Taxon: Ambrosia trifida L.

Genus: Ambrosia
Family: Asteraceae (alt.Compositae)
Nomen number: 103827
Place of publication: Sp. pl. 2:987. 1753
Link to protologue:
Name Verified on: 23-Feb-2012 by ARS Systematic Botanists. Last Changed: 23-Feb-2012
Species priority site is:
Accessions: 1 in National Plant Germplasm System

Common names:

  • buffalo-weed  (Source: AH 505) - English
  • giant ragweed  (Source: World Econ Pl) - English
  • horseweed  (Source: F Ohio) - English
  • grande herbe à poux  (Source: F NAmer) - French
  • dreilappiges Traubenkraut  (Source: Zander Ency) - German
  • hästambrosia  (Source: Kulturvaxtdatabas) - Swedish
  • san lie ye tun cao  (Source: F ChinaEng) - Transcribed Chinese

Economic Importance:

  • Vertebrate poisons: mammals (to humans, source of allergenic airborne pollen fide F NGalicia)
  • Weed: potential seed contaminant (fide Intermt F)

Distributional Range:


  • Northern America

    • Eastern Canada: Canada New Brunswick, Nova Scotia, Ontario, Prince Edward Island, Quebec
    • North-Central U.S.A.: United States Illinois, Iowa, Kansas, Minnesota, Missouri, Nebraska, North Dakota, Oklahoma, South Dakota, Wisconsin
    • Northeastern U.S.A.: United States Indiana, Michigan, Ohio, Pennsylvania, West Virginia
    • Northern Mexico: Mexico Chihuahua, Coahuila, Sonora
    • Northwestern U.S.A.: United States Colorado, Montana, Wyoming
    • South-Central U.S.A.: United States Texas
    • Southeastern U.S.A.: United States Alabama, Arkansas, Georgia, Kentucky, Louisiana, Maryland, Mississippi, North Carolina, South Carolina, Tennessee, Virginia
    • Western Canada: Canada Alberta, British Columbia, Manitoba, Saskatchewan

  • Naturalized

  • Asia-Temperate

    • Caucasus: Georgia
    • China: China
    • Eastern Asia: Japan
  • Europe

    • Eastern Europe: Lithuania
    • Middle Europe: Germany ; Netherlands ; Slovakia
    • Northern Europe: Denmark ; United Kingdom
    • Southeastern Europe: Italy
    • Southwestern Europe: France ; Spain

  • Adventive

  • Asia-Temperate

    • Western Asia: Israel
  • Europe

    • Eastern Europe: Belarus ; Estonia ; Latvia ; Moldova ; Russian Federation-European part European part; Ukraine
    • Middle Europe: Austria ; Belgium ; Czech Republic ; Poland ; Switzerland
    • Northern Europe: Ireland
    • Southeastern Europe: Serbia ; Slovenia


  • Aldén, B., S. Ryman, & M. Hjertson Svensk Kulturväxtdatabas, SKUD (Swedish Cultivated and Utility Plants Database; online resource on 2012 (Kulturvaxtdatabas)
  • Brown, R. G. & M. L. Brown Herbaceous plants of Maryland. 1984 (HPl Mary)
  • Correll, D. S. & M. C. Johnston Manual of the vascular plants of Texas. 1970 (F Tex)
  • Cronquist, A. et al. Intermountain flora. (Intermt F)
  • Deam, C. C. Flora of Indiana. (F Indiana)
  • Erhardt, W. et al. Der große Zander: Enzyklopädie der Pflanzennamen. 2008 (Zander Ency)
  • Euro+Med Editorial Committee Euro+Med Plantbase: the information resource for Euro-Mediterranean plant diversity (on-line resource). (EuroMed Plantbase)
  • FNA Editorial Committee Flora of North America. (F NAmer)
  • Gleason, H. A. & A. Cronquist Manual of vascular plants of northeastern United States and adjacent Canada. (Glea Cron)
  • Groth, D. 2005. pers. comm. (pers. comm.)
  • Iwatsuki, K. et al. Flora of Japan. (F Japan)
  • Jarvis, C. E. & N. J. Turland, eds. 1998. Typification of Linnaean specific and varietal names in the Compositae (Asteraceae) (Taxon) 47:351.
  • Komarov, V. L. et al., eds. Flora SSSR. (F USSR)
  • McGregor, R. L. et al. (The Great Plains Flora Association) Flora of the Great Plains. (F GPlains)
  • McGregor, R. L. et al. (The Great Plains Flora Association) Atlas of the Flora of the Great Plains. (Atlas GPlains)
  • McVaugh, R. Flora Novo-Galiciana. (F NGalicia)
  • Munz, P. A. & D. D. Keck A California flora. (F CalifMunz)
  • Ohio Flora Committee (E. L. Braun, T. S. Cooperrider, T. R. Fisher, J. J. Furlow) The vascular flora of Ohio. (F Ohio)
  • Radford, A. E. et al. Manual of the vascular flora of the Carolinas. (F Carolin)
  • Radford, A. E. et al., eds. Vascular flora of the southeastern United States. (F SE US)
  • Scoggan, H. J. The flora of Canada, 4 vol. (F Canada)
  • Seed Regulatory and Testing Division, Agricultural Marketing Service, U.S.D.A. State noxious-weed seed requirements recognized in the administration of the Federal Seed Act (updated annually). (State Noxweed Seed)
  • Steyermark, J. A. Flora of Missouri. (F Missouri)
  • Terrell, E. E. et al. Agric. Handb. no. 505. 1986 (AH 505)
  • Tutin, T. G. et al., eds. Flora europaea. (F Eur)
  • Voss, E. Michigan flora. (F Mich)
  • Wu Zheng-yi & P. H. Raven et al., eds. Flora of China (English edition). (F ChinaEng)
  • Wunderlin, R. P. Guide to the vascular plants of Florida. 1998 (F Florida)

Check other web resources for Ambrosia trifida L. :


  • Fruits: U.S. National Seed Herbarium image