Sonchus arvensis ssp. arvensis
PNW
AK
BC
ID
MT
OR
WA
45 specimens from 8 herbaria:
Alaska (1)
British Columbia (10)
Idaho (5)
Montana (2)
Oregon (2)
Washington (25)
12 images from 4 herbaria:
MONTU (2)
UAAH (1)
UBC (1)
WTU (8)