Taxon: Centaurea diffusa Lam.

• Check PlantSearch database of Botanic Gardens Conservation International for possible non-NPGS germplasm.

A declared aquatic or terrestrial noxious weed and/or noxious-weed seed in these U.S. states (see state noxious weed lists), with links to state information or web documents:

AZ*°, CA*, CO*°, ID*°, MT*°, ND*, NE*°, NM*, NV*, OR*°, SD*, UT*°, WA*°, WY*°.

ªAquatic.

*Terrestrial.

°In seed.

Link to noxious weed information from

Link to species profile at

Common names:

• diffuse knapweed   (Source: World Econ Pl ) – English
  
• small-flower star thistle   (Source: F GB Ire ) – English
  
• tumble knapweed   (Source: F NAmer ) – English
  
• white knapweed   (Source: Zander ed16 ) – English
  
• centaurée diffuse   (Source: F NAmer ) – French
  
• sparrige Flockenblume   (Source: Zander ed16 ) – German
  

Economic importance:

• Weed: potential seed contaminant   (fide Rep NCEPPC)
  

Distributional range:

• ASIA-TEMPERATE
  Western Asia: Turkey [n.w.]
  Caucasus: Armenia; Azerbaijan; Georgia; Russian Federation - Ciscaucasia, Dagestan
• EUROPE
  East Europe: Moldova; Ukraine [incl. Krym]
  Southeastern Europe: Bulgaria; Greece; Macedonia; Romania; Serbia

• ASIA-TEMPERATE
  Siberia: Russian Federation - Altay, Krasnoyarsk
• EUROPE
  Middle Europe: Austria; Germany; Hungary; Poland; Switzerland
  Southeastern Europe: Italy; Slovenia
  Southwestern Europe: France; Spain
• NORTHERN AMERICA
  Subarctic America: Canada - Yukon Territory
  Eastern Canada: Canada - Ontario, Quebec
  Western Canada: Canada - Alberta, British Columbia, Saskatchewan
  Northeastern U.S.A.: United States - Connecticut, Indiana, Massachusetts, Michigan, New Hampshire, New Jersey, Rhode Island
  North-Central U.S.A.: United States - Illinois, Iowa, Missouri, Nebraska
  Northwestern U.S.A.: United States - Colorado, Idaho, Montana, Oregon, Washington, Wyoming
  Southeastern U.S.A.: United States - Kentucky, Tennessee
  South-Central U.S.A.: United States - New Mexico
  Southwestern U.S.A.: United States - Arizona, California, Nevada, Utah
• SOUTHERN AMERICA
  Southern South America: Argentina

• EUROPE
  Northern Europe: Norway; United Kingdom
  Middle Europe: Belgium; Czech Republic; Slovakia
  East Europe: Estonia; Latvia; Lithuania

References:

• Cabrera, A. L. & E. M. Zardini. 1978. Manual de la flora de los alrededores de Buenos Aires.
• Campbell, F. T., ed. 1995. Report of National Coalition of Exotic Plant Pest Councils. (unpublished draft)
• Czerepanov, S. K. 1995. Vascular plants of Russia and adjacent states (the former USSR).
• Davis, P. H., ed. 1965–1988. Flora of Turkey and the east Aegean islands.
• Encke, F. et al. 1984. Zander: Handwörterbuch der Pflanzennamen, 13. Auflage.
• Erhardt, W. et al. 2000. Zander: Handwörterbuch der Pflanzennamen, 16. Auflage.
• 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.
• Gleason, H. A. & A. Cronquist. 1963. Manual of vascular plants of northeastern United States and adjacent Canada.
• Groth, D. 2005. pers. comm. [re. Brazilian common names].
• Hess, H. E. et al. 1976. Flora der Schweiz, ed. 2.
• Hitchcock, C. L. et al. 1955–1969. Vascular plants of the Pacific Northwest.
• Instituto de Botánica Darwinion. 2008. Flora del Conosur. Catálogo de las plantas vasculares.
• Kartesz, J. T. 1994. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland.
• Komarov, V. L. et al., eds. 1934–1964. Flora SSSR.
• Krasnoborov, I. M., ed. 2000–. Flora of Siberia (English translation).
• Liberty Hyde Bailey Hortorium. 1976. Hortus third.
• Ochsmann, J. 2001. Knapweeds (Centaurea L. and some related genera) in North America. In: Ochsmann, J., Welcome to the Centaurea pages.
• Scoggan, H. J. 1978–1979. The flora of Canada, 4 vol.
• Seed Regulatory and Testing Branch, Agricultural Marketing Service, U.S.D.A. 1999. State noxious-weed seed requirements recognized in the administration of the Federal Seed Act.
• Sell, P. & G. Murrell. 1996–. Flora of Great Britain and Ireland.
• Steyermark, J. A. 1977. Flora of Missouri.
• Tutin, T. G. et al., eds. 1964–1980. Flora europaea.
• USDA National Agricultural Library. National Invasive Species Information Center (on-line resource).
• Wu Zheng-yi & P. H. Raven et al., eds. 1994–. Flora of China (English edition).

More:

Search AGRICOLA article citation database for citations referencing Centaurea diffusa.

Search NCBI's Entrez search engine for PubMed citations referencing Centaurea diffusa.

Search Biodiversity Heritage Library for historical publications referencing Centaurea diffusa.

Check other web resources for Centaurea diffusa Lam.:

• Flora Europaea: Database of European Plants (ESFEDS)
• Euro+Med Plantbase: Information Resource for Euro-Mediterranean Plant Diversity
• Flora of North America: Collaborative Floristic Effort of North American Botanists
• PLANTS: USDA-NRCS Database of Plants of the United States and its Territories
• BONAP: North American Plant Atlas of the Biota of North America Program
• Flora del Conosur: Catálogo de las Plantas Vasculares del Conosur
• Flora of China: Online version from Harvard University
• TROPICOS: Nomenclatural and Specimen Database of the Missouri Botanical Garden
• ePIC: Electronic Plant Information Centre of Royal Botanic Gardens, Kew
• AGRICOLA: Article Citation Database or NAL Catalog of USDA's National Agricultural Library
• Entrez: NCBI's search engine for PubMed citations, GenBank sequences, etc.

Images:

• Forestry Images: Images of invasive weeds from www.forestryimages.org
• Fruits: Seed ID Workshop image, from Department of Horticulture and Crop Science, Ohio State University

More:

• Check PlantSystematics.org for additional images
• Images Note: Be advised that their identity may be inaccurate. Proper identification of a plant may require specialized taxonomic knowledge or comparison with properly documented herbarium material.

Abbreviations & symbols in GRIN Taxonomy

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