Comarum palustre (syn. Potentilla palustris), known by the common name marsh cinquefoil,[1][2] also purple marshlocks and swamp cinquefoil, is a waterside rhizomatous subshrub. It has a circumboreal distribution, occurring throughout cool temperate Asia, Europe, and North America, particularly in northern regions. It is most commonly found on lake shores, marshy riversides and stream margins, often partly submerged with foliage floating. It is a parent of some Fragaria–Comarum hybrids, ornamental plants produced by crossing with strawberries.
| Comarum palustre | |
|---|---|
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| Fresh flower with intact stamens; Belgium | |
Scientific classification 
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| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Clade: | Rosids |
| Order: | Rosales |
| Family: | Rosaceae |
| Genus: | Comarum |
| Species: | C. palustre
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| Binomial name | |
| Comarum palustre | |
| Synonyms | |
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Description
editThe stem is green to reddish-brown, finely hairy at first, low sprawling and vine-like, with long trailing stems up to 1.5 m (5 ft) long or more, scrambling over other plants and occasionally reaching a height of 45 cm (1 ft) but usually lower.[1][3] The stems root readily at the base and higher up wherever they are in contact with the ground or water. The leaves are glaucous green with three to seven (mostly five) narrow leaflets 3–6 cm (1–2 in) long with coarsely toothed margins. The flowers are produced in loose clusters at the apex of the stems; they vary from red to purple, and are 20–30 mm (1–1 in) in diameter. They have five (occasionally six) large sepals and five (occasionally six) smaller, darker petals, and a ring of spatula-shaped stamens surrounding the receptacle. Flowering is in late spring to summer, from late May to July.[1] The fruit is like a small dry strawberry.
Cultivation
editMarsh cinquefoil prefers peaty soils but can also grow in moist sandy areas. It flourishes in USDA Zones 3–9.
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Foliage in spring, Czech Republic
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Flower after pollen harvest (with honey bee), Finland
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Dried seed heads with seeds, Shetland, UK
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Stem showing rooting along its length. Quebec, Canada
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References
edit- ^ a b c Streeter D, Hart-Davies C, Hardcastle A, Cole F, Harper L. 2009. Collins Flower Guide. Harper Collins ISBN 9-78-000718389-0
- ^ BSBI List 2007 (xls). Botanical Society of Britain and Ireland. Archived from the original (xls) on 2015-06-26. Retrieved 2014-10-17.
- ^ Blamey, M. & Grey-Wilson, C. 1989. Flora of Britain and Northern Europe. ISBN 0-340-40170-2
External links
edit- Jepson Manual Treatment
- NRCS. "Comarum palustre". PLANTS Database. United States Department of Agriculture (USDA).
- "Comarum palustre". Germplasm Resources Information Network. Agricultural Research Service, United States Department of Agriculture.
- Washington Burke Museum
- Comarum palustre in the CalPhotos photo database, University of California, Berkeley
- Wildflower.org.uk description