Vietnam, Nghe An Prov., Tuong Duong Distr., Tam Quang Municipality, Tung Huong village, along Khe Mat stream around point 19°03′07″N 104°36′57″E at elevation about 250 m a.s.l.
Lowland closed secondary old evergreen forest on steep slopes along rocky stream valley composed with stratified solid shale and sandstone.
Terrestrial and lithophytic herb along steep rocky shady stream slopes. Flowers green, anthers yellow. Not common.
HLF 6587 16 March 2007. Photo.
Coll. Averyanov L., P.K.Loc, N.V.Trai, N.T.Vinh, N.D.Phuong, Averyanova A. Grant from Henry Luce Foundation.