Salmonella sunflower????

I wrote this Monday that my Campy didn't grow up (or merely tiny spots), but fortunately they look much better this morning. On the other hand, I noticed that one of the Salmonella cultures Medlab gave me last Friday, when I innoculated its culture media (10 ul) on blood agar and incubated overnight, its colonies formed like spreading-out-sunflower. Although some Salmonella do have flagella, it is of interest that they would migrate in this way.