Hoa Binh Prov., Lac Son Distr., Ngoc Son Municipality, Khu village, around point 20°26’31”N 105°19’32”E. Primary broadleaved forest on steep rocky slopes of remnant mountain composed with solid crystalline highly eroded limestone at elevation about 550-650 m a.s.l.
Herbaceous vine to 6 m long on rather open rocky slope. Flowers purple-violet. Locally common.
Record creation: 2026-03-19, Galina Savich, PhotoScan D2Citation: Specimen LE 01317462 // Virtual herbarium of Komarov Botanical Institute RAS — http://re.herbariumle.ru/01317462