Wedelia trilobata perhaps. ( Sphagneticola trilobata )

Here is a link that might be useful: {{gwi:359574}}

AKA "Singapore Daisy" a trailing groundcover. An invasive weed in many warm areas - at least in Australia

It's invasive in Florida.

Here is a link that might be useful: Center for Aquatic and Invasive Plants

Thanks for the replies. Now that I know, it will be coming out this morning.... for sure! It sure helps to know what it is before I let it go too long!