Drymaria holosteoides
A low, spreading plant found in Baja California, very similar to Drymaria pachyphylla. Since I do not have access to floras that include the two, I'm not actually sure what the distinction, if any, is between them.
Plant habit, south of Punta Bufeo on the gulf coast of Baja, 18 Oct 2006.
A flower, south of Punta Bufeo, 18 Oct 2006.
An inflorescence, south of Punta Bufeo, 18 Oct 2006.