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Marsh marigold

Caltha palustris
Flowers March-May. The most conspicuous golden flower of early spring on damp meadows. Very large flat leaves.
Soil moisture tolerances: 
It is found on sites with less than 10 weeks dry soil per year and 10-20 weeks wet soil per year.
Soil fertility tolerances: 
It is typically found on moderately fertile sites (10-25 mg P/kg) or P index 1-2.
Traditional medicinal use: 
Alternative names are kingcup, molly blobs or in Shakespeare “Marygold.” The sap is irritating to the skin. ‘Palustris’ means ‘of the swamp’. It is an ancient plant that is thought to have survived the ice age and flourished after the retreat of the glaciers.
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/caltha-palustris