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

Hairy Whitetop

Hairy Whitetop

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

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

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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 Internet Resources:

Federal Government

Lepidium appelianum
Integrated Taxonomic Information System.

Lepidium appelianum Article Citation Search - AGRICOLA Database
USDA. National Agricultural Library.
Research; Special Note: NAL Catalog Search (resources)

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

Hoary Cress Consortium
USDA. ARS. Northern Plains Agricultural Research Laboratory.
Taxonomy; Identification/Description; Photographs; Illustrations; Controls

Cardaria pubescens - Federal Noxious Weed Disseminules of the U.S.
USDA. Animal and Plant Health Inspection Service and California Department of Food and Agriculture.
Identification/Description; Photographs; Impacts; Habitat; Distribution

Cardaria spp. - Fire Effects Information System (FEIS)
USDA. FS. Rocky Mountain Research Station. Fire Sciences Laboratory.
Taxonomy; Identification/Description; Photographs; Introduction History; Impacts; Life Cycle; Habitat; Distribution; Controls; Special Note: References

PLANTS Database - Hairy Whitetop
USDA. NRCS. National Plant Data Center.
Taxonomy; Distribution; Legal Aspects

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State Government

Cardaria genus - EncycloWeedia
California Department of Food and Agriculture.
Identification/Description; Photographs; Habitat; Distribution; Dispersion; Controls

Hairy Whitetop
Oregon Department of Agriculture. Noxious Weed Control Program.
Identification/Description; Photographs; Impacts; Distribution

Hoary Cress and Hairy Whitetop
State of Washington. Stevens County. Noxious Weed Control Board.
Identification/Description; Photographs; Life Cycle; Controls

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Hairy Whitetop - CalPhotos
University of California - Berkeley. Digital Library Project.

Cardaria pubescens (C.A. Mey) Jarm. - Jepson Interchange
University of California - Berkeley. Jepson Herbaria.
Taxonomy; Identification/Description; Distribution; Special Note: Summary of taxonomic name change, County distribution maps (California)

Hairy Whitetop - Invasive Plant Atlas of the United States
University of Georgia. Center for Invasive Species and Ecosystem Health.
Taxonomy; Identification/Description; Photographs; Introduction History; Distribution

Hoary Cress (Whitetop) (PDF | 466 KB)
Montana State University. Extension.
Identification/Description; Photographs; Introduction History; Impacts; Life Cycle; Habitat; Distribution; Dispersion; Controls

Managing Hoary Cress (PDF | 357 KB)
University of Nevada - Reno. Cooperative Extension.
Identification/Description; Photographs; Introduction History; Impacts; Life Cycle; Habitat; Dispersion; Controls

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Invasive Alien Species: Hoary Cress (PDF | 237 KB)
Alberta Invasive Plants Council (Canada).
Identification/Description; Photographs; Habitat; Controls

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Controlling Hoary Cress in the United States
Photographs; Controls; Research

Cardaria pubescens (PDF | 299 KB)
Learning Center of the American Southwest.
Identification/Description; Photographs; Habitat; Distribution


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: Jul 01, 2014
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