Hi Christine!
It has a certain chickweed look about it, I found one which has leaves I think the same, not sure if the flowers quite match up.
Cerastium beeringianum
http://intermountainbiota.org/...
Flowers on Minuartia drummondii look closer but it'd difficult finding photos showing the leaves well.. the flowers look bigger than the leaves.
http://www.wildflower.org/gall...
http://www.wildflower.org/gall...
http://picasaweb.google.com/ms...
It's somewhere in the family.
