PINEAPPLEWEED, Matricaria matricarioides (Less.) Porter. 1, entire plant; 2, flower head; 3, seed. Annual. Stems smooth, without hairs, much-branched, 6 to 18 inches (15 to 45 cm) tall. Leaves alternate, finely divided, smelling like pineapple when bruised. Flower heads numerous, on the ends of branches, without ray flowers, consisting of a mass of greenish-yellow disk flowers grouped into a cone-shaped head about 1/4 inch (6 mm) in diameter. Seeds about 1/16 inch (1.5 mm) long, 3- to 5-ribbed. Found on roadsides and in barnyards, waste places, gardens, and sometimes cultivated fields.