Saravan Prov., Sa Mouay Distr., to the SEE of Sa Mouay town, elevation from Ta Oy village (700 m elev.) to mountain ridge with highest point at 1350 m around 16°08′47.0”N 106°52′35.4”E.
Secondary evergreen broad-leaved forest on slopes composed with silicate rocks.
Terrestrial herb 2-2.5 m tall in shady place along ridge slopes at elevation 800-1100 m. Flowers brightly red. Very common.