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

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