American Pondweed
American pondweed is a common name for several aquatic plants, and may refer to: *''Elodea canadensis'', in the family Hydrocharitaceae, with many small leaves on a submerged stem *'' Potamogeton epihydrus'', in the family Potamogetonaceae, and known as "American pondweed" in the British Isles *''Potamogeton nodosus ''Potamogeton nodosus'' is a species of aquatic plant known by the common names longleaf pondweed and Loddon pondweed. It is native to Eurasia and the Americas, where it is widespread and can be found in water bodies such as ponds, lakes, ditch ...

Elodea Canadensis
''Elodea canadensis'' (American waterweed or Canadian waterweed or pondweed) is a perennial aquatic plant, or submergent macrophyte, native to most of North America.Flora of North America''Elodea canadensis''/ref>Plants of British Columbia''Elodea canadensis''/ref>Jepson Flora''Elodea canadensis''/ref> It has been introduced widely to regions outside its native range and was first recorded from the British Isles in about 1836. Distribution The native range of the species lies within North America, but it has been introduced in many parts of the world either intentionally or not. Europe has been particularly affected with the first record dating back as far as 1836. Since then, the species' presence has been confirmed in all continental European countries. Records of the species' presence in Ireland include: County Galway, found at several sites along the Eglinton Canal, County Galway, County Down. and from the Lagan Canal near Lisburn, Northern Ireland. Description Young plant ...
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Potamogeton Epihydrus
''Potamogeton epihydrus'' is a perennial aquatic plant known by the common names ribbonleaf pondweed and Nuttall's pondweed (not to be confused with ''Elodea nuttallii''), and American pondweed in the United Kingdom. It is native to much of North America, where it grows in water bodies such as ponds, lakes, ditches, and slow-moving streams. Description The plant is a perennial rhizomatous herb producing narrow, compressed, unspotted stems, up to a length of about 1 m, which are unbranched or sparingly branched. It has two types of leaf: * Submersed leaves, which are sessile and 5–25 cm long, 0.1–1 cm wide, translucent, linear in shape and ribbonlike, and red-brown to light green in colour, with a blunt to acute tip * Floating leaves, similar to the floating leaves of other ''Potamogeton'', which are petiolate and opaque, and up to 8 centimeters long and 3 wide The inflorescence is a small spike of flowers that arises from the water on a peduncle 1.5–5 (rarely, u ...
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