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Probably atropurpurea, unless there has been a recent name change.
is correct! My mistake. Just carelessness.
...I often get Pleniflora and Flore Pleno wrong (not on Berberis, obviously).
Sometimes there is a balance between making the contribution before time runs out, or stopping to check the speeling!
How to take close-ups with cheap phone and hand-lens:
Field Guides for Budding Botanists:
Lat/Lng: 55.60452, -2.46379
OS grid ref: NT708346