The message from Charles contains these words:
I think that article must have meant rhus typhina, aka staghorn sumach. (note, this is not rhus vernix, your poison sumach).Rhus typhina is an extremely handsome ornamental tree
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quite commonly planted as a garden tree in the UK, but only because it poses very minimal risk of skin irritation. It's nowhere near as toxic as poison oak, poison ivy, or poison sumach. It's not the same plant as US poison ivy, though it is in the same family. (Anacardiaceae)
Janet