N. Vietnam, Thanh Hoa prov., Ba Thuoc distr., Co Lung municipality, territory of Pu Luong protected area, near Co Lung village (20º27'28''N, 105º12'18''E). Primary broad-leaved evergreen forest on slope of remnant highly eroded karst limestone ridge at elev. 500 m a.s.l. Terrestrial herb on steep open clay slope. Flowers: tepals light green, lip white with purple-violet sidelobes and apex. Rare.
Record creation: 2021-02-28, Аверьянов Леонид ВладимировичCitation: Specimen LE 01090133 // Virtual herbarium of Komarov Botanical Institute RAS — http://re.herbariumle.ru/01090133