Laos, Khammoune prov., Boualapha distr., Ban Dou village, around Khuay cave, at 17°30′35.1″N, 105°51′28.7″E.
Primary dry evergreen and semideciduous broad-leaved forest on very steep rocky slope near karstic hill top composed with solid, marble-like highly eroded limestone at 250-390 m a.s.l.
Terrestrial and lithophytic herb or vine on rocky mountain top. Leaves below purple-violet. Not common.
10 May 2018, L. Averyanov, Khang Sinh Nguyen, T. Maisak, Littideth Xaiyavongsa, Siphanom Keovankham, AL 895.