BIGROOT MORNINGGLORY, Ipomoea pandurata (L.) G. F. W. Mey. 1, portion of root; 2, portion of vine with flowers; 3, seed pod; 4, seed. Perennial, reproducing by seed and from roots. Roots yellowish white, enlarging greatly so that they may weigh many pounds, buried in the soil below the plow line. Stems trailing or twining on plants, 2 to 10 feet (0.6 to 3 m) long, smooth, often purplish. Leaves alternate, heart-shaped, 2 to 6 inches (5 to 15 cm) long, smooth, with long petioles. Flowers funnel shaped, 2 to 3 inches (5 to 7.5 cm) in diameter, white with dark purple center. Seed pod egg-shaped, enclosed by several leaflike sepals, containing 2 to 4 seeds. Seeds dark brown, fringed with soft hairs. Found in cultivated fields, along fences and roadsides, especially on sandy soils. Most troublesome in corn, soybeans, and small grain crops. Also commonly known as wild sweet potato.