Id requested? Arunachal Pradesh. 25.12.17 : 6 posts by 3 authors. Attachments (2) – 2 Mb or more.
Looking like garcinia sp.
It was a climber, I suppose.
Does the leaf on the second image belong to the same plant ? Any image of fruit ?
These are female flowers of a species of family Menispermaceae. Please check the woody climbers under this family to narrow down on the genus.
Pycnarrhena pleniflora Hook. fil. & Thoms. may be one possibility as per images herein, the only species reported from E.Himalayas in India.
Inflorescences dont match with those of Pycnarrhaena. These looks like branched racmes while P. pleniflora should have flowers in axillary clusters