Vietnam, Ha Giang Prov., Quan Ba Distr. Vicinities of Quan Ba town, about 1 km to the E around point 23?03′45″N, 104?59′29″E at elevation about 600 m a.s.l.
Open spring short tall grassland/sedge swamp on travertine slope of Mien river valley.
Prostrate creeping, sometimes riparian and sub-aquatic herb. Flowers light blue-violet. Very common.