It is Uncaria sp.
My post from Gori Valley was identified as Uncaria sessilifructus..
Uncaria sessilifructus is reported from Manipur.
Also check Uncaria scandens (Sm.) Hutch.
|9 (8)||Leaf blade not glaucous abaxially, with tertiary venation mostly reticulate and not strongly scalariform on adaxial surface; peduncles simple; corolla lobes externally glabrous; fruit 6-8 mm.||3 U. laevigata|
|+||Leaf blade often glaucous abaxially, with tertiary venation rather evidently scalariform at least on adaxial surface; peduncles simple or often branched; corolla lobes externally sericeous; fruit 10-14 mm.||10 U. sessilifructus|
You have to examine closely these with the original images, to come to the conclusion.
Thank you … for pointing out this herbarium specimen from Manipur! Yes, it agrees well.