We spent this fine morning trying to reduce Italian thistle.
at Nimbus Fish Hatchery
Perhaps Italian thistle? It was growing upland of a riparian zone
Carduus pycnocephalus, with common names including Italian thistle, Italian plumeless thistle, and Plymouth thistle, is a species of thistle. It is native to: the Mediterranean region in southern Europe, North Africa, and Western Asia; East Europe and the Caucasus; and the Indian Subcontinent.