Again, a species with no common name in English, this is called Korean poplar by the Finns. This poplar grows naturally in north-eastern China, Korea, and the Russian far east. It has not been commercially grown in Finland, and elsewhere in the western world it is rare.
Large wrinkled leaves, whose under-surface is shiny white, make this an interesting species. It tends to break leaf early in spring, in Helsinki as early as April, but seems not to suffer from spring frosts.
Unlike so many Western related species, oriental poplars do not produce suckers, neither does Korean poplar.