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 slopes at 1600 m elev. Terrestrial and lithophyte forb on steep slopes and rocky cliffs. Flowers white. Very common at elev. 1600-2300 m.
NTH 2671 21-22 May 1999
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)