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National Park Service
U.S. Department of the Interior

NPSpecies - Park Species Profile


Conyza canadensis
Canada horseweed, Canadian horseweed, horseweed, horseweed fleabane, mares tail, marestail
George Washington Memorial Parkway
			Record Status: Approved
Occurrence:	Probably Present
Nativeness:	Native
Abundance:

Scientific Name with Authority:		Conyza canadensis (L.) Cronquist
Park Preferred Common Name(s):
Park Synonyms:		Erigeron canadensis

Taxonomic Hierarchy:		Kingdom Plantae, Phylum Tracheophyta, Subphylum Spermatophytina, Order Asterales, Family Asteraceae, Genus Conyza, Species Conyza canadensis


Park Tags:
ParkTag -


Threatened/Endangered Status:
State Species of Concern Status:
Ozone-sensitive Status:
NatureServe Global Rank:		G5
NatureServe State Rank:		DC: SNR; MD: SNR; VA: S5
Evidence:		3 Observations, 0 Vouchers, 1 Data Store References, 0 External Links


Other Parks Where Species is Listed:
Abraham Lincoln Birthplace National Historical Park	Acadia National Park
Agate Fossil Beds National Monument	Amistad National Recreation Area
Antietam National Battlefield	Apostle Islands National Lakeshore
Appalachian National Scenic Trail	Aztec Ruins National Monument
Badlands National Park	Bent's Old Fort National Historic Site
Big Bend National Park	Big South Fork National River and Recreation Area
Big Thicket National Preserve	Bighorn Canyon National Recreation Area
Black Canyon of the Gunnison National Park	Boston Harbor Islands National Recreation Area
Buffalo National River	Cabrillo National Monument
Canaveral National Seashore	Canyon De Chelly National Monument
Cape Hatteras National Seashore	Cape Lookout National Seashore
Capulin Volcano National Monument	Carl Sandburg Home National Historic Site
Carlsbad Caverns National Park	Casa Grande Ruins National Monument
Chaco Culture National Historical Park	Channel Islands National Park
Charles Pinckney National Historic Site	Chattahoochee River National Recreation Area
Chickamauga and Chattanooga National Military Park	Chickasaw National Recreation Area
Chiricahua National Monument	City Of Rocks National Reserve
Colonial National Historical Park	Colorado National Monument
Coronado National Memorial	Cowpens National Battlefield
Crater Lake National Park	Cumberland Gap National Historical Park
Curecanti National Recreation Area	Cuyahoga Valley National Park
Delaware Water Gap National Recreation Area	Devils Tower National Monument
Ebey's Landing National Historical Reserve	Effigy Mounds National Monument
El Malpais National Monument	El Morro National Monument
Fire Island National Seashore	First State National Historical Park
Fort Bowie National Historic Site	Fort Caroline National Memorial
Fort Donelson National Battlefield	Fort Frederica National Monument
Fort Laramie National Historic Site	Fort Larned National Historic Site
Fort Point National Historic Site	Fort Pulaski National Monument
Fort Sumter National Historical Park	Fort Union National Monument
Fort Union Trading Post National Historic Site	Fort Vancouver National Historic Site
Gateway National Recreation Area	George Washington Birthplace National Monument
George Washington Carver National Monument	Gettysburg National Military Park
Gila Cliff Dwellings National Monument	Glacier National Park
Grand Canyon National Park	Grand Portage National Monument
Grand Teton National Park	Great Falls Park
Great Sand Dunes National Park and Preserve	Great Smoky Mountains National Park
Guadalupe Mountains National Park	Guilford Courthouse National Military Park
Gulf Islands National Seashore	Herbert Hoover National Historic Site
Homestead National Historical Park	Hopewell Culture National Historical Park
Hopewell Furnace National Historic Site	Hot Springs National Park
Hubbell Trading Post National Historic Site	Indiana Dunes National Park
Isle Royale National Park	Jewel Cave National Monument
John Day Fossil Beds National Monument	John Muir National Historic Site
Johnstown Flood National Memorial	Joshua Tree National Park
Kalaupapa National Historical Park	Kenilworth Park and Aquatic Gardens
Kennesaw Mountain National Battlefield Park	Knife River Indian Villages National Historic Site
Lake Mead National Recreation Area	Lake Roosevelt National Recreation Area
Little River Canyon National Preserve	Lyndon B. Johnson National Historical Park
Mammoth Cave National Park	Manassas National Battlefield Park
Martin Van Buren National Historic Site	Mesa Verde National Park
Minute Man National Historical Park	Mississippi National River and Recreation Areas
Missouri National Recreational River	Mojave National Preserve
Monocacy National Battlefield	Montezuma Castle National Monument
Morristown National Historical Park	Mount Rainier National Park
Mount Rushmore National Memorial	Navajo National Monument
New River Gorge National Park and Preserve	Nez Perce National Historical Park
North Cascades National Park	Obed Wild and Scenic River
Oregon Caves National Monument	Organ Pipe Cactus National Monument
Ozark National Scenic Riverways	Padre Island National Seashore
Pea Ridge National Military Park	Pecos National Historical Park
Petersburg National Battlefield	Petrified Forest National Park
Petroglyph National Monument	Pictured Rocks National Lakeshore
Pipestone National Monument	Presidio of San Francisco
Prince William Forest Park	Rainbow Bridge National Monument
Richmond National Battlefield Park	Rock Creek Park
Rocky Mountain National Park	Sagamore Hill National Historic Site
Saguaro National Park	Saint Croix National Scenic Riverway
San Antonio Missions National Historical Park	Saratoga National Historical Park
Scotts Bluff National Monument	Sequoia and Kings Canyon National Parks
Shiloh National Military Park	Sleeping Bear Dunes National Lakeshore
Stones River National Battlefield	Suitland Parkway
Tallgrass Prairie National Preserve	Theodore Roosevelt National Park
Thomas Stone National Historic Site	Timucuan Ecological and Historic Preserve
Tonto National Monument	Tumacacori National Historical Park
Tuzigoot National Monument	Valley Forge National Historical Park
Voyageurs National Park	Walnut Canyon National Monument
War in the Pacific National Historical Park	Washita Battlefield National Historic Site
White Sands National Park	Whitman Mission National Historic Site
Wilson's Creek National Battlefield	Wind Cave National Park
Wolf Trap National Park for the Performing Arts	Yellowstone National Park
Yosemite National Park	Yucca House National Monument


Last Modified Date:	10/26/2015

NPSpecies - The National Park Service biodiversity database. IRMA Portal version.https://irma.nps.gov/npspecies. Accessed 10/1/2025 5:08:00 PM

NatureServe Global Rank and State Rank

NatureServe. 2017. NatureServe Web Service. Arlington, VA. U.S.A. Available http://services.natureserve.org. Accessed: 12/4/2017. Updated quarterly.

This information is provided by NatureServe (www.natureserve.org) and its network of natural heritage member programs, a leading source of information about rare and endangered species, and threatened ecosystems.


Species Profile	Page 1 of 1	10/1/2025 5:08:00 PM

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