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.
Coordinates (geographic position):17° 30′ 35.1″ N, 105° 51′ 28.7″ E ±1000 mRecord creation: 2019-01-23, Leonid Averyanov, PhotoScan D1. Processing status: work_status_1Citation: Specimen LE 01049241 // Virtual herbarium of Komarov Botanical Institute RAS — http://re.herbariumle.ru/01049241