N. Vietnam, Tuyen Quang prov., Na Hang distr., Thanh Tuong municipality, near Ban Bung village (22°16′26′'N, 105°25′58′'E). Primary broad-leaved evergreen wet forest on very steep limestone/shale slope of mountain stream canyon at elev. 300-450 m a.s.l. Terrestrial herb up to 0.5 m hg on steep slope. Very common. Usual codominante of herb forest stratum.