Spiraea has flowers and fruits. Flowers usually bloom between April and May. Umbrella, a large number of flowers. Bracts are linear and glabrous. Calyx tube is bell-shaped, hairless outside and pubescent inside. Sepals are triangular, petals are white and nearly round. The fruiting period is from July to September, with _ _ fruit and erect hairless. Style terminal, usually obliquely spreading, sepals erect.