S. Vietnam, Kontum Prov., Kon Plong Distr., Hieu Municipality, Mang La forest enterprise (14°39′N, 108°25′E). Primary broad-leaved closed evergreen wet mountain forest on sandstone steep slopes of forest river at elev. 1100-1200 m. Herb up to 0.6 m hg in open place along road. Flowers blue-violet. Common. Commonest weed in the area.
VH 5703 24.04.2000
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6383-98)