All appendages on involucral bracts appear lacerate. This knapweed is present on the territory of Tidmarsh farms along with the dominating C. x moncktonii, a species of hybrid origin (C. jacea x C. nigra), whose bract appendages are variable. The most problematic of alien knapweeds, C. stoebe ssp. micranthos is also present, though, as of 2015, only along Beaver Dam Road.