Cirsium altissimum

A tall thistle...

A pseudanthium in Morgan-Monroe State Forest north of Bloomington, 8/30/03.

A pseudanthium in Morgan-Monroe State Forest, 8/30/03.

Adaxial view of a cauline leaf in Morgan-Monroe State Forest, 8/30/03.

Abaxial view of a cauline leaf in Morgan-Monroe State Forest, 8/30/03.