WORMSEED MUSTARD, Erysimum cheiranthoides L. 1, plant; 2, flower; 3, seed pod; 4, seed. Annual or winter annual, reproducing by seed. Stem erect, simple or sparingly branched, 1 to 2 feet (30 to 60 cm) tall, green or slightly grayish. Leaves numerous, alternate, lanceolate, tapering to the base, slightly toothed, finely pubescent. Flowers bright yellow, small, 4-petaled. Seed pods somewhat 4-angled, elongate, pedicels spreading at 45° angle from stem. Seeds small, oblong, brownish. Found on moist soils in corn, soybeans, small grains, or noncultivated areas.