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This is the Spotted Knapweed (Centaurea maculosa) Flower. Since 1997, a total of 185 knapweed sites have been located, mapped and inventoried. In 2001-02 the SRRC has been developing GIS/GPS map layers for specific noxious weed species. High risk areas such as trailheads, tanker fill areas, river access, rock sources, and sensitive areas will be given extra attention.


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Since 1998 the SRRC has prevented more than 99.9 % of the knapweed plants from seeding. According to the SRRC Inventory there has been 60% reduction of all knapweed plants at all sites annually since 1999.


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This is a Diffuse Knapweed (Centaurea diffusa Lam.) in bloom.


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This is a Meadow Knapweed in bloom.


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This is Yellow Star thistle (Centaurea solstitialis) in bloom.


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This is Scotch Broom (Cytisus scoparius) in bloom.


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This is Marlahan Mustard, also known as Dyer's Woad (Isatis tinctoria L.) in bloom.


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This is White Top in bloom.