| Directory > Science > Biology > Flora and Fauna > Plantae > Magnoliophyta > Magnoliopsida > Asteraceae > Centaurea Centaurea calcitrapa
Red Star-Thistle. Detailed plant classification, national distribution maps, status as invasive
plant and noxious weed. From the USDA PLANTS data base.
http://plants.usda.gov/cgi_bin/plant_profile.cgi?symbol=CECA2
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CalFlora: Centaurea calcitrapa
Common names: red or purple starthistle. Photographs and description, distribution map for
California, classification as invasive species and noxious weed.
http://elib.cs.berkeley.edu/cgi/calflora_query?special=xwalk&where-calrecnum=1845&one=T
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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.
http://www.ovma.on.ca/Weeds/knapweed.htm
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Purple Starthistle Identification
Identifying photographs for Centaurea calcitrapa. From King County, Washington, Department of
Natural Resources.
http://dnr.metrokc.gov/wlr/lands/Weeds/star.htm
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Centaurea tauromenitana
Image of plant, close-up of flower head.
http://www.dipbot.unict.it/orto/0440-1.html
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