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Location: Kalimpong, WB, India
Date: 15 May 2018
Altitude: 4100 ft.
Habit : Cultivated
May be as per Ornithogalum umbellatum L.
This looks like Chincherinchee (Ornithogalum thyrsoides)
http://www.theflowerbulbcompany.co.uk/shop/ornithogalum-thrysoides-chincherinchee/
http://www.theflowerbulbcompany.co.uk/shop/ornithogalum-thrysoides-chincherinchee/
I guess it is not Chincherinchee looking at the thin stem and leaves compared to Chincherinchee.
I guess it is Ornithogalum umbellatum L. which is already included in the efi !
Ornithogalum umbellatum L.
Ornithogalum umbellatum L.
I think it is different from Ornithogalum even in the family. Your plant looks like belonging to Onion family. It does look similar to Allium tuberosum, but the flowers are too few in the umbel. I have a feeling it is an Allium species.
Please see the red circles, one from my image and the other from POWO. In net images also numbers flowers are less in the umbel compared to Ornithogalum thyrsoides !
Ornithogalum umbellatum L.
https://www.plantwild.co.uk/product/star-of-bethlehem/