Vietnam, Quang Tri Prov., Huong Hoa Distr., Huong Phung Municipality, Sa Mui pass, around point 16°47′42″N 106°35′50″E at elevation about 1000 m a.s.l.
Secondary broad-leaved evergreen submontane forest on shale mountains.
Terrestrial herb 1.5 m tall along rocky shady stream valley. Flowers green, anthers yellow. Not common.
HLF 6269 28 March 2006.
Coll. L.Averyanov, P.K.Loc, P.V.The. Grant from Henry Luce Foundation.