S. Vietnam, Kontum Prov., Kon Plong Distr., Hieu Municipality, Mang La forest enterprise (14°39′N, 108°25′E). Open grassy swamp along forest river at elev. 1100 m. Creeping sometime aquatic plant, flowers light blue. Very common.
VH 5451 20.04.2000
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6383-98)