Laos, Khammouane prov., Boualapha distr., Nong Seng village, southern sandstone slopes at summit of Phou Chuang (Poujeuang) Mt. around point 17°35′18.1″N, 105°47′47.5″E.
Primary evergreen mixed and coniferous dense wind-formed forest at elev. 1000-1400 m a.s.l.
Shrub 2-3 m tall on mountain top. Flowers white, with light red marks. Very common.
5 May 2018, L. Averyanov, Khang Sinh Nguyen, T. Maisak, Littideth Xaiyavongsa, Siphanom Keovankham, AL 642c.