Houphan Prov., Viengxay Distr., Xieng Luong village, around point 20°22'06.1"N 104°17'18.6"E. Primary and secondary broad-leaved evergreen dry forest on very steep rocky slopes of highly eroded mountains composed by solid marble-like limestone at elev. 600-700 m a.s.l. Creeping epiphyte on small mossy tree in shady place on mountain top. Flowers white, apices of tepals and petals purple-violet, lip dark purple-violet, column and anther white. Not common. LA-VN 1157 8 April 2015 photos. Coll.: N.T.Hiep, L.Averyanov, N.S.Khang, N.Q.Hieu, T.Maisak, Somneuk Bouthamounty.
Coordinates (geographic position):20° 22′ 6.1″ N, 104° 17′ 18.6″ E ±1000 mRecord creation: 2019-06-21, Leonid Averyanov, PhotoScan D1. Processing status: work_status_1Citation: Specimen LE 01055438 // Virtual herbarium of Komarov Botanical Institute RAS — http://re.herbariumle.ru/01055438