Jade vine produces either red or yellow-green flowers... they're very lovely, and Thailand produces plenty of Jade Vine plants. Here is a link that might be useful: chiropractic advertising

Hello Hank. That's quite a dramatic change isn't it? I had exactly the reverse of that phenomenon with a piece of jade that I bought back from southern Spain several years ago. The mother plant was very pale almost lime green, very much like your plant is now, that is what caught my attention in the first place. There was a piece that had been knocked off as it was adjacent to the main paseo/pavement so I rescued it and grew several plants from it assuming they would be this pale yellow/green/red edged colour. Mother plant was left to bask in the full Costa del Sol sunlight and heat, admittedly in what looked like a poor and thin soil and with goodness knows what watering it as and when...dogs I mean as there were a lot being walked! Every piece I cut up rooted and went on to produce the usual deep green leaves I was more familiar with. They have all retained those nice red edges, but it appears to be the change in growing conditions that has caused the colour change in my case, nothing else I'm sure. That said, and this being the reverse, I would definitely unpot yours and inspect the roots as with you saying it's been wet of late, maybe there could be some root issues starting....so just to make sure. The lower leaves should as you say, drop first, upper leaves yellowing is often a bad sign. What kind of mix is it planted in...the original or has it been repotted? Mine are in very gritty fast draining mixes so no rot issues so far...but they do live inside my gh x365.

Somewhat reminiscent of dog vomit fungus/slime mold, which is harmless to plants. Al

Die and fall off. If you continue to get yellow leaves, you have a continuing problem. May need to repot in a faster draining mix. Make sure your pot has a hole and is not too big for the plant.