It's Rosa acicularis!

Or "prickly wild rose", they have very small slender thorns that are like getting a million splinters.
Very nice sweet smell when they bloom, and then the flowers become something called rosehips that can be eaten in the fall.
My favorite thing about them is that they are host to the gall wasp Diplolepis polita, the spiny looking galls they make are so cool!

This is not Diplolepis polita herself, but a completely different kind of wasp called an inquiline gall wasp who deposits her eggs in already formed galls!! Isn't that awesome!!!!! EVERYTHING'S CONNECTED!!!!!!!!