Polygonum oxyspermum
| Polygonum oxyspermum | |
|---|---|
| File:Polygonum oxyspermum cayeux-sur-mer 80 17092006 1.JPG | |
| Scientific classification Edit this classification | |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Order: | Caryophyllales |
| Family: | Polygonaceae |
| Genus: | Polygonum |
| Species: | P. oxyspermum
|
| Binomial name | |
| Polygonum oxyspermum | |
| Synonyms[1] | |
| |
Polygonum oxyspermum is a coastal species of flowering plant in the buckwheat family. It is native to Europe, primarily along the shores of the Atlantic, the North Sea, and the Baltic Sea, from France and Ireland to Finland and Russia.[2] It is also naturalized in eastern Canada and in the US State of Maine.[3][4]
Description
[edit | edit source]Polygonum oxyspermum is green or blue-green. Annual, stems prostrate, generally run along the surface of the ground but sometimes do rise above ground level. They can be as much as 100 cm (39 in) long. Leaves are up to 35 mm (1.4 in) long. Flowers are green, white or pink,[5] in axillary clusters.[6]
- Subspecies
Three subspecies are widely recognized, although some authors prefer to regard them as distinct species.[1]
- Polygonum oxyspermum subsp. oxyspermum – northern Europe; naturalized in Nova Scotia[7]
- Polygonum oxyspermum subsp. raii (Bab.) D.A.Webb & Chater northern Europe; naturalized in Nova Scotia, Prince Edward Island, New Brunswick, Québec, Maine, Newfoundland[8]
- Polygonum oxyspermum subsp. robertii (Loisel.) Akeroyd & D.A.Webb – Italy[9]
References
[edit | edit source]- ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value). Note that this website has been superseded by World Flora Online
- ^ Online Atlas of the British and Irish flora, Polygonum oxyspermum (Ray`s Knotgrass)
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Wilde Planten in Nederland en België, Zandvarkensgras in Dutch with photos and global distribution map
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Parnell, J. and Curtis, T. 2012. Webb's An Irish Flora. Cork University Press. Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
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- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Acta Plantarum, Polygonum robertii Loisel. – Poligono di Robert
External links
[edit | edit source]- A Photo Flora, Polygonum oxyspermum – Ray's Knotgrass (Polygonaceae Images) photos
- Flora of Northern Ireland
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