Saxifraga hirsuta x umbrosa (S. x geum)
A stoloniferous, mat-forming herb occurring as a garden escape in damp, shaded, often rocky places such as woodland, roadside banks and streamsides. Lowland.
This hybrid was cultivated in Britain by 1754 but is not frequent in gardens. It was recorded from the wild in 1854 (Mid-W. Yorks.). It is often confused with S. hirsuta and S. X urbium. S. X geum is fertile and forms exist in a range of intermediates between the parents.
A hybrid which occurs naturally in the Pyrenees and is more frequent in gardens in mainland Europe than S. X urbium.
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