Vietnam, Thua Thien – Hue Prov., Nam Dong Distr., Huong Son Municipality, around point 16°09'52''N, 107°36'22''E (around plot 16°09'36''N, 107°36'10''E). Heavily logged primary closed broad-leaved evergreen lowland forest along La Ma River on very steep hill slopes composed with clayey shale at elevation about 300-450 m a.s.l. Woody vine about 10 m long. Syconia brightly red. Not common.