If you venture into the woods or along a wooded trail over the Memorial Day weekend, you will have a good chance of spotting the blue-violet or reddish-purple flowers on this native plant. Sweet William usually begins blooming in April, but I didn’t see any flowers this year until May. Also known as wild blue phlox or woodland phlox, this species is native to most of North America east of the Rocky Mountains.
What appear to be five petals on each flower are actually lobes. I believe all of the enclosed photographs show the subspecies Phlox divaricata laphamii, which “has a more western range,” according to the Illinois Wildflowers website. A subspecies called Phlox divaricata divaricata has lobes with notched tips and is generally found in Indiana or to the east.