Hi Zach -
Your third pic really has me stumped. I looked at pictures of skullcap, but it didn't seem like a match to me.
Your plant looks like a cross between a plantain and a mint! The base looks like plantain, because the plant seems to only have leaves there. The stems piercing rings of purple flowers looks (kinda) like some mint stalks. The closest pic I could find on Google images to yours is a flower stalk of "field mint," but when searching further, they have leaves on the flower stalks, too.
Is it true that the stems have no leaves: just these rings of flowers? (That's what it looks like from your pic).
And are the leaves at the base in a "rosette:" that is -- all radiating from a central point?
Thanks for the challenge!
Mariamne