Eriophorum vaginatum, the
hare's-tail cottongrass,
tussock cottongrass, or
sheathed cottonsedge, is a species of perennial herbaceous flowering plant in the sedge family Cyperaceae. It is native to bogs and other acidic wetlands throughout the Holarctic Kingdom. It is a 30–60 cm high tussock-forming plant with solitary spikes.
(Wikipedia)