It's portulaca, and I'm not sure, but the name may refer to two different kinds of plant. The one I'm familiar with is a succulent with blooms and grows in all kinds of forbidding situations: western exposure, little water, clay soil (unamended, by the street).
That portulaca? Whatever you do, do not fertilize it. Just water it to get it established.
(can't type much today; sprained a finger)
remembering Ravenwood Ductor ex Tenebris, NDD, CGC (Vergil), such a sweet, funny, goofy, hard-working, earnest Bernese Mtn. Dog .... 3/27/04 - 2/23/11
and Mount Visions Wilson, CGC, 7/13/03 - 11/2/12, a sweet, courageous, determined dog