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 evergreen broad-leaved and mixed forest on W macroslope at elevation from 500 m to the mountain top elevated to 1425 m. Terrestrial herb in shady places. Flowers white, anther yellow. Very common at elevations 1300-1425 m.