Annette noticed that these two cliff-aster-y looking plants were joined by a runner, the way strawberry or spider plants propagate. (A bit of googling led me to the botanical name for this joining structure: it’s called a stolon). I’ve seen a lot of cliff asters and other related Asteraceae but have never observed this growth habit. I don’t have a positive ID on the plant, but I’ll certainly be looking for other examples while I’m out on the trails.