Equisetum
pratense
PNW
AK
BC
ID
MT
OR
WA
162 specimens from 16 herbaria:
Alaska (13)
British Columbia (104)
Idaho (7)
Montana (9)
Oregon (3)
Washington (10)
55 images from 13 herbaria:
CIC (3)
HPSU (3)
ID (5)
IDS (2)
LEA (1)
MONT (4)
MONTU (3)
OSC (2)
SRP (4)
UAAH (2)
UBC (12)
WTU (13)
WWB (1)