Hybrid Cinquefoil?

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Hybrid Cinquefoil       Potentilla x mixta ?     344
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SSSI, Wanstead Flats, 23 June 2009
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I am uncertain about the i.d. of this plant. It was found on an area of the SSSI. which was scraped at about this time.

It has only four petals, but is not Tormentil Potentilla erecta, it has leaves with five leaflets. There are two possibilities: Trailing Tormentil Potentilla anglica or a hybrid between Tormentil and Creeping Cinquefoil - P. x mixta (=italica). This is most likely.

Gulielma Lister recorded P. anglica from Wanstead Park in 1941, and the possible hybrid is also present there.