Luang Prabang prov., Ngoy distr., Nong Khiew village, Pha Deng Mountain around point 20°34'14.3''N 102°37'31.8''E.
Secondary semideciduous and evergreen dry forest on very steep rocky mountain slopes composed by solid marble like highly eroded limestone at elev. 700-825 m a.s.l. Tree 8-10 m tall on rocky mossy mountain top. Flowers bright yellow. Not rare.