Centaurea
nigrescens
PNW
BC
ID
OR
WA
43 specimens from 11 herbaria:
British Columbia (2)
Idaho (11)
Oregon (15)
Washington (15)
29 images from 6 herbaria:
IDE (19)
NOCA (4)
PSM (1)
SRP (1)
WSTC (1)
WTU (3)
