Description
Medium to tall, robust, rough, somewhat bristly perennial, to 1.5m; stems erect, branched above. Leaves pinnately-lobed, occasionally unlobed, with oblong or linear segments, lower leaves stalked. Flower heads purple, large, 30-50mm, the outer florets much longer than the inner; flower-bracts green with brown or black, fringed horse-shoe shaped appendage.