Whitetop

Scientific name: Lepidium draba L. (formerly known as Cardaria draba)

Common names: Whitetop, hoary cress, whiteweed, peppergrass, heart-podded hoarycress, hoary cardaria

Native To: Eurasia

Date of U.S. Introduction: Early 1900s

Images: Invasive.org and Google

Means of Introduction: Accidentally through contaminated seed

Impact: Crowds out native species

Current U.S. Distribution:

• National Agricultural Pest Information System - Pest Tracker - Reported Status
• 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

Cardaria draba (L.) Desv.
Integrated Taxonomic Information System.
Taxonomy

Cardaria draba (L.) Desv. - Noxious and Nuisance Plant Management Information Systems (PMIS)
DOD. USACE. Engineer Research and Development Center. Environmental Laboratory.
Identification/Description; Photographs; Distribution

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

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

Lepidium draba L. subsp. draba - Germplasm Resources Information Network (GRIN)
USDA. ARS. National Genetic Resources Program.
Taxonomy; Distribution; Legal Aspects

Whitetop - Weed of the Week (Oct 9, 2006; PDF | 68 KB)
USDA. FS. Northeastern Area. Forest Health Protection. Identification/Description; Photographs; Introduction History; Impacts; Habitat; Distribution; Controls

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; Dispersion; Controls; Special Note: References

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

Hoary Cress
California Bureau of Land Management. Alturas Field Office.
Identification/Description; Photographs; Habitat; Distribution

Cardaria genus - EncycloWeedia
California Department of Food and Agriculture.
Identification/Description; Introduction History; Impacts; Life Cycle; Habitat; Distribution; Controls; Special Note: References

Whitetop / Hoary Cress - Best Management Practices Weed Profile (PDF | 207 KB)
Colorado State Parks.
Identification/Description; Illustrations; Introduction History; Impacts; Habitat; Distribution; Controls; Special Note: References

Integrated Weed Management of Hoary Cress (Whitetop) (PDF | 329 KB)
State of Colorado. Douglas County. Public Works.
Identification/Description; Photographs; Controls

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

Class C Noxious Weed: Hoary Cress (Written Findings)
Washington State Noxious Weed Control Board.
Identification/Description; Introduction History; Impacts; Life Cycle; Habitat; Controls

Hoary Cress - 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 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 - Information Notes
Victoria Department of Primary Industries (Australia).
Identification/Description; Photographs; Distribution; Dispersion; Controls; Legal Aspects

Hoary Cress - Guide to Weeds in British Columbia (PDF | 159 KB)
British Columbia Ministry of Agriculture Food and Fisheries (Canada).
Identification/Description; Illustrations; Impacts; Life Cycle; Habitat; Distribution; Controls; Legal Aspects

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

Cardaria draba - Invasive Plants of California's Wildlands Book (2000)
California Invasive Plant Council.
Identification/Description; Photographs; Illustrations; Life Cycle; Habitat; Distribution; Dispersion; Controls

Hoary Cress
Santa Margarita and San Luis Rey Watersheds Weed Management Area (California).
Identification/Description; Photographs

Hoary Cress
Colorado Weed Management Association.
Identification/Description; Photographs; Life Cycle; Habitat; Distribution; Dispersion

Cardaria draba (Whitetop)
Montana War on Weeds.
Identification/Description; Photographs; Introduction History; Habitat; Distribution; Controls

Hoary Cress (Whitetop)
Montana Weed Control Association.
Identification/Description; Photographs; Introduction History; Impacts; Life Cycle; Habitat; Distribution; Dispersion; Controls