A genus comprising about thirty species of hardy perennial plants, very useful for forming groups in the flower-border, and for cutting for indoor decoration. They bear yellow, red or white flowers, some varieties being single-flowered and others double.

They are of easy culture and thrive in any soil. Propagate by division of the roots in Winter or early Spring or by seeds sown, one-quarter of an inch deep, in October, where they are to bloom, thinning out the seedlings to one foot apart when they are about two inches high.