(Dipsacus fullonum L.)
Photo from Weeds of the West, revised ed.
Growth Habit: Biennial which grows to 6 feet in height.
Leaves: Leaves are conspicuously veined, with stiff prickles on the lower midrib. Stem leaves are lanceolate and are up to 10 inches in length.
Stem: The stem is striate-angled with several rows of downward turned prickles.
Flower: Flowers are purple, borne in dense heads, each flower subtended by spine-like bractlets.
Seeds: Fruits are 4-angled, each with a single seed.
Reproduction: By Seed.
Habitat: Most common in moist sites along irrigation ditches, canals, and disturbed areas.
Herbicides: Glyphosate, 2,4 - D amine