|Rhizomatous perennial that forms rosettes. Leaves are pinnate, serrated, narrowly divided, fern-like. Leaflets reach 3/4 inches long. Small, 1/4 to 3/8 inch wide flowers are borne on branched stems in loose, 6 inch wide corymbs in summer. Makes a nice addition to a perennial border. Also known as Flore Pleno, Plena. Native to Europe, northern and central Asia.