Equisetum ×nelsonii
PNW
BC
MT
OR
WA
10 specimens from 6 herbaria:
British Columbia (4)
Montana (1)
Oregon (1)
Washington (4)
9 images from 6 herbaria:
ID (1)
MONTU (1)
OSC (1)
SRP (1)
UBC (3)
WTU (2)