Betula nana
PNW
AK
BC
ID
MT
WA
YK
373 specimens from 13 herbaria:
Alaska (326)
British Columbia (9)
Idaho (1)
Montana (25)
Washington (2)
Yukon Territory (10)
298 images from 11 herbaria:
ALA (227)
BABY (2)
ID (8)
MONTU (23)
PSM (1)
SRP (1)
UAAH (26)
UBC (4)
WCW (1)
WTU (3)
WWB (2)