Lobelia terminalis

Clarke ; pubescent, ascending, leaves short-petioled ovate upper narrower sharply toothed almost bracteiform, pedicels very long slender.
North Bengal ; near the foot of the hills ; Bhyadanga in Mymensingh, Clarke.
A slender, suberect, annual, 6-10 in., branching, not rooting. Leaves 1/4-3/4 in. diam., denticulate ; upper oblong, incised. Pedicels, mostly from the upper axils, 3-5 times as long as the bractiform leaves, so that the inflorescence appears as a lax terminal corymb. Corolla 1/6 in. Capsule 1/6 by 1/8 in., not tapering to the pedicel. Seeds sub-spherical, distinctly trigonous –
See more at: flora.biotain
(From The Flora of British India (1881) from IBIS Flora)
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ID of herb from Assam KD 03 Feb 2015 : 6 posts by 4 authors. Attachments (6)

Viola sp.

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

I do not think it’s a Viola despite the leaf shape.

This is Lobelia, but species level id is difficult, pictures are not clear except the flower, and no statistics available to determine. ID is not done this way.
One Lobelia zeylanica L. is similar looking, not the one in our database, search the net for other pics.
Since pedicel is long and leaves subsessile it is more likely Lobelia terminalis C. B. Clarke.

Thanks, … for beautiful images. Pl. check Lobelia

Lobelia terminalis C.B.Clarke as per images herein.

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References:
The Plant List Ver.1.1  WCSP  Flora of China  FOC illustration  WFO Kew  IBIS Flora