Juglans sigillata Dode, Bull. Soc. Bot. France 2: 94 1906. ;
Id of the plant in Sikkim pl
Looks like Engelhardia spicata to me.
I think Engelhardtia spicata Lechen ex Blume in budding stage (Juglandaceae)
Looks like Juglans regia Linn
Yes, good point, it is more likely Juglans, but it is not J. regia (too many leaflets), rather J. sigillata which I have found common in NE India and N Myanmar.