Mentha arvensis
PNW
AK
BC
ID
MT
OR
WA
60 specimens from 11 herbaria:
Alaska (8)
British Columbia (13)
Idaho (10)
Montana (7)
Oregon (5)
Washington (11)
30 images from 10 herbaria:
BABY (3)
EWU (1)
ID (5)
IDS (1)
MONT (4)
REED (2)
UAAH (5)
UBC (3)
WS (1)
WTU (5)