That is a small shrub called Brazilian Rock Rose, or Pavonia, in the mallow family. It has pink flowers open for one day only - have you seen it bloom yet?
The shrub is actually a bunch of the little plants growing together. My neighbor (here in Fort Worth) brought me some from a friend's yard in Austin and over the years I've let it grow in different places. It escapes and can be mowed or transplanted. The folks at Weston Gardens in Bloom always have it for sale and on their web site, though the page isn't working so I pulled up an Internet Archive
link to the old page.