Field Guide to Noxious and Other Selected Weeds of British Columbia

Yellow Starthistle
(Centaurea solstitialis)

Provincial Noxious Weed
annual taprooted heavily branched weed growing from 0.6 to 1 metre tall; stems are winged and covered with fine hair; yellow flowers are borne on ends of branches and armed with sharp thorns up to 2 cm long
not currently known from British Columbia but close to our borders with Washington and Idaho

Flowerhead bracts end in sharp, stiff spines

Photos courtesy Ben Roche, Washington State University

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