S.Vietnam, Thua Thien Hue Prov., Xuan Loc Distr., Bach Ma National Park, along Dong Truoi ridge and S slopes around point 16°14′11′'N 107°44′28′'E.
Broad-leaved evergreen primary closed forest on very steep slope at elev. 800-900 m a.s.l. Terrestrial and lithophytic herb on very steep rocky slope. Flowers white. Common.
HLF 1713 7 May 2003.
Coll. N.T.Hiep, L.Averyanov, N.T.Vinh et al. Grant from Henry Luce Foundation.