Vietnam, Quang Tri Prov., Huong Hoa Distr., Huong Phung Municipality, vicinities of Sa Mui pass, around point 16°46′49″N 106°35′28″E at elevation about 600-700 m a.s.l.
Remnants of primary broad-leaved evergreen submontane forest along rocky river valley on shale rocks.
Terrestrial herb on steep rocky shady slope. Not common.
HLF 5895 30 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.