Native to mountains of Northern California and Oregon. Large, round clusters of pink flowers appear on bare stalks to 6 feet tall in spring. Shield-shaped, 1- to 2 feet-wide leaves appear later on 2- to 6 feet stalks. Each plant spreads 48 feet wide. Stout rhizomes to 2 inches thick grow in damp ground or even into streams. A spectacular plant for pond, stream, or damp, cool woodland site. 'Nana' is compact, to 2 feet high.