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 broad-leaved forest on the top and on slopes of highly eroded karst limestone Cop Cuong mountain composed with gray solid marble limestone allied to Long Dai River at elevation 300-400 m a.s.l.
Terrestrial fern on shady rocky slope near the top of mountain. Common.
HAL 11509 12 April 2008 Coll.: L.Averyanov, P.K.Loc, N.T.Vinh, N.S.Khang