Potentilla
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 Potentilla sterilis leaves
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Potentilla is a genus of about 500 species of annual, biennial and perennial herbs in the rose family Rosaceae, native to most of the Northern Hemisphere. Common names include cinquefoil, tormentil, and barren strawberry.
Many of the species have leaves divided into five leaflets arranged palmately (like the fingers of a hand), whence the name cinquefoil (French, cinque feuilles, "five leaves"), though some species (e.g. P. sterilis) have just three leaflets, and others (e.g. P. anserina) up to 15 or more leaflets arranged pinnately. The leaves of some cinquefoils are eaten by the larvae of some Lepidoptera species - see list of Lepidoptera which feed on Potentilla.
Recent genetic research has resulted in a number of changes to the circumscription of Potentilla (Eriksson et al., 2003).
The genera Duchesnea, Horkelia, and Ivesia, previously all regarded as distinct, have been shown to be members of Potentilla, though this change has not been universally adopted.
Conversely, the shrubby plant previously included in this genus as Potentilla fruticosa, does not to belong to Potentilla at all, and is now treated in the genus Dasiphora as Dasiphora fruticosa.
The two species formerly treated as Potentilla palustris and Potentilla salesowianum are now separated into the genus Comarum, while Potentilla tridentata is transferred to Sibbaldiopsis as Sibbaldiopsis tridentata, and Potentilla arguta is similarly now separated into the genus Drymocallis as Drymocallis arguta.
The silverweeds are also separable into the new genus Argentina, though these are closer to the typical species of Potentilla, and this separation is less well supported.
Potentilla is also related to the genera Geum and Dryas, and also to the strawberries in the genus Fragaria; Potentilla differs from the strawberries in having dry, inedible fruit (hence the name "barren strawberry" for some species).
Some species are grown as garden plants.
[edit] Species
About 500, including:
- Potentilla alba White Cinquefoil
- Potentilla alchemilloides Alchemilla-leaved Cinquefoil
- Potentilla anglica Trailing Tormentil
- Potentilla anserina Silverweed
- Potentilla argentea Hoary Cinquefoil
- Potentilla canadensis Canadian Cinquefoil
- Potentilla cinerea Grey Cinquefoil
- Potentilla crantzii Alpine Cinquefoil
- Potentilla erecta Common tormentil
- Potentilla fragarioides Cinquefoil
- Potentilla glandulosa Sticky Cinquefoil
- Potentilla hickmanii Hickman's potentilla
- Potentilla indica Mock Strawberry
- Potentilla micrantha Pink Barren strawberry
- Potentilla norvegica Norwegian Cinquefoil
- Potentilla palustris Marsh Cinquefoil
- Potentilla pensylvanica Pennsylvania Cinquefoil
- Potentilla recta Sulphur Cinquefoil
- Potentilla reptans Creeping tormentil
- Potentilla rupestris Rock Cinquefoil
- Potentilla simplex Oldfield Cinquefoil
- Potentilla sterilis Barren Strawberry
- Potentilla tabernaemontani Spring Cinquefoil
- Potentilla Robbinsiana Robbins Cinquefoil
[edit] Previously included species
- Potentilla fruticosa now reclassified as Dasiphora fruticosa Shrubby Cinquefoil
[edit] References
Eriksson, T., Hibbs, M. S., Yoder, A. D. Delwiche, C. F. & Donoghue, M. J. (2003). The Phylogeny of Rosoideae. Int. J. Plant Sci. 164(2): 197–211. Available online (pdf file)
