horseweed USDA PLANTS Symbol: COCA5
U.S. Nativity: Native
Habit: Forbs/Herbs
Conyza canadensis (L.) Cronq.

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Taxonomic Rank: Magnoliopsida: Asterales: Asteraceae
Synonym(s): Canadian horseweed, Canada horseweed, horseweed, horseweed fleabane, mare's tail, marestail
Native Range: U.S. - Northeast, Northcent., Northwest, Southeast, Southcent., Southwest, Canada, Mexico, So. Amer. (GRIN); Central America (); North America. Not Found (BAIL)

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


Plant(s); June. Photo from Forest Plants of the Southeast and Their Wildlife Uses by J.H. Miller and K.V. Miller, published by The University of Georgia Press in cooperation with the Southern Weed Science Society.
James H. Miller & Ted Bodner, Southern Weed Science Society, Bugwood.org
Additional Resolutions & Image Usage

Plant(s); May. Photo from Forest Plants of the Southeast and Their Wildlife Uses by J.H. Miller and K.V. Miller, published by The University of Georgia Press in cooperation with the Southern Weed Science Society.
James H. Miller & Ted Bodner, Southern Weed Science Society, Bugwood.org
Additional Resolutions & Image Usage

Foliage; rosettes
Joseph M. DiTomaso, University of California - Davis, Bugwood.org
Additional Resolutions & Image Usage

Foliage;
Mary Ellen (Mel) Harte, , Bugwood.org
Additional Resolutions & Image Usage

Foliage;
Bruce Ackley, The Ohio State University, Bugwood.org
Additional Resolutions & Image Usage

Flower(s);
Charles T. Bryson, USDA Agricultural Research Service, Bugwood.org
Additional Resolutions & Image Usage

Flower(s);
Mary Ellen (Mel) Harte, , Bugwood.org
Additional Resolutions & Image Usage

Flower(s);
Mary Ellen (Mel) Harte, , Bugwood.org
Additional Resolutions & Image Usage

Seed(s);
Bruce Ackley, The Ohio State University, Bugwood.org
Additional Resolutions & Image Usage

Seedling(s); close up of cotyledons
Ohio State Weed Lab Archive, The Ohio State University, Bugwood.org
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Plant(s);
Charles T. Bryson, USDA Agricultural Research Service, Bugwood.org
Additional Resolutions & Image Usage

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.

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U.S. National Parks where reported invasive:
Grand Canyon National Park (Arizona)
Haleakala National Park (Hawaii)
Manassas National Battlefield Park (Virginia)



Invasive Listing Sources:
Jil M. Swearingen, Survey of invasive plants occurring on National Park Service lands, 2000-2007