Luang Prabang prov., Pon Xay distr., Houay Man village, Phou Tham Keo Mountain, around point 19°57′44.2′'N 102°25′45.8′'E.
Degraded primary evergreen and semideciduous forest on very steep rocky mountain slopes composed by solid marble like highly eroded limestone at elev. 500-650 m a.s.l.
Terrestrial prostrate herb on open grassland. Inflorescences dirty violet. Common weed.