Bistorta officinalis ?

Bistorta officinalis Raf., Fl. Auvergne ed. 2, 2: 516 1800. (Syn: Bistorta abbreviata Kom.; Bistorta confusa (Meisn.) Greene; Bistorta ensigera (Juz.) Tzvelev; Bistorta lapidosa Kitag.; Bistorta major Gray; Bistorta major subsp. cordifolia (Turcz.) Soják; Bistorta major subsp. ensigera (Juz.) Soják; Bistorta major var. japonica H.Hara; Bistorta officinalis subsp. japonica (H.Hara) Yonek.; Bistorta paleacea Yonek. & H.Ohashi; Bistorta subauriculata Kom.; Polygonum abbreviatum Kom.; Polygonum alopecuroides subsp. subauriculatum (Petrov ex Kom.) Vorosch.; Polygonum alpestre Schur; Polygonum amoenum Salisb.; Polygonum ampliusculum Gand.; Polygonum bistorta subsp. japonicum (H.Hara) T.Shimizu; Polygonum bistortoides Boiss.; Polygonum bistortum Dulac; Polygonum bourdinii Gand.; Polygonum carthusianorum Gand.; Polygonum confusum Meisn.; Polygonum ensigerum Juz.; Polygonum lapidosum (Kitag.) Kitag.; Polygonum paleaceum Wall. ex Hook.f.; Polygonum pilatense Gand.; Polygonum subauriculatum Petrov ex Kom.);
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Temp. Eurasia, Morocco: Albania, Altay, Amur, Assam, Austria, Baltic States, Belarus, Belgium, Bulgaria, Buryatiya, Central European Rus, China North-Central, China South-Central, China Southeast, Chita, Czechoslovakia, East European Russia, France, Germany, Great Britain, Greece, Hungary, Inner Mongolia, Iran, Iraq, Irkutsk, Italy, Japan, Khabarovsk, Korea, Krasnoyarsk, Krym, Morocco, Netherlands, North Caucasus, North European Russi, Northwest European R, Pakistan, Poland, Portugal, Primorye, Qinghai, Romania, South European Russi, Spain, Switzerland, Tibet, Transcaucasus, Turkey, Tuva, Ukraine, West Himalaya, West Siberia, Yakutskiya, Yugoslavia as per POWO;
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For ID- SP1- 271112:
Please help me to identify this flower.
Location – Cherapunji
Date: May 2010
Habitat- Wild

Bistorta spp, leaves and Habit is require to tell species.

Bistorta officinalis is possible from the area, as per POWO, Wikimedia Commons,

Bur leaves and details are required for confirmation.

Bistorta officinalis looks incorrect to my experience – for example it has light anthers and the page’s photo they are dark

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