Vientiane prov., Vang Vieng distr., Khan Mac village, around point 18°51'26.4''N 102°28'36.7''E.
Secondary broad-leaved deciduous open dry forest with Euphorbia antiquorum on very steep rocky mountain slopes composed by solid marble like highly eroded limestone at elev. 400-500 m a.s.l.
Leafless undershrub 1-2 m tall on open exposed rocks. Flowers light pink. Locally very common.
Record creation: 2021-11-10, Leonid Averyanov, PhotoScan D2Citation: Specimen LE 01089562 // Virtual herbarium of Komarov Botanical Institute RAS — http://re.herbariumle.ru/01089562