Home/Species/ Great Ragweed

Ambrosia trifida

Great Ragweed

G5Secure Found in 28 roadless areas NatureServe Explorer →

G5SecureGlobal Rank

Identity

Unique IDELEMENT_GLOBAL.2.129141

Element CodePDAST0C0Q0

Record TypeSPECIES

ClassificationSpecies

Classification StatusStandard

Name CategoryVascular Plant

Endemicoccurs (regularly, as a native taxon) in multiple nations

KingdomPlantae

PhylumAnthophyta

ClassDicotyledoneae

OrderAsterales

FamilyAsteraceae

GenusAmbrosia

Other Common Names

Grande herbe à poux (FR) great ragweed (EN)

Concept Reference

Kartesz, J.T. 1994. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland. 2nd edition. 2 vols. Timber Press, Portland, OR.

Taxonomic Comments

FNA (vol. 21, 2006) does not recognize distinct varieties in Ambrosia trifida, however, according to Weakley et al. (2023), "The distinction between var. trifida and var. texana (or at the specific rank A. trifida and A. aptera) warrants additional study."

Conservation Status

Rank MethodExpertise without calculation

Review Date2016-01-15

Change Date1984-02-09

Ecology & Habitat

Other Nations (2)

CanadaN5

Province	Rank	Native
Nova Scotia	SNA	No
Saskatchewan	SNA	No
Quebec	S4	Yes
Ontario	S5	Yes
Alberta	SNA	No
Manitoba	S4	Yes
New Brunswick	SNA	No
Prince Edward Island	SNA	No

United StatesN5

Province	Rank	Native
New Hampshire	SNR	Yes
Kentucky	S5	Yes
South Dakota	SNR	Yes
Virginia	S5	Yes
New York	SNR	Yes
Maine	SNR	Yes
Georgia	S4	Yes
North Dakota	SNR	Yes
Nebraska	SNR	Yes
Florida	S4	Yes
Wisconsin	SNR	Yes
Iowa	S5	Yes
Illinois	SNR	Yes
Montana	SNR	Yes
Michigan	SNR	Yes
Mississippi	SNR	Yes
Massachusetts	SNR	Yes
North Carolina	S5	Yes
Alabama	SNR	Yes
Rhode Island	SNR	Yes
Connecticut	SNR	Yes
Kansas	S5	Yes
California	SNR	Yes
Louisiana	SNR	Yes
District of Columbia	S5	Yes
South Carolina	SNR	Yes
Washington	SNR	Yes
Arizona	SNR	Yes
Oregon	SNR	Yes
Tennessee	SNR	Yes
Wyoming	S3	Yes
Utah	SNR	Yes
New Jersey	SNR	Yes
Delaware	S5	Yes
Oklahoma	SNR	Yes
Ohio	SNR	Yes
Maryland	SNR	Yes
Minnesota	SNR	Yes
Missouri	SNR	Yes
New Mexico	SNR	Yes
Colorado	S4	Yes
Vermont	S3	Yes
Indiana	S5	Yes
Idaho	SNR	Yes
West Virginia	S5	Yes
Arkansas	SNR	Yes
Pennsylvania	S5	Yes
Texas	SNR	Yes

Plant Characteristics

Economic Value (Genus)No

Roadless Areas (28)

Arizona (1)

Area	Forest	Acres
Tumacacori	Coronado National Forest	44,594

Arkansas (1)

Area	Forest	Acres
Pedestal Rocks	Ozark-St. Francis National Forest	21,957

Florida (1)

Area	Forest	Acres
Clear Lake	Apalachicola National Forest	5,592

Georgia (1)

Area	Forest	Acres
Joe Gap	Chattahoochee National Forest	5,321

Idaho (1)

Area	Forest	Acres
Bear Creek	Caribou-Targhee National Forest	118,582

Illinois (1)

Area	Forest	Acres
Burke Branch	Shawnee National Forest	6,231

New Mexico (1)

Area	Forest	Acres
Gila Box	Gila National Forest	23,759

North Carolina (7)

Area	Forest	Acres
Bald Mountain	Pisgah National Forest	11,085
Balsam Cone	Pisgah National Forest	10,591
Cheoah Bald	Nantahala National Forest	7,795
Craggy Mountain	Pisgah National Forest	2,657
Harper Creek	Pisgah National Forest	7,325
Overflow Creek	Nantahala National Forest	3,379
Tusquitee Bald	Nantahala National Forest	13,670

South Dakota (1)

Area	Forest	Acres
Indian Creek	Buffalo Gap National Grassland	24,666

Tennessee (2)

Area	Forest	Acres
Bald Mountain	Cherokee National Forest	11,743
Slide Hollow	Cherokee National Forest	4,057

Texas (2)

Area	Forest	Acres
Big Creek	National Forests in Texas	1,447
Little Lake Creek	National Forests in Texas	596

Virginia (7)

Area	Forest	Acres
Adams Peak	George Washington National Forest	7,135
Bear Creek	Jefferson National Forest	18,274
Broad Run	Jefferson National Forest	10,971
Hunting Camp Little Wolf Creek	Jefferson National Forest	8,953
New London Bridge Branch	Jefferson National Forest	844
Southern Massanutten	George Washington National Forest	11,985
Three Ridges	George Washington National Forest	4,745

West Virginia (2)

Area	Forest	Acres
Mcgowan Mountain	Monongahela National Forest	10,504
North Mountain Hopeville	Monongahela National Forest	6,525

References (3)

Flora of North America Editorial Committee (FNA). 2006c. Flora of North America north of Mexico. Vol. 21. Magnoliophyta: Asteridae, part 8: Asteraceae, part 3. Oxford Univ. Press, New York. xxii + 616 pp.
Kartesz, J.T. 1994. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland. 2nd edition. 2 vols. Timber Press, Portland, OR.
Weakley, A.S., and Southeastern Flora Team. 2023. Flora of the southeastern United States. Edition of April 14, 2023. University of North Carolina Herbarium (NCU), North Carolina Botanical Garden, University of North Carolina, Chapel Hill. 2105 pp.