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