Vietnam, Quang Tri Prov., Huong Hoa Distr., Huong Phung Municipality, Sa Mui pass, around point 16°48′36″N 106°34′44″E at elevation about 1400-1500 m a.s.l.
Primary broad-leaved evergreen submontane forest on very steep rocky shale southern slopes of Sa Mui Mountain.
Shrub 2 m tall on top of mountain at elevation about 1500 m a.s.l. Flowers white. Not common.
HLF 5803 29 March 2006.
Coll. N.T.Hiep, L.Averyanov, P.K.Loc, P.V.The, N.S.Khang, P.H.Duc, L.T.Son, S.Bounphanmy, T.K.Ratana, O.Sonliya, T.Q.Dang, N.V.Hien, H.T.N.Trang, L.T.Chau. Grant from Henry Luce Foundation.