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 1500-1600 m elev. Terrestrial and lithophyte forb up to- 0.3 m hg on shady wet cliffs along stream and waterfall sides. Flowers white. Very common.
NTH 2669 21-22 May 1999
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)