N. Vietnam, Hoa Binh prov., Da Bac distr., near Doan Ket village (20°54′58′'N, 105°03′51′'E). Secondary open broad-leaved evergreen forest along small river at elev. about 650 m a.s.l. Herb up to 1 m hg on wet places along river. Leaves deep green above, light green below. Flowers orange-yellow with deep purple-brown. Very common.