N. Vietnam, Thai Nguyen prov., Vo Nhai distr., Than Sa municipality, vicinities of Kim Son village (N 21°48′ E 105°54′), 23.3 km to 18° of Thai Nguyen city. Forb with pendant shoots up to 1.5 m lg. Codominanthe of the lithophytic forb communities on shady limestone cliffs along stream at 40-80 m a.s.l.