There was other thread https://groups.google.com/forum/?fromgroups#!topicsearchin/indiantreepix/group:indiantreepix$20AND$20Impatiens$20AND$20racemulosa/indiantreepix/CA0u-h0RNeE with at least similar plant. The same person (Mithilesh K Pathak) gave the same identification. Distribution pattern from literature (eastern Himalayas, Assam, Meghalaya...) and and general description (flowers violet, spur incurved) is in agreement with data given by both authors of relevant posts and this what is visible on the photo - we most probably have Impatiens racemulosa Wall. ex Hooker f. et Thomson! Wojciech
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