Botany Help Needed

Taking time out from the work of sorting through my unfinished business to post this return visitor to my unpaved parking area.  I posted this little guy last year, but no one responded.  I think it's probably a non-native species, but I can't find it in any of my books.  I might have to review my plant anatomy, get out a good hand lens, and dig into the details and an advanced taxonomic key such as in the Jepson manual.  The blossoms are only abut an eighth of an inch in diameter and are easily overlooked in a patch of wild grasses, especially when upstaged by dandelions.  It looks roughly like a phlox, but I was hoping a botanist out there could help me out.  I can't afford the new Jepson manual as yet.