Taxon: Ambrosia confertiflora DC.

Summary

Genus:

Ambrosia

Family:

Asteraceae (alt. Compositae)

Subfamily:

Asteroideae

Tribe:

Heliantheae

Nomen number:

316549

Place of publication:

Prodr. 5:526. 1836

Verified:

10/29/2007 ARS Systematic Botanists.

Accessions:

2 (2 active, 0 available) in National Plant Germplasm System. (Map it)

Other conspecific taxa

Autonyms (not in current use), synonyms and invalid designations

Homotypic Synonym(s)
Franseria confertiflora (DC.) Rydb.

No images

Conservation Status

Reference(s)

Correll, D. S. & M. C. Johnston. 1970. Manual of the vascular plants of Texas
Cronquist, A. et al. 1972-. Intermountain flora.
Euro+Med Editorial Committee. Euro+Med Plantbase: the information resource for Euro-Mediterranean plant diversity (on-line resource).
FNA Editorial Committee. 1993-. Flora of North America.
Hickman, J. C., ed. 1993. The Jepson manual: higher plants of California
Liogier, H. A. & L. F. Martorell. 1982. Flora of Puerto Rico and adjacent islands: a systematic synopsis.
McGregor, R. L. et al. (The Great Plains Flora Association). 1986. Flora of the Great Plains.
McVaugh, R. 1983-. Flora Novo-Galiciana.
Parsons, W. T. & E. G. Cuthbertson. 1992. Noxious weeds of Australia Inkata Press, Melbourne, Australia.
Payne, W. W. 1964. A re-evaluation of the genus Ambrosia (Compositae). J. Arnold Arbor. 45:419.
Rzedowski, J. & G. Rzedowski, eds. 1991-. Flora del Bajio y de regiones adyacentes.
Vibrans, H., ed. Malezas de México (on-line resource).

Common names

Language	Name	Alternate name	note	seq	Citation
English	bur ragweed			1	Parsons, W. T. & E. G. Cuthbertson. 1992. Noxious weeds of Australia Inkata Press, Melbourne, Australia.

Distribution

order_code	Status	Continent	Subcontinent	Country	State	Note	Reference
1	Native	Northern America	North-Central U.S.A.	United States	Kansas	s.w.	FNA Editorial Committee. 1993-. Flora of North America.
1	Native	Northern America	North-Central U.S.A.	United States	Oklahoma	w.	FNA Editorial Committee. 1993-. Flora of North America.
1	Native	Northern America	Northern Mexico	Mexico	Baja California (Norte)		McVaugh, R. 1983-. Flora Novo-Galiciana.
1	Native	Northern America	Northern Mexico	Mexico	Baja California Sur		McVaugh, R. 1983-. Flora Novo-Galiciana.
1	Native	Northern America	Northern Mexico	Mexico	Chihuahua		Rzedowski, J. & G. Rzedowski, eds. 1991-. Flora del Bajio y de regiones adyacentes.
1	Native	Northern America	Northern Mexico	Mexico	Coahuila de Zaragoza		McVaugh, R. 1983-. Flora Novo-Galiciana.
1	Native	Northern America	Northern Mexico	Mexico	Durango		McVaugh, R. 1983-. Flora Novo-Galiciana.
1	Native	Northern America	Northern Mexico	Mexico	Nuevo León		McVaugh, R. 1983-. Flora Novo-Galiciana.
1	Native	Northern America	Northern Mexico	Mexico	San Luis Potosí		McVaugh, R. 1983-. Flora Novo-Galiciana.
1	Native	Northern America	Northern Mexico	Mexico	Sinaloa		McVaugh, R. 1983-. Flora Novo-Galiciana.
1	Native	Northern America	Northern Mexico	Mexico	Sonora		McVaugh, R. 1983-. Flora Novo-Galiciana.
1	Native	Northern America	Northern Mexico	Mexico	Tamaulipas		McVaugh, R. 1983-. Flora Novo-Galiciana.
1	Native	Northern America	Northern Mexico	Mexico	Zacatecas		McVaugh, R. 1983-. Flora Novo-Galiciana.
1	Native	Northern America	Northwestern U.S.A.	United States	Colorado	s.e.	FNA Editorial Committee. 1993-. Flora of North America.
1	Native	Northern America	South-Central U.S.A.	United States	New Mexico		FNA Editorial Committee. 1993-. Flora of North America.
1	Native	Northern America	South-Central U.S.A.	United States	Texas		FNA Editorial Committee. 1993-. Flora of North America.
1	Native	Northern America	Southeastern U.S.A.	United States	Tennessee		FNA Editorial Committee. 1993-. Flora of North America.
1	Native	Northern America	Southern Mexico	Mexico	Aguascalientes		McVaugh, R. 1983-. Flora Novo-Galiciana.
1	Native	Northern America	Southern Mexico	Mexico	Guanajuato		McVaugh, R. 1983-. Flora Novo-Galiciana.
1	Native	Northern America	Southern Mexico	Mexico	Hidalgo		Rzedowski, J. & G. Rzedowski, eds. 1991-. Flora del Bajio y de regiones adyacentes.
1	Native	Northern America	Southern Mexico	Mexico	Jalisco	n.e.	McVaugh, R. 1983-. Flora Novo-Galiciana.
1	Native	Northern America	Southern Mexico	Mexico	México		Rzedowski, J. & G. Rzedowski, eds. 1991-. Flora del Bajio y de regiones adyacentes.
1	Native	Northern America	Southern Mexico	Mexico	Querétaro		Rzedowski, J. & G. Rzedowski, eds. 1991-. Flora del Bajio y de regiones adyacentes.
1	Native	Northern America	Southwestern U.S.A.	United States	Arizona		FNA Editorial Committee. 1993-. Flora of North America.
1	Native	Northern America	Southwestern U.S.A.	United States	California	s.	FNA Editorial Committee. 1993-. Flora of North America.
1	Native	Northern America	Southwestern U.S.A.	United States	Utah	Washington Co.	FNA Editorial Committee. 1993-. Flora of North America.
3	Adventive	Asia-Temperate	Western Asia	Israel			Euro+Med Editorial Committee. Euro+Med Plantbase: the information resource for Euro-Mediterranean plant diversity (on-line resource).
4	Naturalized	Australasia	Australia	Australia	New South Wales		Parsons, W. T. & E. G. Cuthbertson. 1992. Noxious weeds of Australia Inkata Press, Melbourne, Australia.
4	Naturalized	Australasia	Australia	Australia	Queensland		Parsons, W. T. & E. G. Cuthbertson. 1992. Noxious weeds of Australia Inkata Press, Melbourne, Australia.

Native
Northern America

NORTH-CENTRAL U.S.A.: United States [Kansas (s.w.), Oklahoma (w.)]
NORTHWESTERN U.S.A.: United States [Colorado (s.e.)]
SOUTHEASTERN U.S.A.: United States [Tennessee]
SOUTH-CENTRAL U.S.A.: United States [New Mexico, Texas]
SOUTHWESTERN U.S.A.: United States [Arizona, California (s.), Utah (Washington Co.)]
NORTHERN MEXICO: Mexico [Baja California (Norte), Baja California Sur, Chihuahua, Coahuila de Zaragoza, Durango, Nuevo León, San Luis Potosí, Sinaloa, Sonora, Tamaulipas, Zacatecas]
SOUTHERN MEXICO: Mexico [Aguascalientes, Guanajuato, Hidalgo, Jalisco (n.e.), México, Querétaro]

Adventive
Asia-Temperate

WESTERN ASIA: Israel

Naturalized
Australasia

AUSTRALIA: Australia [New South Wales, Queensland]

Reference(s)

Euro+Med Editorial Committee. Euro+Med Plantbase: the information resource for Euro-Mediterranean plant diversity (on-line resource).
FNA Editorial Committee. 1993-. Flora of North America.
McVaugh, R. 1983-. Flora Novo-Galiciana.
Parsons, W. T. & E. G. Cuthbertson. 1992. Noxious weeds of Australia Inkata Press, Melbourne, Australia.
Rzedowski, J. & G. Rzedowski, eds. 1991-. Flora del Bajio y de regiones adyacentes.

Economic Uses

Usage	Type	Note	Reference
Weed	seed contaminant	potential	Parsons, W. T. & E. G. Cuthbertson. 1992. Noxious weeds of Australia Inkata Press, Melbourne, Australia.

Cite as: USDA, Agricultural Research Service, National Plant Germplasm System. 2026. Germplasm Resources Information Network (GRIN Taxonomy). National Germplasm Resources Laboratory, Beltsville, Maryland.
URL: https://npgstest.ars-grin.gov/gringlobal/taxon/taxonomydetail?id=316549. Accessed 12 May 2026.