Thua Thien – Hue Prov., Nam Dong Distr., Thuong Lo Municipality, along Cha Mang stream, around point 16°07′46″N 107°44′24″E.
Remnants of primary evergreen broad-leaved lowland forest on very steep hill slopes composed with stratified shale and sandstone at elev. about 250-300 m a.s.l.
Treelet 4-5 m tall along shady rocky stream slopes. Flowers pink-purple. Not common.
HAL 10900 5 Apr. 2007. Coll.: L.Averyanov, Phan Ke Loc, A.Averyanova, N.D.Phuong, L.V.Hung.