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Persicaria amphibia
''Persicaria amphibia'' (syn. ''Polygonum amphibium'') is a species of flowering plant in the knotweed family known by several common names, including longroot smartweed, water knotweed, water smartweed, and amphibious bistort. It is native to much of North America, Asia, Europe, and parts of Africa,〔(''Persicaria amphibia''. ) Germplasm Resources Information Network (GRIN).〕 and it is known elsewhere as an introduced species and sometimes a noxious weed.
==Distribution==
''Persicaria amphibia'' grows in many types of wet habitat, such as ponds, streams, and marshes. It is a rhizomatous perennial herb which takes a variety of forms and is quite variable in morphology. It may be an aquatic plant, growing submerged or floating in water bodies, it may grow in muddy and wet areas which are periodically inundated, and it may grow in moist spots on land, such as in meadows.
Dry-land and fully aquatic plants are sometimes considered different named varieties of the species.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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