In the mint family?

I found this plant on a town owned parcel that has a plethera of invasives. It has a square stem (maybe not obvious in the picture). Any ideas of what this plant is?

 

Motherwort (Leonurus cardiaca)?

http://waddell.ci.manchester.ct.us/id_motherwort.html

HTH
Chris

 

I read somewhere that plants in the mint family have square stems. Does anyone know if that is true? Marric

 

That's right. Most mints have square stems and opposite leaves.

 

Thanks for the info. Marric