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 broadleaved evergreen closed forest on steep shale slopes of foothills of limestone ridge at elev. 400-450 m a.s.l. Terrestrial forb up to 1.5 hg in open wet place. Common.