FLORA OF VIETNAM Poaceae (Bambusoideae) Northern Vietnam, Lao Cai Prov., Van Ban Distr., to the west of Nam Xay village (around point 21°58′09′'N, 104°00′55′'E). Primary broad-leaved evergreen wet montane forest on granite and quartzite along stream canyon at elev. 1750-1800 m a.s.l. Woody grass about 2 m hg on steep stream slope. Very common. Usual co-dominant on steep open slopes (occasionally monodominant).