Vietnam, Quang Binh Prov., Quang Ninh Distr., Truong Son municipality, around Long Son village at 17°13′11″N 106°26′58″E.
Secondary dry forest on the top of highly eroded karst limestone hill composed with gray solid limestone above high vertical cliff along Long Dai River at elevation about 300 m a.s.l.
Lithophytic and epiphytic undershrub on vertical cliff. Very common.
HAL 11481 11 April 2008 Coll.: L.Averyanov, P.K.Loc, N.T.Vinh, N.S.Khang