Centaurea stoebe ssp. micranthos (Gugler) Hayek25 of 94
August 6, Stony Brook Reservation, Boston
spotted or bushy knapweed
A native of Europe, this knapweed has proved to be invasive
in other eastern states, but so far it is counted only "likely
invasive" in Massachusetts. With more field data, it is likely
to leave this "likely" category.