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Amphibious bistort

Persicaria amphibia
Flowers July-September. Deep pink spikes. Has two forms, adapted to both water and land habitats.
Soil moisture tolerances: 
It is found on sites with less than 10 weeks dry soil per year and more than 20 weeks wet soil per year. It is a plant of wetter places.
Soil fertility tolerances: 
It is typically found on moderately fertile sites (10-25 mg P/kg) or P index 1-2.
Suitability for floodplain living: 
Amphibious bistort copes with floods by rapidly extending its stem to allow its leaves to float on the water’s surface just like a water lily.
Further information: 

Click here for a link to the online Atlas of the British and Irish Flora with details of the plant ecology, distribution, photos and habitats: https://www.brc.ac.uk/plantatlas/index.php?q=plant/persicaria-amphibia

Link to the Natural History Museum: http://www.nhm.ac.uk/our-science/data/uk-species/species/persicaria_amphibia.html

Click here for a link to the biological flora; a summary of all that is known about the ecological requirements of the plant, published in the Journal of Ecology: http://onlinelibrary.wiley.com/doi/10.1046/j.1365-2745.2001.00571.x/abstract