Yes, I think Kishanlal ji is right. This looks like Aconogonon rumicifolium (Royle ex Bab.) H. Hara to me too.
Family: Polygonaceae Flwoers of India link for comparison: http://www.flowersofindia.net/catalog/slides/Dock-Leaf%20Knotweed.jpg Regards, Ritesh. --
