|Scientific Name:||Potamogeton polygonifolius Pourr.|
Potamogeton microcarpus Boiss. & Reut.
Potamogeton oblongus Viv.
|Taxonomic Notes:||Assumed eastward distribution of P. polygonifolius in Asia can be attributed to confusion with P. distinctus. Assumed southern Hemisphere distribution is due to confusion with southern species like P. suboblongus, P. cheesemanii, P. parmatus, and P. stenostachys. The occurrence in these areas has not yet been proved (Wiegleb and Kaplan 1998). P. polygonifolius is closely related to P. coloratus and P. suboblongus.
P. polygonifolius has been shown to hybridise with P. alpinus (P. ×spathulatus Schrad. ex W. D. J. Koch), P. berchtoldii (P. ×rivularis Gillot), P. gramineus (P. ×lanceolatifolius (Tiselius) C. D. Preston), and P. natans (P. ×gessnacensis G. Fisch.).
|Red List Category & Criteria:||Least Concern ver 3.1|
The species is widespread and while it is possibly declining in parts of its range, it is not thought that any global population decline is likely to meet (or be close to meeting) the threshold for Vulnerable. Therefore the species is assessed as Least Concern.
|Range Description:||The species is found primarily in Europe, northern Africa, and the Azores as well as in disjunct locations in Newfoundland, Nova Scotia and St. Pierre & Miquelon in Canada (NatureServe 2014).|
Native:Algeria; Andorra; Austria; Belgium; Canada (Newfoundland I, Nova Scotia); Denmark; Estonia; Finland; France; Germany; Greece; India (Assam); Italy (Italy (mainland), Sicilia); Latvia; Lithuania; Luxembourg; Macedonia, the former Yugoslav Republic of; Malta; Monaco; Morocco; Netherlands; Norway; Poland; Portugal (Azores, Madeira, Portugal (mainland)); Spain; Sweden; Switzerland; Tunisia; United Kingdom; United States (New Jersey)
Introduced:Saint Pierre and Miquelon
|Range Map:||Click here to open the map viewer and explore range.|
|Population:||The species is classed as globally 'Secure' by NatureServe (2014), however the populations in Canada are classed as 'Critically Imperiled' to 'Vulnerable'. The Canadian Endangered Species Conservation Council (CESCC 2011) also class the species as 'Secure' (for Canada only).|
|Current Population Trend:||Unknown|
|Habitat and Ecology:||The species grows in acid to neutral waters of ponds, lakes, and occasionally streams (Flora of North America Editorial Committee 1993+).|
|Use and Trade:||There is no information on the use or trade of this species.|
|Major Threat(s):||The threats to the species are unknown.|
|Conservation Actions:||No conservation actions for the species are known. More information would be useful on the species' population status and threats across its range.|
|Citation:||Maiz-Tome, L. 2016. Potamogeton polygonifolius. The IUCN Red List of Threatened Species 2016: e.T164496A78457142.Downloaded on 17 December 2017.|
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