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

Date of U.S. Introduction: Late 1800s

Images: Invasive.org and Google

Means of Introduction: Introduced accidentally through contaminated seed or ballast water

Impact: Crowds out native species

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: WeedUS Database map

Management Plans: Plants

Selected Internet Resources:

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

Cardaria pubescens
Integrated Taxonomic Information System.
Taxonomy

Cardaria spp. (Whitetop) - Noxious and Nuisance Plant Management Information System (PMIS)
United States Army Corps of Engineers. Engineer Research and Development Center. Environmental Laboratory.
Identification/Description; Photographs; Introduction History; Impacts; Distribution

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

Hoary Cress - Noxious Weed
USDA. Sawtooth National Forest.
Identification/Description; Photographs; Controls

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

Hoary Cress (Whitetop) (Cardaria draba)
State of Colorado. Larimer County. Weed Control District.
Identification/Description; Photographs; Controls

Hoary Cress - Idaho's Noxious Weeds
Idaho Association of Soil Conservation Districts. Idaho OnePlan.
Identification/Description; Photographs; Introduction History; Distribution; Controls

Hoary Cress (Whitetop)
State of Utah. Weber County. Weed Abatement.
Identification/Description; Photographs; Habitat; Dispersion; Controls

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

Hoary Cress - An Illustrated Guide to Arizona Weeds
University of Arizona Press.
Identification/Description; Illustrations; Distribution

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)

Hoary Cress - WeedUS Database
University of Georgia. Center for Invasive Species and Ecosystem Health.
Taxonomy; Identification/Description; Photographs; Introduction History; Distribution

Hoary Cress Wanted Poster--Dead, Not Alive! (PDF | 172 KB)
University of Nevada - Reno. Cooperative Extension.
Identification/Description; Photographs

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

Hoary Cress - Guide to Weeds in British Columbia
British Columbia Ministry of Agriculture Food and Fisheries (Canada).
Identification/Description; Photographs; Illustrations; Impacts; Life Cycle; Habitat; Distribution; Dispersion; Controls

Hoary Cress
Saskatchewan Agriculture, Food and Rural Revitalization (Canada).
Identification/Description; Controls

Biological Control of Whitetops, Lepidium draba and L. appelianum
CABI Bioscience.
Photographs; Controls; Research

Cardaria pubescens (Globe-podded hoary cress)
Nature Conservancy. Global Invasive Species Initiative.
Identification/Description; Photographs; Impacts; Life Cycle; Habitat; Distribution; Dispersion; Controls; Special Note: Element Stewardship Abstract with excellent set of references