Kham Mouan Prov., Bounlapha Distr., Thong Sam village, Hinnam No Protected Area, Pu Pha Song Mt. composed by sandstone, around point 17°35′13.2”N 105°47′49.8”E.
Primary and secondary evergreen broad-leaved and mixed forest on W macroslope at elevation from 500 m to the mountain top elevated to 1425 m.
Undershrub 1.5 m tall in shady wet place along stream rocks. Flowers blue. Common at elevation 1000 m.