Weedy plant in our yard, it can get somewhat tall with a branching habit; pink flower has a not-very-attractive fungal look.
I cannot help you very much on this. I am certain this is caused by an insect that forms a gall on the plant, and not a fungus. The plant looks a lot to me like Acalypha gracilens or a close relative, but I cannot be certain. Also, I have not been able to match this particular gall on the internet. At least we have a start.
Steve Hill, Ph.D. Botanist, SCNPS