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 1900-2000 m elev. Lithophyte creeping vine 1.5-2 m lg on mossy trees in shady canyon. Common.
NTH 2861 21-22 May 1999
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)