Vientiane Prov., Kasi Distr., Thong Mout village, around point 19°26′51.5”N 102°07′45.8”E.
Primary broad-leaved evergreen forest on very steep rocky slopes and on vertical cliffs of remnant highly eroded rocky limestone mountains composed by solid crystalline stratified limestone at elevation 1550-1650 m.
Lithophytic herb on rocky slope. Leaves dark brownish-purple. Flowers yellow-greenish of 5 petals, anthers 5 yellowish. Common near mountain top.