N. Vietnam, prov. Cao Bang, distr. Tra Linh, municipality Luu Ngoc, vicinities of Lung Mu village (N 22°47′ E 106°18′), about 14 km from Cao Bang town to the N. Secondary shrubs and grasslands on alluvial valley between remnant limestone ridges and mesas at 600-650 m alt. Grass up to 1.5 m hg. Common.
CBL 1154 13 Dec. 1998 International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)