In Cantonese this is called Chuin Yun and is supposed to be good for treating eye problems. I have been trying to look for its scientific name for some time but have been unsuccessful.
One young lady visitor of this blog wants to do research on this plant for her university project and asked me for help. The Chinese name is Shui Gui Chou 水龟草. I would appreciate it if anyone out there could supply me with the scientific name for it. It would help my young visitor to do her research.