Prunella vulgaris
Herbaceous wetland
My book says it is called either Selfheal or Healall and used to be used medicinally for sore throats and other minor ailments. Actually a perennial of European origin. From the mint family.
You're right Matt, it's Heal All. I've spotted it too.
http://www.projectnoah.org/spottings/690...
Lat: 41.68, Long: -93.29
Spotted on Aug 5, 2011
Submitted on Aug 5, 2011