Water Aven
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Geum rivale
Common & widespread throughout Britain.
The flowers' stigmas mature before the stamens.
It begins flowering a little earlier than G. urbanum, so early pollinations are within the gene-pool of the single species.
The seeds of Water Avens are burr-like, and are distributed after being caught in the coats of rabbits and other small mammals, and by rhizomal growth.
Flowers from May-September.