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Monophadnoides rubi
Spiny caterpillar or possibly sawfly larva; transparent green.
Mountaintop with barely any trees and lots of Dwarf Cornel, Crowberry, and other low-growing plants
Thanks Lauren, sounds right. They feed on Rubus species. We have a few, namely salmonberry and nagoonberry, and I think I saw a lot of nagoonberry nearby.
Hi Machi, I think I found your larva, it is a Sawfly, the Raspberry Sawfly (must feed on other things too) Monophadnoides rubi.