Northern Vietnam, Lao Cai Prov., Van Ban Distr., to the west of Nam Xay village (21°58′42′'N, 104°00′37′'E). Primary evergreen broad-leaved montane wet forest (on granite and quartzite) with bamboo on lower part of slope along small rocky stream at elev. 1650 m a.s.l. Lithophytic herb on mossy rocks of stream slope. Flowers white. Common. Usual co-dominant of herb stratum in lithophytic herb community on wet stream rocks.