CalPhotos - Centaurea calcitrapa
https://calphotos.berkeley.edu/cgi/img_query?where-genre=Plant&where-taxon=Cent…
University of California - Berkeley. Digital Library Project.
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Class A Noxious Weed: Purple Starthistle
https://www.nwcb.wa.gov/weeds/purple-starthistleWashington State Noxious Weed Control Board.
Early Detection & Distribution Mapping System (EDDMapS) - Purple Starthistle
https://www.eddmaps.org/distribution/usstate.cfm?sub=5268University of Georgia. Center for Invasive Species and Ecosystem Health.
Provides state, county, point and GIS data. Maps can be downloaded and shared.
Encycloweedia: Data Sheet - Centaurea genus
https://www.cdfa.ca.gov/plant/ipc/encycloweedia/weedinfo/centaurea.htmCalifornia Department of Food and Agriculture.
See also: Included on California's noxious weed list; see Encycloweedia: Program Details for additional resources
Exotic Species: Purple Starthistle
2010https://www.nps.gov/articles/purple-starthistle.htmDOI. NPS. Science of the American Southwest.
See also: Fact Sheets for Invasive Exotic Plants for more fact sheets
Google Images - Purple Star Thistle
https://www.google.com/search?q=%22purple%20starthistle%22&tbm=ischGoogle.
Invasive Plant Atlas of the United States - Purple Starthistle
https://www.invasiveplantatlas.org/subject.html?sub=5268University of Georgia. Center for Invasive Species and Ecosystem Health.
Invasive Plants of California's Wildlands - Centaurea calcitrapa
https://www.cal-ipc.org/resources/library/publications/ipcw/report26/California Invasive Plant Council.
In online book: Bossard, C.C., J.M. Randall, and M.C. Hoshovsky (Editors). 2000. Invasive Plants of California's Wildlands. University of California Press. Berkeley, CA
Invasive.org - Purple Starthistle
https://www.invasive.org/browse/subthumb.cfm?sub=5268&start=1University of Georgia. Center for Invasive Species and Ecosystem Health.
Plant Pest Risk Assessment for Purple Starthistle, Centaurea calcitrapa
Sep 2010PDF2.82 MBhttps://library.state.or.us/repository/2010/201010251137511/index.pdfOregon Department of Agriculture.
PLANTS Database - Red Star-thistle
https://plants.usda.gov/home/plantProfile?symbol=CECA2USDA. NRCS. National Plant Data Center.
Purple Star-thistle Control
Apr 2012PDF147 KBhttps://ucanr.edu/sites/Grown_in_Marin/files/162871.pdfMarin Agricultural Land Trust (California).
TISI Inventory - Purple Star Thistle
https://tsusinvasives.org/home/database/centaurea-calcitrapaTexas State University System. Texas Invasive Species Institute.
U.S. National Plant Germplasm System - Centaurea calcitrapa
https://npgsweb.ars-grin.gov/gringlobal/taxon/taxonomydetail?id=316612USDA. ARS. National Genetic Resources Program. GRIN-Global.
Weed Control in Natural Areas in the Western United States: Purple and Iberian Starthistle
2013PDF243 KBhttps://wric.ucdavis.edu/information/natural%20areas/wr_C/Centaurea_calcitrapa-…University of California. Weed Research and Information Center.
See also: Weeds in Natural Areas for more information sheets
Weeds Australia - Star Thistle (Centaurea calcitrapa)
https://profiles.ala.org.au/opus/weeds-australia/profile/Centaurea%20calcitrapaCentre for Invasive Species Solutions; Atlas of Living Australia; Australian Government. Department of Agriculture, Water and the Environment.
YouTube - Purple Starthistle
https://www.youtube.com/watch?v=avNi8qQ9A-YGoogle. YouTube; Elsberg Studios.
Made for the Idaho Weed Awareness Campaign.