Thanks for the lead Dinesh Sir, I think my plant could be Linderbergia grandiflora
Concluded after browsing through the following links. http://www.efloras.org/florataxon.aspx?flora_id=2&taxon_id=200020712 http://www.geocities.jp/takehana056138/Flower/flower_pokhara.html Further comments are awaited. Regards, Ritesh.

