Drymaria arenarioides

A federally listed noxious weed that does not occur in the U.S. (presumably it would be weedy if it did). It is common and weedy in parts of northern Mexico, however.

A flower on the road from Chihuahua to Cuauhtemóc, Mexico, 18 Mar 2007.

Plant habit, on the road from Chihuahua to Cuauhtemóc, 18 Mar 2007.