Saravan Prov., Sa Mouay Distr., to the SEE of Sa Mouay town, elevation from Ta Oy village to mountain ridge with highest point at 1350 m around 16°08′47.0”N 106°52′35.4”E.
Primary evergreen humid mixed and coniferous forest on slopes composed with silicate rocks.
Lithophytic herb in shady wet place along stream near mountain top at elevation 1200-1350 m. Flowers white, anthers yellow. Common.