Sonchus arvensis
PNW
AK
BC
ID
MT
OR
WA
YK
410 specimens from 29 herbaria:
Alaska (20)
British Columbia (69)
Idaho (56)
Montana (130)
Oregon (27)
Washington (103)
Yukon Territory (5)
248 images from 24 herbaria:
ALA (10)
BBLM (1)
BBLM-OWY (1)
EWU (2)
HPSU (5)
ID (27)
IDE (7)
IDS (8)
LEA (1)
MONT (42)
MONTU (37)
NOCA (8)
PLU (5)
PNNL (2)
PSM (5)
RM (4)
SBLM (1)
SRP (4)
UAAH (8)
UBC (1)
USFS (6)
WSTC (1)
WTU (55)
WWB (7)