Red Campion (Lychnis dioica) presents another problem. According to both the Newcomb's and Peterson's books its scientific name is Lychnis dioica. Yet is difficult to find any information on that name.
Compounding the identification problem for Campions is that lately various species have been reclassified from Silene to Lychnis.
On this website I have chosen for simplicity to take the approach seen in both Peterson's and Newcomb's field guides, for better or worse. It may not be 100% accurate in current scientific terms, but it will do for now.