Can you help me identify this tree?

[Devon]

I'm in zone 4b thanks

 

[Sheal]

Could we have a close up shot of leaves and any flowers please @Devon. It's difficult to identify plants at a distance.

 

[Devon]

Sorry I think the uploader reduces resolution of images. It is producing a white fluffy material at the moment. Additional photo attached.

 

[Tjohn]

I believe it is a Cottonwood tree.

 

[Marck]

This is a Willow (Salix) with ripe fruit. The exact species is difficult to determine as there are many similar species.
Many willows will produce seeds with dispersal hair ('cotton'), similar to their cousins the Poplars and Cottonwoods (Populus).
Both Salix and Populus are in the Willow Family (Salicaceae)

 

[Devon]

This is a Willow (Salix) with ripe fruit. The exact species is difficult to determine as there are many similar species.
Many willows will produce seeds with dispersal hair ('cotton'), similar to their cousins the Poplars and Cottonwoods (Populus).
Both Salix and Populus are in the Willow Family (Salicaceae)

Thank you so much!!