N. Vietnam, prov. Lao Cai, distr. Than Uyen, municipality Ho Mit (N 22°06′ E 103°52′). Elevation to Mang Han San quartzite peak by SW slope from Ban Thao village (SSW macroslope of Hoang Lien Son ridge). Secondary open forest on steep rocky slope at 1300-1400 m elev. Climbing shrub with shoots 1.5-2.5 m hg. Flowers white. Very common on open places on steep slopes and bluffs.
NTH 2690 21-22 May 1999
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)