Sonchus asper
PNW
AK
BC
ID
MT
OR
WA
393 specimens from 29 herbaria:
Alaska (19)
British Columbia (66)
Idaho (58)
Montana (35)
Oregon (87)
Washington (128)
221 images from 24 herbaria:
ALA (9)
BBLM (1)
BOIS (3)
CIC (13)
CRMO (3)
HJAEFB (2)
HPSU (4)
ID (22)
IDE (3)
IDS (14)
MONT (16)
MONTU (12)
NOCA (5)
PLU (3)
PSM (10)
REED (5)
SOC (7)
SRP (4)
UAAH (7)
UBC (1)
VALE (2)
WCW (3)
WTU (68)
WWB (4)