spiny plumeless thistle USDA PLANTS Symbol: CAAC
U.S. Nativity: Exotic
Habit: Forbs/Herbs
Carduus acanthoides L.

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Taxonomic Rank: Magnoliopsida: Asterales: Asteraceae
Synonym(s): plumeless thistle
Native Range: Temp. Asia, Europe (GRIN);

Spiny plumeless thistle is an annual or biennial herbaceous plant that grows to 5 ft. (1.5 m) tall. It is an invader of pastures and other disturbed areas throughout parts of the western, central, and northeastern United States, as well as southern Canada. Flowering occurs from May to August. The flower heads are red to purple in color and up to 1 in. (2.5 cm) in diameter. Flower stems are branched with spiny wings extending to the flower heads. Hybridization with musk thistle (C. nutans) has been observed. Spiny plumeless thistle infests open, disturbed areas such as pastures, roadsides, and railroad right-of-ways. It can form dense stands that reduce the forage potential of pastures and suppress the growth of more desirable vegetation. Spiny plumeless thistle is native to Europe and Asia and was first discovered in the United States in Camden, New Jersey in 1878.

Identification, Biology, Control and Management Resources

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


Flower(s);
Gary L. Piper, Washington State University, Bugwood.org
Additional Resolutions & Image Usage

Plant(s);
Gary L. Piper, Washington State University, Bugwood.org
Additional Resolutions & Image Usage

Foliage;
Steve Dewey, Utah State University, Bugwood.org
Additional Resolutions & Image Usage

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

Plant(s); in flower
Todd Pfeiffer, Klamath County Weed Control, Bugwood.org
Additional Resolutions & Image Usage

Flower(s);
Todd Pfeiffer, Klamath County Weed Control, Bugwood.org
Additional Resolutions & Image Usage

Foliage;
Todd Pfeiffer, Klamath County Weed Control, Bugwood.org
Additional Resolutions & Image Usage

Plant(s);
Todd Pfeiffer, Klamath County Weed Control, Bugwood.org
Additional Resolutions & Image Usage

Plant(s);
Todd Pfeiffer, Klamath County Weed Control, 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:
Theodore Roosevelt National Park (North Dakota)
Yellowstone National Park (Wyoming)



Invasive Listing Sources:
California Invasive Plant Council
Faith Campbell, 1998
Hoffman, R. & K. Kearns, Eds. 1997. Wisconsin manual of control recommendations for ecologically invasive plants. Wisconsin Dept. Natural Resources, Bureau of Endangered Resources. Madison, Wisconsin. 102pp.
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.
Mid-Atlantic Exotic Pest Plant Council, 2005
New Jersey Department of Agriculture, Division of Plant Industry, 2004
Pacific Northwest Exotic Pest Plant Council, 1998
Virginia Department of Conservation and Recreation, 2009