Perennial pepperweed (Lepidium latifolium)

Perennial pepperweed (Lepidium latifolium)
Image courtesy Rich Old
Perennial pepperweed (Lepidium latifolium)
Image courtesy Dan Sharratt
Perennial pepperweed (Lepidium latifolium)
Image courtesy Tim Butler
EDRR Species?: 

Other common names
Tall white top

Perennial, blooms May to September. Grows 1 to 6 feet tall. Basal leaves are larger than upper leaves, lanceolate, and bright-green to gray-green. Flowers are white, very small, and form dense clusters near the ends of branches. Flowers produce a distinctive odor. Seed are very small, flattened, slightly hairy and reddish brown.

Perennial pepperweed establishes and colonizes rapidly. It degrades nesting habitat for wildlife and displaces desirable species in natural areas and hay meadows. It lowers digestability and protien content of hay and inhibits grazing. Infestations can be so damaging that they significantly affect cropland values. This weed can be found in disturbed areas or bare soil, such as agricultural land, rangeland, graded roadside ditches and irrigation ditches. The weed survives in a wide range of environmental habitats and soil types.