FLORA OF VIETNAM Asclepiadaceae Cynanchum corymbosum Wight
Northern Vietnam, Lao Cai Prov., Van Ban Distr., Khanh Yen Ha municipality, to the S of Na Nheo village (in the vicinity of point 21°59′04′'N, 104°15′08′'E). Primary closed broad-leaved evergreen wet forest on steep granite and quartzite slopes of stream canyon at elev. 900-1150 m a.s.l. Herb vine about 10 m lg in open place. Rare.