Cymbidium eburneum Lindl., Edwards’s Bot. Reg. 33: t. 67 1847. (Syn: Cymbidium eburneum var. longzhouense Z.J.Liu & S.C.Chen; Cymbidium eburneum var. philbrickianum Rchb.f.; Cymbidium eburneum var. williamsianum Rchb.f.; Cymbidium syringodorum Griff.; Cyperorchis eburnea (Lindl.) Schltr.);
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Himalaya to Hainan: Assam, China South-Central, China Southeast, East Himalaya, Hainan, Myanmar, Nepal, Vietnam as per POWO;
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Common name: Ivory Cymbidium
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Cymbidium eburneum Lindley. is a remarkably handsome evergreen species, one of the finest of the genus. It is of very compact growth, forming graceful tufts of distichous linear-lorate foliage. The spike is erect, about 9 to 12 inches high, the flowers very large and fragrant, with pure white sepals and petals, and a lip of the same colour, with a crispy front lobe, and having a bold band of yellow in the centre, behind which is a long yellow fleshy pubescent crest. It blooms in February and March, and lasts a long time in perfection. …
(From Wikipedia  on 31.7.14)
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Orchids from Sikkim-Darjeeling Tour- For validation from LBG:: NS July 16 : 2 posts by 2 authors. Attachments (3).
This was also growing in LBG, I could not find the label, tried to identify myself by this, and my opinion leads towards Cymbidum eburneum..
Please suggest..

Yes this could either be Cymbidium eburneum or a hybrid of same. It looks slightly different from the true eburneum.