FIELD BINDWEED, Convolvulus arvensis L. 1, plant in flower; 2, seed pod, entire and in cross section; 3, seed; 4, variations in leaf shape. Perennial, reproducing by seeds and rootstocks. Root system extensive; may go down 20 to 30 feet (6 to 9 m). Stems smooth, slender, 2 to 7 feet (0.6 to 2 m) long, twining or spreading over surface of ground. Leaves ovate with spreading basal lobes. Flowers white or pink, funnel-shaped, about 1 inch (2.5 cm) across, usually borne singly in the axils of leaves. Flower stalk has 2 bracts 1/2 to 2 inches (1.3 to 5 cm) below the flower, which distinguish this weed from hedge bindweed. Seed pod egg-shaped, usually containing 4 seeds. Seeds dark brownish-gray, roughened, about 1/8 inch (3 mm) long, with 1 rounded and 2 flattened sides. Found in and able to persist and spread in all noncultivated areas and under most cropping systems. One of the most troublesome weeds in the region. Also known as creeping jenny.