The Arbutus x andrachnoides is a naturally occuring hybrid of the Strawberry tree (Arbutus unedo) and the Greek Strawberry tree (Arbutus andrachne) that is found in Greece and Cyprus. The pictures in this post however come from a tree in the Madrid Botanical Garden.
The leaves and flowers of this hybrid are quite similar to those of the "Madrono" (Strawberry tree) but the bark is quite different. For one it is quite flacky and the outer brown, paper thin layer peels off to reveal a lime green with brownish patches, smooth layer beneath.
This hybrid is grown mainly for ornamental purposes and not as a fruit bearing tree as it is not known to produce nearly as well as the Arbutus unedo.