Succulent-leaved sun lover with silky rose-like blooms that thrives where pavement, rock, or sand defeats everything else.
The ASPCA lists purslane (Portulaca oleracea) as toxic to cats and dogs, and to horses, because of soluble calcium oxalates: drooling and tremors, and rarely kidney failure. The ASPCA names that species, but ours is the same genus, so give it the same caution.
For gardeners who like to stay ahead.