Xanthium strumarium

Family: Asteraceae
Common Name: rough cocklebur
Symbol: XAST
Description: Annuals; 1-10 (20) dm; stems unarmed; leaves deltate to ovate or suborbiculate or palmately lobed, 4-15 (20) cm long, not silvery-sericeous below. Burs 10-30+ mm. Damp or seasonally wet, often alkaline, soils, waste places, margins of agriculture; 10-2000 m.