Quang Binh Prov., Minh Hoa Distr., Thuong Hoa municipality, around point 17°43’31.6”N 105°53’38.0”E. Primary closed evergreen broad-leaved humid forest on leveled flat terrace of stream valley composed with solid highly eroded crystalline limestone at elevation about 458 m a.s.l. Woody vine to 4 m long. Flowers white. Not common.