Ceratophyllum demersum
PNW
AK
BC
ID
MT
OR
WA
YK
573 specimens from 25 herbaria:
Alaska (13)
British Columbia (196)
Idaho (55)
Montana (60)
Oregon (118)
Washington (129)
Yukon Territory (2)
194 images from 21 herbaria:
ALA (7)
BABY (2)
CIC (12)
EWU (19)
HPSU (18)
ID (31)
IDE (2)
IDS (8)
MONT (9)
MONTU (29)
PLU (2)
PSM (1)
REED (1)
RM (1)
SOC (5)
SRP (13)
UBC (1)
VALE (4)
WCW (1)
WTU (23)
WWB (5)