We are doing a Biology project and need some help. This plant has a very dark green/purple stem. It has some feather white poofs that are probably left over from where the flower would have been. It also have pointed green leaves. This was taken in West Tennessee in mid October. Any help is appreciated.
Maybe Prunella vulgaris http://plants.usda.gov/java/profile?symbol=PRVU
For future reference, I just google usda + plant and go into the usda plant database and on the left side click on advanced search and select county, bloom colour, family, etc.