Beefsteak Plant, an introduced species, has been added to the USWildflowers database (05/09/2013.) Scientific name is Perilla fructescens.  It  is also known by the common names Beefsteak Mint and Perilla Mint.  Photo below was taken in Grundy County, TN on Sep 17, 2011.   Go to the Beefsteak Plant detail page for more photos and information.

Beefsteak Plant – Perilla frutescens