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Hairy Whitetop

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Hairy whitetop
Hairy whitetop, plants in late season in fruit - Photo by Joseph DiTomaso; University of California - Davis
Scientific Name: 

Lepidium appelianum Al-Shehbaz (formerly known as Cardaria pubescens) (ITIS)

Common Name: 

Hairy Whitetop, Hoary Cress, Globe-podded Hoary Cress, Ball Cress, White-top lens, Peppergrass

Native To: 
Date of U.S. Introduction: 

First discovered in 1919 (Mulligan and Findlay 1974)

Means of Introduction: 

Introduced accidentally with contaminated alfalfa seed (Mulligan and Findlay 1974)


Crowds out native species and crops (Zouhar 2004)

Distribution / Maps / Survey Status

University of Georgia. Center for Invasive Species and Ecosystem Health.
Provides state, county, point and GIS data. Maps can be downloaded and shared.


University of California - Berkeley. Digital Library Project.
University of Georgia. Center for Invasive Species and Ecosystem Health.

Selected Resources

The section below contains highly relevant resources for this species, organized by source. Or, to display all related content view all resources for Hairy Whitetop.

Council or Task Force

Alberta Invasive Species Council (Canada).

See also: Fact Sheets for more information about individual invasive species, including those listed as "Prohibited Noxious" and "Noxious" under the Alberta Weed Control Act


USDA. APHIS. PPQ. Center for Plant Health Science and Technology; California Department of Food and Agriculture.

University of Idaho.
University of Georgia. Center for Invasive Species and Ecosystem Health.
Federal Government
USDA. FS. Rocky Mountain Research Station. Fire Sciences Laboratory.
USDA. NRCS. National Plant Data Center.

USDA. ARS. National Genetic Resources Program. GRIN-Global.

State and Local Government
California Department of Food and Agriculture.
See also: Included on California's noxious weed list; see Encycloweedia: Program Details for additional resources