Mystery plants

I have a number of plants in the yard that perplex me.  This tree was chopped down once and a number of suckers came up.  Nobody has any idea what it is.

Beneath it are hordes of very tenacious suckers.  I suspect they are related.

 

This looks like some sort of dwarf willow.  I thought it was dead but it's actually beginning to leaf out.

I just discovered this one between a clump of bamboo and a rhododendron in the backyard.

I got excited, thinking it was a flowering currant, but the leaves don't match.  Spiraea, maybe?

And then there's this one.  It's cheery looking enough, but I wish it was something else.

These guys are on the back of the house. No clue about them either.

Then there are the mystery bushes in the northwest corner.

And then there are the plants that are just unwanted.  I was so excited that my peonies survived their ungraceful transplant from Z's house!

Then I noticed more blackberry popped up.  Grrrr.

Anybody who can identify any of these plants gets cookies!