An unusual and very pretty tree in the way the branches hang down in long strands. This is in the Botanic Garden in Cambridge, and there is a name tag on the tree that identifies it. The Wikipedia entry says:
Populus simonii, Simon’s poplar, Simon poplar, or Chinese cottonwood, is a species of poplar native to northeast China and to Mongolia, and commonly planted as a street tree in cool temperate areas of Europe. There have been introductions into North America, South Africa, Australia and New Zealand.
A ‘street tree’ – how lovely to think of these lining a street.