Green Leaves Fast Growing Purple Stems

I cut down a lot of Himalayan Blackberry in a park near my house last winter and some new plants and trees are growing there now like Staghorn Sumac, Black Cottonwood and some type of maple.

I don't know what this one is though, any help identifying it is appreciated.
Thanks.

 

Maybe a willow? A close-up of a shoot showing a bud would help.

 

Has some resemblance to Prunus emarginata.

 

Thanks for the replies. I'll try to get a close up of a bud.

 

Here's some more pictures

 

...and here's some more of which looks like the same tree on the other side of the park.
It looks like a long over ripe orange fruit on it similar to an Ash which is also close by.

I guess identification is a lot easier if the shrub or tree has flowers or fruit on it, I'll keep that in mind for the future.

 

Sorry about the multiple posts, but here's one more. This shrub has much lighter green leaves than the other ones, and brown stems. I would wait until next spring and see if it produces any flowers, but the city may cut it down when they are doing maintenance in the park as it's right along side the grass.

 

Prunus emarginata.