N. Vietnam, Bac Can prov., Na Ri distr., Kim Hy municipality, vicinities of Lung Hin Con village (N 22°17′ E 106°03′), 27 km to 55° of Bac Can city. Secondary shrubs on alluvial shale foothills of limestone ridge at elev. 500-550 m a.s.l. Forb up to 1.5 m hg in open short tall grassland. Marginal flowers white, central - yellow. Not rare.