A genus of small, hardy, deciduous shrubs from around the temperate regions of the northern hemisphere, with the greatest concentration in east Asia. The herbaceous species that used to be included in the genus have now been separated out as Filipendula and Aruncus. The remaining shrubby ones are characterised by have arching branches that can be packed with masses of white or creamy flowers.

Spiraea morrisonicola var. hayatana comes from the mountains of Taiwan, where it grows at high altitudes. It is a compact, multibranched deciduous shrub, with small (3 to 4 cm long) leaves and rounded dense heads of white flowers with pink stamens.