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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

Click image to enlarge

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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Fact Sheet: Hoary Cress (Jan 2014; PDF | 983 KB)
Alberta Invasive Plants Council (Canada).


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.


Germplasm Resources Information Network (GRIN) - Lepidium appelianum
USDA. ARS. National Genetic Resources Program.

Hoary Cress Consortium
USDA. ARS. Northern Plains Agricultural Research Laboratory.

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.

Weed Identification Guide - Hoary Cress
Saskatchewan Ministry of Agriculture (Canada).


Encycloweedia: Data Sheet - Lepidium genus
California Department of Food and Agriculture.
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.

Hoary Cress (Whitetop) (PDF | 466 KB)
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: Nov 18, 2015
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