Quang Binh Prov., Minh Hoa Distr., Thuong Hoa municipality, around point 17°41′28”N 105°53′42.7”E.
Primary closed evergreen broad-leaved forest on middle part of slope of remnant mountain composed with solid crystalline limestone at elevation about 650 m a.s.l.
Woody vine to 20 m long, and to 5 cm in diam. Fruits green. Common on mountain top.