Black poplar flowers

Black poplar flowers

Observation - Black poplar flowers. Description: This years flowers .....from tall (40') trees. I remember slightly glossy, heart(ish)-shaped leaves and seeing the down around from last year. I've never noticed the flowers before. I don't know enough to id further. Trees are not narrow crowned though.

This years flowers .....from tall (40') trees. I remember slightly glossy, heart(ish)-shaped leaves and seeing the down around from last year. I've never noticed the flowers before.
I don't know enough to id further. Trees are not narrow crowned though. Populus nigra is dioecious so presumably this is the male?