Potamogeton berchtoldii
PNW
AK
BC
ID
MT
OR
WA
YK
293 specimens from 21 herbaria:
Alaska (49)
British Columbia (76)
Idaho (26)
Montana (24)
Oregon (31)
Washington (81)
Yukon Territory (6)
113 images from 15 herbaria:
ALA (39)
BABY (3)
CIC (6)
EWU (1)
HPSU (4)
ID (33)
IDE (2)
IDS (1)
MONT (1)
NOCA (6)
PNNL (2)
SRP (1)
UBC (1)
WTU (3)
WWB (10)