hoary cress USDA PLANTS Symbol: LEDR
U.S. Nativity: Exotic
Habit: Forbs/Herbs
Lepidium draba (L.) Desv

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Taxonomic Rank: Magnoliopsida: Capparales: Brassicaceae
Synonym(s): whitetop, globed-podded hoarycress, peppergrass, whiteweed

Hoary cress, or whitetop, is a perennial forb in the mustard family that can grow up to 2 ft. (0.6 m) tall. The leaves are soft, gray-green, 1.5-3 in. (3.7-7.6 cm) long with fine hairs and heart-shaped bases. The lower leaves tend to have more hairs than the upper leaves. The upper leaves clasp to the stem of the plant. Flowering occurs in early spring to early summer, when white, four-petaled flowers develop in clusters at the apex of the stem. The fruit are heart-shaped seed pods. Hoary cress invades rangelands, pastures, streambanks, and open forests primarily in the western United States, although it does occur in the East. It can form large infestations that can displace native species and reduce grazing quality. Hoary cress is native to Central Europe and Western Asia and was first introduced into the United States in the early 20th century.

Identification, Biology, Control and Management Resources

Selected Images from Invasive.orgView All Images at Invasive.org


Flower(s);
Chris Evans, Illinois Wildlife Action Plan, Bugwood.org
Additional Resolutions & Image Usage

Flower(s);
Steve Dewey, Utah State University, Bugwood.org
Additional Resolutions & Image Usage

Foliage;
Pedro Tenorio-Lezama, , Bugwood.org
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Foliage;
Pedro Tenorio-Lezama, , Bugwood.org
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Flower(s);
Steve Dewey, Utah State University, Bugwood.org
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Plant(s);
Steve Dewey, Utah State University, Bugwood.org
Additional Resolutions & Image Usage

Infestation;
Montana Statewide Noxious Weed Awareness and Education Program Archive, Montana State University, Bugwood.org
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Plant(s); in flower
Chris Evans, Illinois Wildlife Action Plan, Bugwood.org
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Infestation;
Chris Evans, Illinois Wildlife Action Plan, Bugwood.org
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Feature(s); Roots
Steve Dewey, Utah State University, Bugwood.org
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Seed(s);
Steve Hurst, USDA NRCS PLANTS Database, Bugwood.org
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Seed(s); Seeds. Hilum at bottom. FNW taxon.
Julia Scher, USDA APHIS PPQ, Bugwood.org
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EDDMapS Distribution:
This map is incomplete and is based only on current site and county level reports made by experts and records obtained from USDA Plants Database. For more information, visit www.eddmaps.org
 


State(s) Where Reported invasive.
Based on state level agency and organization lists of invasive plants from WeedUS database.


Invasive Listing Sources:
California Invasive Plant Council
Faith Campbell, 1998
Jil M. Swearingen, Survey of invasive plants occurring on National Park Service lands, 2000-2007
John Randall, The Nature Conservancy, Survey of TNC Preserves, 1995.
Pacific Northwest Exotic Pest Plant Council, 1998