Cirsium
arvense
PNW
AK
BC
ID
MT
OR
WA
730 specimens from 43 herbaria:
Alaska (14)
British Columbia (106)
Idaho (154)
Montana (104)
Oregon (154)
Washington (196)
418 images from 36 herbaria:
BBLM (2)
BBLM-OWY (1)
BOIS (3)
CIC (19)
COCC (2)
CRMO (3)
EWU (5)
HJAEFB (1)
HPSU (13)
ID (53)
IDE (9)
IDS (31)
IFBLM (1)
LEA (1)
MONT (52)
MONTU (38)
MORA (2)
NEZ (1)
NOCA (6)
OSC (62)
PLU (4)
PSM (2)
REED (1)
SAJH (1)
SEF (1)
SOC (1)
SRP (14)
TFBLM (1)
UAAH (9)
UBC (7)
UWB (3)
VALE (3)
WCW (12)
WS (6)
WTU (37)
WWB (11)