Vientiane prov., Vang Vieng district, close vicinities of Vang Vien town, Phu Ngeum Mt., secondary degraded evergreen forest on steep rocky slopes and cliffs composed with karstic highly eroded marble-like limestone at elevation at 350-500 m a.s.l. Creeping epiphyte on mossy gnarled tree on mountain top. Flower buds dark brown. Occasional.
13 December 2015, L.Averyanov, T.Maisak, M.Nuraliev, N.Vislobokov, AL 203a.
Vientiane prov., Kasi distr., Si Sang Vone village, around point 19°06'10.9''N 102°10'46.1''E. Secondary and primary evergreen dry forest on very steep rocky mountain slopes composed by solid marble like highly eroded limestone at elev. 600-750 m a.s.l. Clustering lithophyte and occasionally epiphyte on rocky mossy mountain top. Flowers bright yellow, fragrant. Not rare.