AUSTRIAN FIELDCRESS, Rorippa austriaca (Crantz) Bess. 1, plant in bloom; 2, root and base of plant; 3, flower; 4, seed pod; 5, seed. Perennial, reproducing by rhizomes and occasionally by seeds. Stems erect or ascending, branching at the top, smooth, 1 to 3 feet (30 to 90 cm) tall. Leaves alternate. Upper leaves clasping the stem; lowermost leaves larger, with petioles, and more distinctly toothed than those on upper part of plant. Flowers with 4 small yellow petals, in loose clusters at tips of branches. Seed pods small, nearly spherical or oblong, with a distinct beak at the tip. Seeds small, brown to black, rough or warty, usually do not develop in northern regions. Found rarely in pastures, cropland, and waste areas, but regarded as a troublesome weed because it is very persistent. Spread chiefly by rhizome fragments.