Can someone please help me identify the flower in the attached photographs? The photo was taken in an area of low growth and grass along the edge of Tasik Biru (an old gold-mining crater now filled with arsenic-laced water) near the town of Bau in Sarawak. Thank you for your help.
This looks like Sphagneticola trilobata, also known as Wedelia trilobata. It's native to tropical America (including West Indies) but has been widely planted in Asia etc, now running wild everywhere that has a climate to its liking.