Tetracentron sinense

Tetracentron admin_jmgarg

Tetracentron sinense Oliv., Hooker’s Icon. Pl. 19: t. 1892 (1889) (syn: Tetracentron sinense var. himalense H.Hara & Kanai );
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E. Nepal to Central & S. China: China North-Central, China South-Central, China Southeast, East Himalaya, Myanmar, Nepal, Tibet, Vietnam as per POWO;
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Unidentified plant from Eaglenest, Arunachal Pradesh : 5 posts by 3 authors. Attachments (1)
Please identify this vine photographed on 20 April 2012, Near Alubari, Eaglenest, Arunachal Pradesh, India By Mr Purnendu Roy,

Flowering absent,

Habitat ;- about 1300-1400 asl, subtropical forest typical of Arunachal pradesh, but on northern slope so probably not as high rainfall as typical.
Behalf of Mr Purnendu I am posting this image with his prior permissions, please identify.

Acer sp
Most probably Acer sikkimensis

Interesting. May be … is right but its bit odd that an acer is not trying to develop even some rudimentary palmate features,
too smooth an outline of the few leaves we are seeing.
is it possible to see some more, esp older leaves versus younger leaves?

Does not look like

Plant in picture is Tetracentron sinense
Common in West Kameng region of Arunachal Pradesh and other regions of AP

May be possible as per
https://www.treesandshrubsonline.tetracentron-sinense/
https://en.wikipedia.org/wiki/Tetracentron_sinense
https://www.missouribotanicalgarden.org/PlantFinderDetails

References:
POWO Catalogue of Life
https://www.treesandshrubsonline.org/tetracentron-sinense/
https://en.wikipedia.org/wiki/Tetracentron_sinense
https://www.missouribotanicalgarden.PlantFinderDetails