Equisetum ×ferrissii
PNW
BC
ID
MT
OR
WA
137 specimens from 16 herbaria:
British Columbia (15)
Idaho (9)
Montana (18)
Oregon (49)
Washington (46)
93 images from 13 herbaria:
CIC (4)
CIC-PYNF (1)
HPSU (2)
ID (6)
MONTU (6)
RM (1)
SOC (1)
SRP (2)
UBC (4)
USFS (4)
WCW (1)
WTU (59)
WWB (2)