JIMSONWEED, Datura stramonium L. 1, upper portion of plant; 2, flower; 3, seed pod; 4, seed. Annual, reproducing by seed. Roots thick, shallow, extensively branched. Stems smooth, thick, erect, branching widely in upper part, 2 to 4 feet (0.6 to 1.2 m) tall. Leaves alternate, large, coarse, smooth, ovate, with irregularly toothed edges and a distinctive rank odor. Flowers large, funnel-shaped, white to pinkish, 2 to 5 inches (5 to 12.5 cm) long, borne singly on short stalks in the axils of the branches. Seed pod about 1 inch (2.5 cm) in diameter, egg-shaped, covered with short, sharp spines. Seed dark brown to black, kidney-shaped, flattened, surface irregular and pitted. Found in cultivated crops on rich land and especially in old feedlots. This plant contains poisonous materials.