Equisetum sylvaticum
PNW
AK
BC
ID
MT
OR
WA
387 specimens from 19 herbaria:
Alaska (40)
British Columbia (181)
Idaho (71)
Montana (50)
Oregon (1)
Washington (34)
199 images from 16 herbaria:
BOIS (1)
HPSU (1)
ID (45)
IDS (2)
MONT (6)
MONTU (32)
NOCA (1)
OSC (17)
PLU (3)
PSM (4)
SRP (10)
UAAH (8)
UBC (16)
WCW (3)
WTU (48)
WWB (2)