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 forest on steep shale slopes at elev. 450-500 m a.s.l. Forb up to 0.2 m hg in wet shady place. Flowers pink-violet, anthers yellow. Rare.