Sonchus arvensis
PNW
AK
BC
ID
MT
OR
WA
373 specimens from 26 herbaria:
Alaska (10)
British Columbia (71)
Idaho (50)
Montana (93)
Oregon (27)
Washington (118)
251 images from 22 herbaria:
BBLM (1)
BBLM-OWY (1)
CIC (3)
EWU (2)
HPSU (5)
ID (27)
IDE (7)
IDS (8)
LEA (1)
MONT (43)
MONTU (39)
NOCA (8)
OSC (3)
PLU (5)
PSM (5)
SBLM (1)
SRP (4)
UAAH (10)
UBC (1)
WS (4)
WTU (66)
WWB (7)