This is a large genus, including rightly popular shrubs that flower all summer, as well as many smaller plants, suitable for the rock garden. They are known as cinquefoils, although not all have the leaves divided into five leaflets. Sibbaldia and Sibbaldiopsis are closely related, both having the tips of the leaves divided into three broad teeth.
Potentilla nepalensis 'Miss Willmott' is a herbaceous perennial, which has pretty, bright rosy-pink open flowers on sturdy long stems that often sprawl (but do not layer) at ground level. This is an old variety, which has become quite popular and well known.