Weedy native plant in the mustard family. Young plants produce a basal rosette of deeply lobed leaves. As plants mature, new leaves are toothed and have a long, narrow shape. The growth habit is upright to 2 ft with a highly branched stem. Flowers and fruit are typical of the mustard family and form on stem ends. Flowers are tiny with four white petals that start in a cluster atop stems and continue to form through the growing season as the stem extends, giving a bottlebrush appearance. Flowers mature to rounded, flattened, slightly notched seed pods along stems.