U.S. DEPARTMENT OF THE INTERIORBUREAU OF LAND MANAGEMENT
California |
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Arcata Field Office | ||
Bull Thistle (Cirsium vulgare)Sunflower Family (Asteraceae) California Department of Food and Agriculture Botany Lab
Description: This biennial stands 1 to 6 feet (3 to 20 decimeters) tall. It generally has one stem that is openly branched above the middle and is often glanular and hairy. Leaves are harshly bristly above, sometimes with densely interwoven hairs. Lower leaves are 4 to 16 inches (10 to 40 cm) long and upper leaves become smaller with spiny wings. Main leaf lobes generally rigidly spreading, spine-margined, with main spines < .5 inches (1.5 cm) long. Blooms are one to several flowers and clustered with bract-like uppermost leaves beneath. Flower heads are 1 to 2 inches (2 to 4 cm) in diameter, hemispheric or bell-shaped, and petals are purple. |
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