Dear Surajit Ji,

I agree with Gurucharn sir's view.

Tubular ochrea with leaf like wings are suggesting this to be Persicaria 
orientalis (L.) Spach

Family: Polygonaceae.

A link for your kind perusal:

http://taiwanacademy.tw/en/archives/item/3817319.html 

Regards,
Ritesh.

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