N. Vietnam, prov. Son La. Secondary open forests and shrubs along road from Dien Bien Phu town to Son La. Woody grass up to 10 m hg on steep shale slopes at elevation about 500-700 m. Very common.
NTH 2797 26 May 1999
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)