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National Park Service
U.S. Department of the Interior

NPSpecies - Park Species Profile


Amaranthus retroflexus
Pigweed
Florissant Fossil Beds National Monument
			Record Status: Approved
Occurrence:	Present
Nativeness:	Non-native
Abundance:	Unknown

Scientific Name with Authority:		Amaranthus retroflexus L.
Park Preferred Common Name(s):		Pigweed
Park Synonyms:

Taxonomic Hierarchy:		Kingdom Plantae, Phylum Tracheophyta, Subphylum Spermatophytina, Order Caryophyllales, Family Amaranthaceae, Genus Amaranthus, Species Amaranthus retroflexus


Park Tags:
ParkTag -


Threatened/Endangered Status:
State Species of Concern Status:
Ozone-sensitive Status:
NatureServe Global Rank:		G5
NatureServe State Rank:		CO: SNA
Evidence:		0 Observations, 1 Vouchers, 2 Data Store References, 0 External Links


Other Parks Where Species is Listed:
Acadia National Park	Agate Fossil Beds National Monument
Anacostia Park	Apostle Islands National Lakeshore
Arches National Park	Badlands National Park
Bandelier National Monument	Bent's Old Fort National Historic Site
Big Bend National Park	Bighorn Canyon National Recreation Area
Boston Harbor Islands National Recreation Area	Buffalo National River
Canyon De Chelly National Monument	Canyonlands National Park
Capitol Reef National Park	Carlsbad Caverns National Park
Chamizal National Memorial	Chickasaw National Recreation Area
City Of Rocks National Reserve	Craters of the Moon National Monument and Preserve
Curecanti National Recreation Area	Cuyahoga Valley National Park
Delaware Water Gap National Recreation Area	Devils Tower National Monument
Effigy Mounds National Monument	Eugene O'Neill National Historic Site
Fire Island National Seashore	First State National Historical Park
Fort Laramie National Historic Site	Fort Larned National Historic Site
Fort Union Trading Post National Historic Site	Gateway National Recreation Area
George Washington Birthplace National Monument	George Washington Carver National Monument
George Washington Memorial Parkway	Glacier National Park
Glen Canyon National Recreation Area	Grand Canyon National Park
Grand Teton National Park	Grant-Kohrs Ranch National Historic Site
Great Sand Dunes National Park and Preserve	Great Smoky Mountains National Park
Guadalupe Mountains National Park	Hagerman Fossil Beds National Monument
Harpers Ferry National Historical Park	Homestead National Historical Park
Hopewell Culture National Historical Park	Hopewell Furnace National Historic Site
Hovenweep National Monument	Indiana Dunes National Park
Jewel Cave National Monument	John Muir National Historic Site
Knife River Indian Villages National Historic Site	Lake Clark National Park and Preserve
Lake Meredith National Recreation Area	Lake Roosevelt National Recreation Area
Lava Beds National Monument	Mammoth Cave National Park
Marsh-Billings-Rockefeller National Historical Park	Martin Van Buren National Historic Site
Mesa Verde National Park	Minute Man National Historical Park
Missouri National Recreational River	Monocacy National Battlefield
Natural Bridges National Monument	Navajo National Monument
Nez Perce National Historical Park	North Cascades National Park
Ozark National Scenic Riverways	Petrified Forest National Park
Pinnacles National Park	Pipe Spring National Monument
Pipestone National Monument	Rocky Mountain National Park
Russell Cave National Monument	Sagamore Hill National Historic Site
Saint Croix National Scenic Riverway	Salinas Pueblo Missions National Monument
Santa Monica Mountains National Recreation Area	Saratoga National Historical Park
Scotts Bluff National Monument	Sequoia and Kings Canyon National Parks
Sleeping Bear Dunes National Lakeshore	Sunset Crater Volcano National Monument
Tallgrass Prairie National Preserve	Theodore Roosevelt National Park
Timpanogos Cave National Monument	Upper Delaware Scenic and Recreational River
Valles Caldera National Preserve	Voyageurs National Park
Walnut Canyon National Monument	White Sands National Park
Whitman Mission National Historic Site	Wind Cave National Park
Yellowstone National Park	Yucca House National Monument
Zion National Park


Last Modified Date:	8/14/2008

NPSpecies - The National Park Service biodiversity database. IRMA Portal version.https://irma.nps.gov/npspecies. Accessed 10/8/2025 5:51:08 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	10/8/2025 5:51:08 PM

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