 "betulifolia") is an uncommon native tree in Britain.Black poplars are associated with alluvial soils in river valleys and floodplains generally south of a line from the River Mersey to the estuary of the Humber with particular concentrations across the Midlands from the Welsh Marches to East Anglia and notably in the Vale of Aylesbury (Aylesbury Vale).A male clone (cloning) was much planted in the suburbs of Manchester in the late 18th century as it grew well in the polluted atmosphere and it became known as the ‘Manchester poplar’.