potamogeton crispus, curled pondweed, curly-leaf pondweed in fresh water lake

biodiversity eurasia europe poland potamogeton crispus potamogetonaceae aquatic biology botany crispleaved pondweed curled curly ecology flora green habitat invasion leaves nature perennial plant plants pond rhizomatus vegetation water weed widespread curly-leaf fresh lake species hydrophyte native introduced noxious north america