Mike I am having difficulty in determining whether this is P. lusitania or Prunus serotina. It has red petioles which suggest P. lusitanica but the leaves are light rather than dark green which suggests serontina. The definitive differences iare that lusitania is evergreen while serotina is deciduous and the upper leaf stem of serotina has glands. I can't be sure whether or not the petioles have glands or not in your photos - what do you think?
I have cropped photo 2 to show pair of glands at leaf end of petiole. Leaves are probably darker than shown in photos and petioles are reddish only on the upper side close to the branch (not all leaves). I don't recall its winter appearance so we will have to wait a few months to confirm if it is deciduous.
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