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You are here: Home / Plants / Species Profiles / Hairy Whitetop
Species Profiles
Hairy whitetop

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

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

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Selected Resources

Native To: Eurasia (Mulligan and Findlay 1974)

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)

Impact: Crowds out native species and crops (Zouhar 2004)

Current U.S. Distribution:


Selected Resources:

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Council or Task Force

Fact Sheet: Hoary Cress (Jan 2014; PDF | 983 KB)
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


Federal Noxious Weed Disseminules of the U.S. - Fact Sheet: Cardaria pubescens
USDA. APHIS. PPQ. Center for Plant Health Science and Technology; California Department of Food and Agriculture.

Invasive Plant Atlas of the United States - Hairy Whitetop
University of Georgia. Center for Invasive Species and Ecosystem Health.

Hoary Cress Consortium
University of Idaho.

Federal Government

U.S. National Plant Germplasm System - Lepidium appelianum
USDA. ARS. National Genetic Resources Program. GRIN-Global.

Fire Effects Information System (FEIS) - Cardaria spp.
USDA. FS. Rocky Mountain Research Station. Fire Sciences Laboratory.

PLANTS Database - Hairy Whitetop
USDA. NRCS. National Plant Data Center.

State Government

Encycloweedia: Data Sheet - Lepidium genus
California Department of Food and Agriculture.
See also: Included on California's noxious weed list; see Encycloweedia: Program Details for additional resources


Weed Control in Natural Areas in the Western United States: Hoary Cress (Whitetop), Lens-Podded and Hairy Whitetop (2013; PDF | 252 KB)
University of California. Weed Research and Information Center.
See also: Weeds in Natural Areas for more information sheets

Biology, Ecology, and Management of Whitetop (Cardaria spp.) (2011)
Montana State University Extension.


Integrated Taxonomic Information System. Lepidium appelianum. [Accessed Sep 10, 2014].

Mulligan, G.A. and J.N. Findlay. 1974. The biology of Canadian weeds. 3. Cardaria draba, C. chalepensis, and C. pubescens. Canadian Journal of Plant Science 54(1):149-160.

Zouhar, K. 2004. Cardaria spp. In: Fire Effects Information System. U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Fire Sciences Laboratory.

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Last Modified: Sep 15, 2018
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