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- Provincial Noxious Weed
- biennial to short-lived heavily branched taprooted perennial
growing from 0.6 to 1 metre in height; divided leaves
grayish-green in colour, hairy; very bitter to the taste
- white, occasionally purple flowers; bracts of the flowerheads
with small, sharp, rigid spines
- one of 13 "knapweed" species in British Columbia
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