Persicaria sagittata

Persicaria sagittata (L.) H.Gross, Beih. Bot. Centralbl. 37(2): 113 1919. (Syn: Helxine sagittatum (L.) Raf.; Persicaria sagittata var. sieboldii (Meisn.) Nakai; Persicaria sieboldii (Meisn.) Ohki; Persicaria sieboldii var. brevifolia Kitag.; Polygonum belophyllum Litv.; Polygonum paludosum (Kom.) Kom.; Polygonum sagittatum L.; Polygonum sagittatum var. boreale Meisn.; Polygonum sagittatum var. gracilentum Fernald; Polygonum sagittatum var. paludosum Kom.; Polygonum sagittatum var. sibiricum Meisn.; Polygonum sagittatum var. sieboldii (Meisn.) Maxim. ex Kom.; Polygonum sagittatum subsp. sieboldii (Meisn.) Vorosch.; Polygonum sieboldii Meisn.; Polygonum sieboldii var. pratense Y.L. Chang & S.X. Li; Tasoba sagittata (L.) Raf.; Tracaulon sagittatum (L.) Small; Tracaulon sibiricum (Meisn.) Greene; Tracaulon sieboldii (Meisn.) Greene; Truellum paludosum Soják; Truellum sagittatum (L.) Soják; Truellum sibiricum (Meisn.) Soják; Truellum sieboldii Soják);
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Siberia to Himalaya and Temp. E. Asia, Central & E. Canada to Central & E. U.S.A., Hispaniola: Alabama, Altay, Amur, Arkansas, Assam, Buryatiya, China North-Central, China South-Central, China Southeast, Chita, Colorado, Connecticut, Delaware, District of Columbia, Dominican Republic, East Himalaya, Florida, Georgia, Illinois, Indiana, Inner Mongolia, Iowa, Irkutsk, Japan, Kansas, Kentucky, Khabarovsk, Korea, Krasnoyarsk, Kuril Is., Louisiana, Maine, Manchuria, Manitoba, Maryland, Massachusetts, Michigan, Minnesota, Mississippi, Missouri, Mongolia, Nebraska, Nepal, New Brunswick, New Hampshire, New Jersey, New York, Newfoundland, North Carolina, North Dakota, Nova Scotia, Ohio, Oklahoma, Ontario, Pennsylvania, Primorye, Prince Edward I., Québec, Rhode I., Sakhalin, South Carolina, South Dakota, Taiwan, Tennessee, Texas, Vermont, Virginia, West Himalaya, West Siberia, West Virginia, Wisconsin as per POWO;
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Persicaria sagittata, common names American tearthumb, arrowleaf tearthumb, or arrowvine, is a plant species widespread in the eastern half of North America as well as in eastern Asia. It is known from every state and province from Texas to Manitoba to Newfoundland to Florida, plus Colorado and Oregon. It is also reported from China, the Russian Far East, Siberia, Korea, Japan, northern India and Mongolia.
It grows in moist areas along lake shores, stream banks, etc.^[2][3]Persicaria sagittata is an annual herb up to 200 cm tall, with prickles along the stem. Leaves are up to 10 cm long, heart-shaped or arrowhead-shaped (unusual for the genus). Flowers are white to pink, borne in in spherical to elongated clusters up to 15 mm long. ^[2][4][5]
(From Wikipedia on 28.5.14)
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References:
The Plant List Ver.1.1  GRIN  Flora of North America  Annotated checklist of Flowering plants of Nepal  Wikipedia