Calanthe whiteana

Calanthe whiteana King & Pantl., J. Asiat. Soc. Bengal, Pt. 2, Nat. Hist. 65: 121 (1896) (syn: Calanthe wardii W.W.Sm.);
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Sikkim to China (N. & SW. Sichuan) and N. Indo-China: Assam, Bangladesh, China South-Central, East Himalaya, Myanmar, Vietnam as per POWO;
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Common name: Green Calanthe
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Images and details from Jambey Tsering ji:

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References:
POWO  Catalogue of Life  Flowers of India