N. Vietnam, prov. Cao Bang, distr. Tra Linh, municipality Quang Vinh (N 22°51′ E 106°14′), about 21 km from Cao Bang town to the N. Primary evergreen closed wet forest on steep slopes and bluffs of remnant limestone ridge at 650-800 m alt. Woody climbing grass with shoots up to 5-6 m lg. Common monodominante on open steep slopes and on tops of ridge (especially after forest fire).
CBL 990 09 Dec. 1998
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)