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.LA-VN 1872 28 March 2017