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 at the base of slope of highly eroded karst limestone Cop Cuong mountain composed with gray solid marble limestone allied to Long Dai River, just along river at elevation about 50 m a.s.l.
Treelet about 5 m tall, flowers light yellowish. Not common.
HAL 11514 12 April 2008 Coll.: L.Averyanov, P.K.Loc, N.T.Vinh, N.S.Khang