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.
Record creation: 2026-03-14, Аверьянов Леонид ВладимировичCitation: Specimen LE 01203985 // Virtual herbarium of Komarov Botanical Institute RAS — http://re.herbariumle.ru/01203985