Veisiejų regioninio parko ežerų augmenija [The vegetation of lakes in Veisiejai Regional Park]. – Botanica Lithuanica, 4(3): 267–284

The results were obtained during the investigations on lake macrophyte communities of Veisiejai Regional Park in 1994–1997. The species composition and the structure of macroophyte communities of 15 lakes were examined. 10 investigated lakes are of fregmentary or of stripy-fragmentary and 5 small investigated lakes are of entire stripy or quagy overgrowth degree. Totally 62 macrophytes species were found during the research. Some of them like Phragmites australis, Schoenoplectus lacustris, Nuphar lutea, Potamogeton natans, P. lucens, P. perfoliatus, Elodea canadensis, Ceratophyllum demersum, were forming the most frequent communities in the lakes examined. 4 macrophyte species enlisted into Red Data Book of Lithuania were found: Cladium mariscus, Ceratophyllum submersum, Hydrilla verticillata, Najas marina. Two species of the family Nitellaceae mucronata and N. flexilis – found in investigated lakes are being recommended to enlist into the Red Data Book of Lithuania.

Keywords: lake macrophytes, species, flora, communities, overgrowth, Veisiejai Reginal Park.