Dendrobium fugax

Himalaya to Indo-China as per WCSP;

Assam; East Himalaya; Myanmar; Nepal; Thailand; Vietnam; West Himalaya as per Catalogue of Life;
SK1318 25 JUL 2018 : 3 posts by 2 authors. Attachments (7)- around 600 kb each. 
Location : Thapathali, Kathmandu,Nepal
Elevation : 4000 ft.
Date : 20 June 2018
Habit : Collected from wild 

This looks like Flickingeria fugax to me. Now they call it Dendrobium fugax. This plant flowers once a year in normal condition and one flower opens just for few hour.
Thanks a lot for sharing.

Initially I was of the same opinion but I find images slight different in the web and books than my images.