Oenothera biennis
PNW
BC
ID
MT
OR
WA
212 specimens from 24 herbaria:
British Columbia (26)
Idaho (54)
Montana (2)
Oregon (68)
Washington (62)
153 images from 21 herbaria:
BOIS (2)
CIC (14)
EWU (1)
HPSU (17)
ID (15)
IDE (6)
IDS (8)
LEA (1)
MONT (1)
OSC (29)
PLU (3)
PSM (1)
REED (3)
SOC (1)
SRP (6)
TFBLM (1)
UBC (1)
WCW (6)
WS (11)
WTU (16)
WWB (10)