Hoya linearis

What can it be? 

No idea at all. May be Fern sp. ?

It’s Gesneriaceae or one of those things – I just can’t quite remember the name of this easily recognisable spermatophyte genus, sorry.
Can’t find those places on a map – sounds like Sikkim, but please always tell us the State, as I keep saying!

… has suggested it as Hoya linearis and looks like correct.
https://garden.org/plants/view/114258/Hoya-Hoya-linearis/

Hoya!  Yes, that’s right – I keep seeing it but never remember the name.

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Any idea about the family or the genus ?

Seems like species of Vigna radiata wild. Find if the flowers are yellow and is climber

This is not Fabaceae !

It does resemble some Phaseolus.

Such long pods are generally seen in many species of Indigofera, as per comparative images herein.

Hoya linearis Wall. ex D.Don !

So these are leaves and not pods.

Yes

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References:
Catalogue of Life  The Plant List Ver.1.1  Flora of China  Annotated checklist of Flowering plants of Nepal  India Biodiversity Portal  Dave’s Garden Shrubland Park Nurseries  Houzz