MARSHELDER, Iva xanthifolia Nutt. 1, plant in bloom; 2, root; 3, seeds; 4, flowers. Annual with taproot, reproducing by seeds. Stem 3 to 8 feet (0.9 to 2.4 m) tall, moderately branched, grayish-green, smooth. Leaves broad, mostly opposite, light grayish-green, covered with small short hairs, with toothed margins. Flower heads small, drooping, borne in panicles at top of stem and in axils of upper leaves. Flowers either male or female but borne in the same head, without petals, greenish-yellow in color. Seeds gray to black, triangular, somewhat flattened with a ridged surface, about 1/8 inch (3 mm) long, produced in abundance. Found along roadsides, in farmyards, ditches, and pastures. Infrequent in cultivated fields.