Xanthium strumarium
PNW
AK
BC
ID
MT
OR
WA
475 specimens from 29 herbaria:
Alaska (1)
British Columbia (30)
Idaho (92)
Montana (127)
Oregon (97)
Washington (128)
232 images from 25 herbaria:
BBLM-OWY (2)
BOIS (3)
CIC (30)
CRMO (2)
HPSU (2)
ID (24)
IDE (3)
IDS (16)
LEA (1)
MONT (31)
MONTU (24)
NOCA (2)
PNNL (2)
PSM (2)
RM (4)
SOC (6)
SRP (8)
UAAH (1)
UBC (1)
USFS (4)
VALE (2)
WCW (4)
WSTC (2)
WTU (55)
WWB (1)