Spirodela polyrhiza
PNW
AK
BC
ID
MT
OR
WA
206 specimens from 22 herbaria:
Alaska (1)
British Columbia (26)
Idaho (29)
Montana (35)
Oregon (41)
Washington (74)
104 images from 20 herbaria:
CIC (3)
EWU (1)
HPSU (2)
ID (20)
IDE (1)
IDS (1)
MONT (2)
MONTU (17)
NOCA (2)
OSC (17)
PLU (2)
PSM (3)
SOC (3)
SRP (5)
UAAH (1)
UBC (3)
WCW (1)
WS (1)
WTU (15)
WWB (4)