Date Photo Taken: 06/20/2014
Location: Columbia, MO
Posted By: Brennus
I found this growing not far from the penstemon cobaea. I should have taken a close-up of the leaves: They have an intricate network of fine veins with one vein running around the perimeter of the leaf about 1/8 in. from the edge.
The top of this particular plant may have been damaged by herbivory. There was one other in the vicinity with the top completely gone.