Laos, Khammouane prov., Boualapha distr., Nong Seng village, southern sandstone slopes at summit of Phou Chuang (Poujeuang) Mt. around point 17°35′00.3″N, 105°47′35.6″E.
Primary evergreen mixed and coniferous dense wind-formed forest at elev. 1000-1400 m a.s.l.
Lithophytic rosulate herb on vertical mossy cliffs. Leaves uniform green. Locally common, particularly at elevations 1200-1400 m.
4 May 2018, L. Averyanov, Khang Sinh Nguyen, T. Maisak, Littideth Xaiyavongsa, Siphanom Keovankham, AL 677.
Flowered in 10 Sept 2018. Median sepal white, heavily purple spotted in apical part, dark purple in basal half, lateral sepals light brown with darker nerves, lip yellow-brownish, staminode yellow and synsepalum pale yellow. Photos L. Averyanov.