Perennial herbaceous plants. Strong stems are not hollow and often have remnants of petioles at their bases. Alternately arranged petiolate leaves. The leaf blade is broad and, as a rule, two- and three times pinnate; the shape can be completely different for each species. The inflorescences are large in diameter and contain many white or yellowish-white flowers. Bracts are usually numerous and present on all sides, and they are narrow lanceolate or narrow triangular. The flowers have radial symmetry and double perianth.