Knapweed Knapweed: Photographs, descriptions and distribution information for spotted knapweed (Centaurea maculosa), brown knapweed (Centaurea jacea) and Russian knapweed (Centaurea repens). From the Ontario Ministry of Agriculture and Food. (Centaurea) http://www.ovma.on.ca/Weeds/knapweed.htm
Purple Starthistle Identification Purple Starthistle Identification: Identifying photographs for Centaurea calcitrapa. From King County, Washington, Department of Natural Resources. (Centaurea) http://dnr.metrokc.gov/wlr/lands/Weeds/star.htm
Centaurea tauromenitana Centaurea tauromenitana: Image of plant, close-up of flower head. (Centaurea) http://www.dipbot.unict.it/orto/0440-1.html
Centaurea calcitrapa Centaurea calcitrapa: Red Star-Thistle. Detailed plant classification, national distribution maps, status as invasive plant and noxious weed. From the USDA PLANTS data base. (Centaurea) http://plants.usda.gov/cgi_bin/plant_profile.cgi?symbol=CECA2
CalFlora: Centaurea calcitrapa CalFlora: Centaurea calcitrapa: Common names: red or purple starthistle. Photographs and description, distribution map for California, classification as invasive species and noxious weed. (Centaurea) http://elib.cs.berkeley.edu/cgi/calflora_query?special=xwalk&where-calrecnum=1845&one=T
Additional
Information: Canadian Content has no additional information.
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