Silene menziesii Hook.
A small-flowered Silene found in the understory of coniferous forest, widespread in most of the western United States. There are several subspecies; I am not sure which my plants are.
Plant habit at Junction Creek Campground north of Durango, La Plata County, Colorado, 1 Jun 2010.
A flower at Junction Creek Campground, 1 Jun 2010.
Side view of a flower at Junction Creek Campground, 1 Jun 2010.