Menzies' Catchfly

On July 27th, a couple of us noticed several of these very small, white flowers growing at the base of a tree in Bragg Creek Provincial Park. A casual glance in their direction brought Mouse-eared Chickweed to mind, but somehow, that just didn't feel right. After all the rain and hail we'd had recently, it almost looked like the petals may have been damaged. However, we were told that this plant was Menzies' Catchfly (Silene menziesii) - a plant that I had never seen or even heard of before. (Note: I'm still not 100% sure that the ID we were given is the correct one).