leaves in pairs, clear veins, slightly curled upwards, stems green
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Thank you to the gentleman who helped identify this when I first posted it as a possible young ash tree, and apologies for accidentally deleting my previous observation with your added notes!
Lat/Lng: 51.765941, -1.4508994
OS grid ref: SP379076
next to a newly laid hawthorn hedge marking the boundary of a new lake based nature reserve just outside Witney