Muralis and vivipara live there together: I've photographed vivipara at one side of the path, and muralis at the opposite side.
I think Vipera walser could also live there, but I've seen only a small (female, I suppose) aspis. The weather was very bad: too hot the first day, and too cold and rainy the other two.
Unfortunately, the owner of the small guest house in this valley kills every "viper" seen or met: but the only picture I saw of those highly dangerous "vipers" was actually one of a beautiful Coronella austriaca found in a nearby valley...