Centaurea genus -- aster Subfamily 4

garden cornflower (Centaurea cyanus) -- in July -- Floriston, northern California      blue & purple   

garden cornflower (Centaurea cyanus) -- in July -- Klamath Falls to Ashland (Rt. 66), OR    blue & purple   

diffuse knapweed (Centaurea diffusa) -- in August -- Cameron Pass, Roosevelt National Forest, CO    white & cream   

diffuse knapweed (Centaurea diffusa) -- in June -- Saint Vrain State Park, CO     white & cream

diffuse knapweed (Centaurea diffusa) --- in August -- Indian Meadows North, Poudre Canyon, Larimer County, CO

diffuse knapweed (Centaurea diffusa) -- in August -- Saint Vrain State Park, CO    

Maltese star thistle (Centaurea melitensis) -- in April -- Big Bend National Park, Texas     yellow & orange ​   

spotted knapweed (Centaurea stoebe) -- in September -- Lincoln National Forest, NM      red & pink       ​