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perennial pepperweed (Lepidium latifolium)
ODA rating: B and T
 
USDA Symbol: LELA2
Oregon perennial pepperweed distribution
 
Other common names
Tall white top
 
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Image courtesy of Rich Old, XID services
 
Images courtesy of Tim Butler, Oregon Dept. Agriculture

Image courtesy of Dan Sharratt, Oregon Dept. of Agriculture
 
If images are downloaded and used from the ODA web site please be sure to credit the photographer.
 
 
Description
Perennial; blooms May to September. Grows 1 to 6 ft tall. Basal leaves larger than upper leaves, lanceolate, bright green to gray green, entire to toothed. Flowers white, very small, and form dense clusters near the ends of branches; flowers produce a distinctive odor. Seed very small, flattened, slightly hairy, and reddish brown,
 
Impacts
Perennial pepperweed establishes and colonizes rapidly. It degrades nesting habitat for wildlife and displaces desirable species in natral areas and hay meadows. It lowers digestability and protien content of hay and inhibits grazing. Infestation can be so damaging that they significant;y affect crop land values.  This weed can be found in distrubed 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.
 
Introduction
Native to southern Europe and western Asia but now widely distributed in the U.S. Introduction in the U.S. is thought to be in sugar beet seed in the 1930s.
 
Distribution in Oregon

 
Biological controls
No approved biocontrol agent is available.