https://en.m.wikipedia.org/wiki/DiodiaHmmmm.... looks very close.
I just googled Mexican clover and all the pictures showed 6 petal white flowers. The one in my yard is only 4 "petals" ... and the new leaves tend to grow from the inside of the previous leaf ... the Mexican clover looks like it grows more of a standard stem.
I'll try and take some better pictures tomorrow. You have definitely found something close Ms @TriciaStringer