These are beautiful white flowers that bloom in alpine areas. The species name alludes to the 8 petals of the flowers. The seed heads are as interesting as the flowers are pretty (see following photographs).
These unripe Mountain Avens seeds are swirled until they ripen and dry out, then they look very different... (see next picture)
When the seeds of Mountain Avens dry and ripen they stick straight out like a kid with a bad haircut! The little fringes help the seeds spread by the wind when they loosen.