Vietnam, Nghe An Prov., Tuong Duong Distr., Tam Quang Municipality, near Tung Huong village, around point 19°05′23″N 104°39′59″E at elevation about 124 m a.s.l.
Lowland open secondary evergreen forest on steep slopes along rocky stream valley composed with stratified solid shale and solid sandstone.
Terrestrial herb on open wet slopes along stream. Flowers white. Common.
HLF 6552 14 March 2007.
Coll. Averyanov L., P.K.Loc, N.V.Trai, N.T.Vinh, N.D.Phuong, Averyanova A. Grant from Henry Luce Foundation.