BRUNO PETRIGLIA / SCIENCE PHOTO LIBRARY BRUNO PETRIGLIA / SCIENCE PHOTO LIBRARY
Canadian fleabane flowers (Conyza canadensis). This plant is a traditional North American herbal medicine. It was taken as a snuff to stimulate sneezing during a cold and burned to create smoke that repelled insects. In modern medicine it is used to treat bleeding haemorrhoids, diarrhoea and inflammation of the throat.
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