Photo from Weeds of the West, revised edition.
Growth Habit: Perennial, 1 to 3 feet in height
Leaves: Leaves are lanceolate, bright green to gray-green, entire toothed, basal leaves larger than upper leaves, inflorescence a raceme.
Stem: 1 to 3 feet in height
Flower: Flowers are white, in dense clusters near ends of branches, very small
Roots: Deep-seated rootstocks and creeping rhizomes, very difficult to control.
Seeds: 2 seeds per fruit, fruit is a silicle, rounded, flattened, slightly hairy, about 1/16 inch long, and reddish-brown.
Reproduction: By seed and creeping rhizomes.
Habitat: Grows in waste areas, wet areas, ditches, roadsides, and cropland.
Herbicides: 2,4 - D amine, Escort, Telar