Life (root) » Plantae (plants) » Tracheophyta (Vascular Plants) » Angiospermae (Flowering Plants) » Magnoliopsida (Dicots) » Asterales (asters, bellflowers, fanflowers, and allies) » Asteraceae (sunflowers, daisies, asters, and allies) » Carduoideae (Thistles and Allies) » Cardueae » Carduinae (Thistles and Burdocks) » Silybum » Silybum marianum (milk thistle)