Potentilla is a genus containing over 500 species of annual, biennial and perennial herbaceous flowering plants in the rose family, Rosaceae.
Potentillas may also be called cinquefoils in English, but they have also been called five fingers and silverweeds. Some species are called tormentils, though this is often used specifically for common tormentil (P. erecta). Others are referred to as barren strawberries, which may also refer to P. sterilis in particular, or to the closely related Waldsteinia fragarioides. Several other cinquefoils formerly included here are now separated in distinct genera – notably the popular garden shrub P. fruticosa, now Dasiphora fruticosa.
Potentillas are generally found throughout the northern continents of the world (holarctic), though some occur in montane biomes of the New Guinea Highlands.
Description
Potentilla diversifolia at 1,636 metres (5,367 ft) in Olympic National Park
Typical cinquefoils look most similar to strawberries, but differ in usually having dry, inedible fruit (hence the name "barren strawberry" for some species). Many cinquefoil species have palmate leaves. Some species have just three leaflets, while others have fifteen or more leaflets arranged pinnately. The flowers are usually yellow, but may be white, pinkish or red. The accessory fruits are usually dry but may be fleshy and strawberry-like, while the actual seeds – each one technically a single fruit – are tiny nuts.
Taxonomy
European cinquefoil (P. reptans), the type species of Potentilla, was described by Linnaeus in 1753.
Among the Rosaceae, cinquefoils are close relatives of avens (genus Geum) and roses (Rosa), and even closer relatives of agrimonies (Agrimonia). Yet more closely related to Potentilla are lady's mantles (Alchemilla) and strawberries (Fragaria). Dryas is a more distantly related genus, long-held beliefs notwithstanding.
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