Common name: Maltese starthistle or tocalote
Family: Asteraceae (the sunflower family)
Introduced, noxious weed
Click on links below to see:
Weedy stand of Maltese starthistle, side of road
External links:
Images, distribution and species description from the Berkeley Digital Library & the Jepson Manual
Background information on Centaurea melitensis from the California Invasive Plant Council