the smallest flowering plant (wolffia arrhiza) and duckweed (lemna turionifera) and pistia

alga algae aphids aquatic plant plants araceae bazaar common duckweeds duckweed floating flora green background invasive species lake leaf leaves lemna turionifera lemnaceae natural nature nile cabbage pistia stratiotes pistieae pond pontederia rootless seaweed shellflower southern ukraine spotless watermeal surface swamp tiny top view water lettuce wolffia