N. Vietnam, Prov. Cao Bang, distr. Tra Linh, municipalite Quoc Toan, vicinity of Thang Heng and Lung Tao villages near Thang Heng lake. Closed broadleaved evergreen primary forest on steep slopes and bluffs of limestone ridges and mesas at 550-600 m alt. Parasitic shrub up to 1 m hg on high trees. Not common. VH 4925 25-27.05.1997 International Botanical Expedition of the U.S.A. National Geographic Society (grant No 5803-96)