Apetalanthe gracilis

Apetalanthe gracilis Aver. & Vuong, Taiwania 65: 479 (2020) (syn: Ponerorchis nanoides Schuit. & X.H.Jin);
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Vietnam as per POWO;
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Common name: Graceful Petalless Orchid
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Images and details from Jambey Tsering ji:

References:
POWO  Catalogue of Life  Flowers of India