U.S. DEPARTMENT OF THE INTERIORBUREAU OF LAND MANAGEMENT
|Surprise Field Office|
Bull Thistle (Cirsium vulgare)
Description: A biennial with a short, fleshy taproot. The stem is 1 to 6 feet tall, widely spreading and spiny winged. Leaves sparsely and prickly hairy above, cottony below with spines on margins. Lower leaves to 16 inches long. Flowers terminal, solitary to more or less clustered, 1-1/2 to 2 inches wide and dark purple. Phyllaries narrow and spine tipped. Seeds straw colored, 1/8 inch long, striped lengthwise with brown or black, with a protrusion at one end, and tipped with plume-like hairs.