Betula occidentalis
PNW
AK
BC
ID
MT
OR
WA
YK
1044 specimens from 33 herbaria:
Alaska (30)
British Columbia (89)
Idaho (310)
Montana (241)
Oregon (143)
Washington (208)
Yukon Territory (23)
527 images from 29 herbaria:
ALA (30)
BABY (8)
BBLM (1)
BOIS (11)
CIC (7)
CIC-PYNF (1)
CRMO (3)
DPP (1)
EWU (15)
HPSU (5)
ID (131)
IDE (2)
IDS (48)
LEA (1)
MONT (60)
MONTU (68)
NOCA (5)
PSM (7)
REED (2)
RM (6)
SBLM (1)
SOC (3)
SRP (47)
UBC (13)
USFS (22)
VALE (6)
WCW (6)
WTU (9)
WWB (8)