Cirsium arvense
PNW
AK
BC
ID
MT
OR
WA
YK
843 specimens from 39 herbaria:
Alaska (27)
British Columbia (97)
Idaho (172)
Montana (212)
Oregon (153)
Washington (180)
Yukon Territory (2)
375 images from 31 herbaria:
ALA (11)
BBLM (2)
BBLM-OWY (1)
BOIS (3)
CIC (19)
CRMO (3)
EWU (5)
HJAEFB (1)
HPSU (13)
ID (48)
IDE (7)
IDS (31)
LEA (1)
MONT (52)
MONTU (38)
NOCA (6)
PLU (4)
PNNL (2)
PSM (2)
REED (1)
RM (14)
SOC (1)
SRP (10)
UAAH (8)
UBC (7)
USFS (30)
UWB (3)
VALE (3)
WCW (12)
WTU (26)
WWB (11)