Council or Task Force
Invasive Plants of California's Wildlands - Cardaria
California Invasive Plant Council.
Bossard, C.C., J.M. Randall, and M.C. Hoshovsky (Editors). 2000. Invasive Plants of California's Wildlands. University of California Press. Berkeley, CA.
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 draba
USDA. APHIS. PPQ. Center for Plant Health Science and Technology; California Department of Food and Agriculture.
Invasive Plant Atlas of the United States - Hoary
University of Georgia. Center for Invasive
Species and Ecosystem Health.
Hoary Cress Consortium
University of Idaho.
Invasive Species Compendium - Lepidium draba
U.S. National Plant Germplasm System - Lepidium draba
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 - Whitetop
USDA. NRCS. National Plant Data Center.
Weeds in Australia -
Hoary Cress (Lepidium draba)
Australian Government. Department of the Environment and Energy.
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.
Noxious Weed Species - Hoary Cress
Colorado Department of Agriculture. Conservation Services Division. Noxious Weed Program.
C Noxious Weed: Hoary
Cress (Written Findings)
Washington State Noxious Weed Control Board.
Hoary Cress Whitetop: Options for Control (PDF | 1.04 MB)
Lincoln County Noxious Weed Control Board (Washington).
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.
Noxious Weed Information - Hoary Cress (B List)
Colorado Weed Management Association.
Species Fact Sheet: Whitetop (2009; PDF | 377 KB)
Learning Center of the American Southwest.
Weed Identification - Hoary Cress (Whitetop)
Montana Weed Control Association.