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

Native To: Eurasia (Mulligan and Findlay 1974)

Date of U.S. Introduction: First discovered in 1919 (Mulligan and Findlay 1974)

Images: Invasive.org and Google

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:

• PLANTS Database map (see complete PLANTS Profile for county distribution and native status)
• Early Detection & Distribution Mapping System

U.S. States and U.S. National Parks Where Reported Invasive: Invasive Plant Atlas of the United States map

Management Plans: Plants

Selected Internet Resources:

• Federal Government
• State Government
• University/Academic
• International
• Organizations

Lepidium appelianum
Integrated Taxonomic Information System.
Taxonomy

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

Plant profile for Cardaria pubescens - PLANTS Database
USDA. NRCS. National Plant Data Center.
Taxonomy; Distribution; Legal Aspects

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

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

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

International

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

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

Hairy Whitetop
Eastern Forest Environmental Threat Assessment Center.
Identification/Description; Photographs; Introduction History; Life Cycle; Distribution

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

Citations

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.