Fallopia convolvulus

Fallopia convolvulus (L.) A. Löve, Taxon 19: 200 1970. (syn: Bilderdykia convolvulus (L.) Dumort.; Bilderdykia convolvulus var. pumilio Lunell; Fagopyrum carinatum Moench; Fagopyrum convolvulus (L.) Gross; Fagopyrum volubile Gilib.; Fallopia convolvulus var. subalatum (Lej. & Courtois) D.H.Kent; Helxine convolvulus (L.) Raf.; Polygonum convolvulaceum Lam.; Polygonum convolvuliforme St.-Lag.; Polygonum convolvulus L.; Polygonum convolvulus var. cristatum Kuntze; Polygonum convolvulus var. erectum Farw.; Polygonum convolvulus f. glabrum Kuntze; Polygonum convolvulus f. puberulum Kuntze; Polygonum convolvulus f. pubescens Kuntze; Polygonum infestum Salisb.; Polygonum striatum Dulac; Reynoutria convolvulus (L.) Shinners; Tiniaria convolvulus (L.) Webb & Moq.);
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Macaronesia to N. Africa, Temp. Eurasia: Afghanistan, Albania, Algeria, Altay, Amur, Austria, Azores, Baleares, Baltic States, Belarus, Belgium, Bulgaria, Buryatiya, Canary Is., Central European Rus, China North-Central, China South-Central, China Southeast, Chita, Corse, Cyprus, Czechoslovakia, Denmark, East Aegean Is., East European Russia, East Himalaya, Egypt, Finland, France, Føroyar, Germany, Greece, Hungary, India, Inner Mongolia, Iran, Iraq, Irkutsk, Italy, Kamchatka, Kazakhstan, Khabarovsk, Kirgizstan, Korea, Krasnoyarsk, Kriti, Krym, Kuril Is., Lebanon-Syria, Libya, Madeira, Magadan, Manchuria, Mongolia, Morocco, Nepal, Netherlands, North Caucasus, North European Russi, Northwest European R, Norway, Pakistan, Panamá, Poland, Portugal, Primorye, Qinghai, Romania, Sakhalin, Sardegna, Sicilia, South European Russi, Spain, Sweden, Switzerland, Tadzhikistan, Tibet, Transcaucasus, Tunisia, Turkey, Turkey-in-Europe, Turkmenistan, Tuva, Ukraine, Uzbekistan, Vietnam, West Himalaya, West Siberia, Xinjiang, Yakutskiya, Yugoslavia; Introduced into: Alabama, Alaska, Alberta, Aleutian Is., Argentina Northeast, Argentina Northwest, Argentina South, Arizona, Arkansas, Bermuda, Bolivia, Brazil South, Brazil Southeast, British Columbia, California, Cape Provinces, Chile Central, Chile South, Colorado, Connecticut, Cuba, Delaware, District of Columbia, Dominican Republic, Ethiopia, Florida, Free State, Georgia, Great Britain, Greenland, Hawaii, Iceland, Idaho, Illinois, Indiana, Iowa, Ireland, Japan, Kansas, Kentucky, Kenya, Labrador, Lesotho, Louisiana, Maine, Manitoba, Maryland, Massachusetts, Michigan, Minnesota, Mississippi, Missouri, Montana, Mozambique, Nansei-shoto, Nebraska, Nevada, New Brunswick, New Caledonia, New Hampshire, New Jersey, New Mexico, New York, New Zealand North, Newfoundland, Norfolk Is., North Carolina, North Dakota, Northern Provinces, Nova Scotia, Ohio, Oklahoma, Ontario, Oregon, Palestine, Paraguay, Pennsylvania, Peru, Prince Edward I., Québec, Rhode I., Saskatchewan, South Carolina, South Dakota, Svalbard, Taiwan, Tennessee, Texas, Utah, Vermont, Virginia, Washington, West Virginia, Wisconsin, Wyoming, Yukon as per POWO;
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Plant ID_KARGIL : 8 posts by 5 authors. Attachments (2)

Axillary cluster of pedicellate flowers, opposite leaves indicate possibility of some Cynanthum/ Vincetoxicum species (Asclepiadaceae).

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To me, it looks like a Fallopia sp. (Polygonaceae). Pl check

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… is probably more closer to the correct ID. I suggested Asclepiadaceae based on opposite leaves. In first picture leaves look alternate. May now be searched in Fallopia sp.

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Fallopia species in eFloraofindia (with details/ keys from published papers/ regional floras/ FRLHT/ FOI/ Biotik/ efloras/ books etc., where ever available on net)  

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This appears to be Fallopia convolvulus as per images and illustration at Wikipedia, Wikitionary, FoP and FoC

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Yes

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References:
POWO  Catalogue of Life  The Plant List Ver.1.1  IPNI  BSI Flora of India Checklist  Flora of China  FOC illustration  Flora of Pakistan  FOP illustration Annotated checklist of Flowering plants of Nepal  India Biodiversity Portal  Wikipedia  Wikitionary