Sonchus
arvensis
ssp.
uliginosus
PNW
AK
BC
ID
MT
OR
WA
148 specimens from 17 herbaria:
Alaska (2)
British Columbia (23)
Idaho (10)
Montana (56)
Oregon (17)
Washington (36)
100 images from 13 herbaria:
CIC (2)
HPSU (1)
ID (12)
IDS (2)
MONT (37)
MONTU (13)
NOCA (4)
OSC (1)
SBLM (1)
UAAH (2)
WS (2)
WTU (21)
WWB (2)