Ambrosia chamissonis
PNW
AK
BC
OR
WA
281 specimens from 18 herbaria:
Alaska (4)
British Columbia (57)
Oregon (94)
Washington (126)
65 images from 15 herbaria:
ALA (3)
BABY (1)
HPSU (1)
ID (6)
LEA (1)
MONT (2)
PLU (6)
PSM (7)
REED (3)
SOC (3)
SRP (4)
UBC (3)
WCW (3)
WTU (13)
WWB (9)