floodplains across Central Europe and thus on many sites determining the typical appearance of riverine habitats. Our paper aims at increasing the knowledge on ecology of C. buekii and its role in the wetlands. Field data were collected in Poland, the Czech Republic, Slovakia, Hungary, and Italy. Carex buekii usually occurs in nutrient rich habitats, but is also capable of colonising relatively nutrient-poor ones; it grows on both acidic and alkaline soils (pH 3.3-7.4) with diverse concentrations of assimilable elements (Ca, Mg, P, K). One of the most important ecological characteristics of C. buekii is its relationship to the floodplains of watercourses. It seems to be dependent on, or at least very tolerant to regular disturbances by streaming, floods and transport of sediments. Carex buekii usually forms relatively uniform stands of its own association, Caricetum buekii. The species most frequently accompanying C. buekii are Urtica dioica, Calystegia sepium, Galium aparine, Rubus caesius, Phalaris arundinacea, and Cirsium arvense. The sedge also occurs in the understorey of forests with e.g. Alnus glutinosa, Salix fragilis, Padus avium, and Quercus robur. Carex buekii is able to colonise man-made or man-changed habitats such as railway embankments and roadsides or regulated river banks. Taking into account the IUCN Red List Criteria we propose to regard C. buekii as a least-concern (LC).

Directorate of Hortobágy National Park H 4024 Sumen utca 2 Debrecen Hungary

Earth Sciences Department University of Turin Via Valperga Caluso 35 1 10125 Turin Italy

Institute of Botany Plant Science and Biodiversity Center Slovak Academy of Sciences Dúbravská cesta 9 SK 845 23 Bratislava Slovakia

Institute of Environmental Biology University of Wrocław Kanonia 6 8 PL 50 328 Wrocław Poland

Institute of Marine and Environmental Sciences University of Szczecin Adama Mickiewicza 18 PL 70 383 Szczecin Poland

Regione Serramonte 10 1 10010 Andrate Italy

The Czech Academy of Sciences Institute of Botany Department of Vegetation Ecology Lidická 25 27 CZ 602 00 Brno Czech Republic

ul Kochanowskiego 27 PL 73 200 Choszczno Poland

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