cut leaf with air cells of floating plant pontederia crassipes (eichhornia crassipes

alga algae aquatic plant araceae biomass closeup common duckweeds hyacinth water crassipes duckweed ecosystem eichhornia floating flora foliage fresh freshwater green background flower invasive lake leaf leaves lemna lemnaceae nature petal pond pontederia pool rootless seaweed spotless watermeal surface swamp tiny top view tropical weed wolffia cut air cells