HARE'S EAR MUSTARD, Conringia
orientalis (L.) Dumort. 1, open seed pod; 2, seed; 3,
entire plant. Annual or winter annual, with taproots,
reproducing by seed. Stem erect, growing from 1 to 3 feet (30 to
90 cm) tall, branching little if at all, becoming stiff and wiry with age.
Leaves smooth, alternate, elliptic in shape, 1 to 3 inches (2.5
to 7.5 cm) long, base clasping the stem with heart-shaped lobes. Flowers
small, pale yellow, 4-petaled. Pods erect, narrow, 2 to 4 inches (5 to
10 cm) long. Seeds dark mahogany, oblong, circular in cross section,
surface roughened with minute shallow pits. Found in small-grain
and legume fields.