Borikhamxai Prov., Khamkeut Distr., Phone Sa At Village around point 18°01′48”N 105°02′30”E.
Remnants of primary swamp Glyptostrobus coniferous forest along narrow flat swampy valley of small stream coming from N to the S at elevation 615 m a.s.l.
Climbing shrub to 2 m tall on dry slopes of swamp valley. Flowers yellow. Common.