Thanks to Alert Flowerspotter Aaron who snapped this for me while at an autocross event with his brother in Ayers, Massachusetts. Growing through the concrete at an old airfield. Considered a noxious weed in many western states. One of its invasive species skills is: “low palatability” —meaning no one wants to eat it AND it’s “allelopathic”, meaning its roots send out a toxin that stunts the growth of nearby plants! Wily! Native to Europe.
Spotted Knapweed (Centaurea maculosa)