N.Vietnam, Cao Bang Prov., Trung Khanh Distr., Ngoc Khe Municipality, Pac Nga village, around point 22є54'59''N, 106є31'44''E, at elevation 800-850 m a.s.l. Remnants of primary broad-leaved evergreen and coniferous forest along rocky tops of rocky ridges and mesae composed with light gray solid marble-like highly eroded crystalline limestone.
Herbaceous or hemiwoody vine 4-6 m long. Flowers white. Occasional.
Record creation: 2026-02-26, Galina Savich, PhotoScan D2Citation: Specimen LE 01318925 // Virtual herbarium of Komarov Botanical Institute RAS — http://re.herbariumle.ru/01318925