Bistorta amplexicaulis
Bistorta amplexicaulis, the red bistort or mountain fleece, is a species of flowering plant in the buckwheat family Polygonaceae, native to China, the Himalayas, and Pakistan. It is a damp-loving herbaceous perennial growing to tall and wide, with heart-shaped pointed leaves, downy beneath, and narrow spikes of rose-red or white flowers in summer.
Numerous cultivars have been developed for garden use, including 'Firetail'.