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Parrot's-feather

 
Parrot's-feather covering a pond, Dorset
 
 
Aerial parts of plant
 
 
Female flowers in axils of leaves
 
 
Close-up of female flowers
 
 
Whorls of upper leaves
 
 
 
Stem and lower leaves
 
 
Colonies developing from stem nodes
 
 
Submerged stem with roots