Luang Prabang prov., Ngoy distr., Ngoy village, around point 20°42′52.9′'N 102°41′15.5′'E.
Remnants of primary evergreen forest on very steep rocky mountain slopes composed by solid marble like highly eroded limestone at elev. 800-900 m a.s.l.
Terrestrial herb or undershrub 1-1.5 m tall in open place. Flowers white. Occasional.