S. Vietnam, Kontum Prov., Kon Plong Distr., Hieu Municipality, Mang La forest enterprise (14°39′N, 108°25′E). Open secondary short tall grasslands along river at elev. about 1100-1200 m. Central flowers yellow, marginal - white. Very common. Commonest weed all over the area.
VH 5527 21.04.2000
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6383-98)