Vietnam, Thua Thien – Hue Prov., Nam Dong Distr., Huong Son Municipality, around point 16°10'22''N, 107°36'24''E. Fractionally logged primary closed broad-leaved evergreen lowland forest along La Ma River on very steep hill slopes composed with clayey shale and sandstone at elevation about 300 m a.s.l. Woody vine with milky juice about 10 m long along rocky stream valley. Flower buds white. Not common.
Record creation: 2026-10-19, Аверьянов Леонид ВладимировичCitation: Specimen LE 01360722 // Virtual herbarium of Komarov Botanical Institute RAS — http://re.herbariumle.ru/01360722