Star burr, a member of the asteraceae family, is an annual erect herb to 90 cm high. Stems with multi-celled stiff hairs. Leaves opposite, ovate to elliptic, hairy, leaf margins toothed or lobed to almost entire; leaf stalk absent. Fruiting heads a group of 5–10 ‘seeds’ in a star-like burr, each ‘seed’ wedge-shaped, 4–7 mm long, hairless.