Plant Form: Annual herb.
Size: To 1.2 m tall.
Stem: Not spiny, with bristly hairs.
Leaves: Mostly heart-shaped to triangular in outline, weakly lobed, irregularly toothed, up to 18 cm long-stalked, with bristly hairs.
Flowers: Inconspicuous, clustered, whitish to greenish flowerheads.
Fruit and Seeds: Burrs 7-20 mm long, not hairy, with many hooked spines on surface and two equally long, straight beaks at the end.
Habitat: Farmland, roadsides, wastelands, and riverbanks.
Distinguishing Features: Differs from Xanthium spinosum in not having spines on the stem. Is sometimes considered to include X. occidentale.
Impacts: Outcompetes and replaces native vegetation, burrs contaminate wool, pollen may cause hayfever symptoms.