Vietnam, Nghe An Prov., Tuong Duong Distr., Tam Quang Municipality, Tung Huong village, along Khe Mat stream around point 19°03′15″N 104°36′19″ at elevation about 500-560 m a.s.l.
Lowland closed secondary and primary old evergreen forest on steep slopes along rocky limestone ridge and on rocky tops composed with solid limestone.
Lithophytic herb on vertical cliff and on shady rocky outcrops. Very common.
HLF 6716 18 March 2007.
Coll. Averyanov L., P.K.Loc, N.V.Trai, N.T.Vinh, N.D.Phuong, Averyanova A. Grant from Henry Luce Foundation.