Ambrosia trifida
PNW
BC
ID
MT
OR
WA
60 specimens from 13 herbaria:
British Columbia (5)
Idaho (7)
Montana (35)
Oregon (9)
Washington (4)
44 images from 9 herbaria:
BOIS (2)
CIC (1)
ID (1)
IDE (2)
MONT (25)
MONTU (9)
OSC (2)
SRP (1)
WTU (1)