S. Vietnam, Prov. Lam Dong, distr. Lac Duong, municipalite Da Chay, vicinities Klong Lanh village, 31 km to NE from Dalat city. Old open evergreen broadleaved secondary forest rich in primary elements along mt river on W macroslope of Bi Dup mt system at 1500-1550 m alt. (N 12° 08′, E 108° 39′). Tree about 15-20 m hg. Flowers light violet, tepals with deep violet nerves. Common. VH 3921 13.04.1997 International Botanical Expedition of the U.S.A. National Geographic Society (grant No 5803-96)