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 up to 1.2 m tall on steep shady rocky slope in wet place along stream slope. Flowers pink-reddish. Leaves uniform green, petioles and stem green to reddish-brown. Locally very common.
HLF 1718 7 May 2003.
Coll. N.T.Hiep, L.Averyanov, N.T.Vinh et al. Grant from Henry Luce Foundation.