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.
Woody vine on mossy cliff on rocky mountain top. Flowers dark red to reddish brown buds dull yellowish. Not common.