 Many genera are also highly valued ornamental plants.These include trees and shrubs ("Cotoneaster", "Chaenomeles", "Crataegus", "Dasiphora", "Exochorda", "Kerria", "Photinia", "Physocarpus", "Prunus", "Pyracantha", "Rhodotypos", "Rosa", "Sorbus", "Spiraea"), herbaceous perennials ("Alchemilla", "Aruncus", "Filipendula", "Geum", "Potentilla", "Sanguisorba"), alpine plants ("Dryas", "Geum", "Potentilla") and climbers ("Rosa").However, several genera are also introduced noxious weeds in some parts of the world, costing money to be controlled.