Sonchus arvensis ssp. arvensis
PNW
AK
BC
ID
MT
OR
WA
53 specimens from 9 herbaria:
Alaska (1)
British Columbia (10)
Idaho (6)
Montana (2)
Oregon (2)
Washington (32)
21 images from 7 herbaria:
CIC (1)
MONTU (2)
OSC (1)
UAAH (1)
UBC (1)
WS (1)
WTU (14)