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ipm.ppws.vt.edu/...cenma.htm - Cached
This link has been bookmarked by 1 people . It was first bookmarked on 25 Jun 2008, by Sheryl A. McCoy.
an excellent primer to use for general identification of the spotted knapweed from primary leaves to flowers
noxious weed star thistle cornflower Centaurea Eurasia botany science knapweed
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