Vientiane Prov., Kasi Distr., Thong Mout village, around point 19°25′19.7”N 102°08′32.7”E.
Primary broad-leaved evergreen forest on very steep slopes and on cliffs of remnant mountain composed with solid crystalline highly eroded limestone at elevation about 1550 m.
Lithophytic adpressed creeping herb on vertical shady cliff. Leaves white spotted. Very common near mountain top.