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Meadow buttercup

Ranunculus acris
It has tall upright stems with highly divided leaves and bright yellow flowers. Flowers May-Aug.
Soil moisture tolerances: 
It is found on sites with 10-20 weeks dry soil per year and less than 10 weeks of wet soil per year. It is very intolerant of waterlogged conditions.
Soil fertility tolerances: 
It is typically found on moderately fertile sites (10-25 mg P/kg) or P index 1-2.
Traditional medicinal use: 
Acris means bitter hence cattle often avoid it, allowing the stems to grow tall above the cropped grass.
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/ranunculus-acris

BSBI archive: http://archive.bsbi.org.uk/Wats8p237.pdf

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://www.jstor.org/stable/2257092

Link to wildlife trusts: http://www.wildlifetrusts.org/species/meadow-buttercup