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). Primary wet evergreen broadleaved forest on very steep rocky slope at 2000 m elev. Climbing shrub with shoots up to 3-4 m lg on open rocky steep slope. Flowers white. Common on open cliffs.
NTH 2879 21-22 May 1999
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)