This is a "Cardo Silvestre" (Bull Thistle) next to the Limay River, a few meters away from the Anfiteatro. I took this photo in January 2009, almost a year after I took the first shot I uploaded here... If you want to see/remember that HDR Anfiteatro shot click here.
As you can see here someone took one of these flowers, so this is all but one.
EXIF. ISO: 200, Exposure: 1/125 sec, Aperture: 9.0, Focal Length: 30mm., SW: gimp.