a sharp spike hedge growing outside my office
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This image is of a sample I took from the hedge outside the office. To get the image I laid it flat on a scanner and scanned it as if it was a photo or document. It seems to have come out well and I recommend it as a way of getting a good image of a plant branch or leaf.
Yes it's a Pyracantha, a Firethorn.
APHOTO Wildlife Image Libraries
Berberis thunbergii is deciduous, and would not have had leaves at the time you spotted it.
Lat/Lng: 51.581183233835, 0.45498847961426
OS grid ref: TQ701897