Begonia acetosella

Begonia acetosella Craib, Bull. Misc. Inform. Kew 1912: 153 1912. (syn: Begonia acetosella var. acetosella ; Begonia tetragona Irmsch.);

China South-Central; East Himalaya; Laos; Myanmar; Thailand; Tibet; Vietnam as per Catalogue of Life;

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MS Aug.,2017/02 Begonia sp. for Id. : 8 posts by 3 authors. Attachments (2)

Location : Kaukam, Mizoram
Date : 08-08-2017
Habit : Herb
Habitat : Wild

Close ups of flowers please 

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Close up flower

Attachments (1)

Begonia nepalensis (A.DC.) Warb. 

Does not match with high resolution specimen of Begonia nepalensis at gbif & others at eol (as the inflorescence in axillary here):

Also does not have range as per
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Same Begonia

Attachments (1)

Hmm on looking at this photo it could be Begonia longifolia Blume, seeing as all the flowers are presenting with 3 styles and not the 4 one would expect of Begonia acetosella.

This is B. acetosella – did you try the key?

The photo is not great, but the species is dioecious and has a 4-locular fruit, so is B. acetosella.
… knows the two species better than I do. I would agree with his identification and these two species can be variable in style and tepal number.