When school let out for the summer, I went south to see my dad and brother. We went for a ride through their citrus groves. Each tire collected thorns as we went. All of the tan material you see on this tire is thorns.
I also managed to get one stuck on the back of my pants ---and then sat on it in the truck. I sure didn't sit for long! These are not the sandspurs I grew up with. I am not sure what they are, but I know they pack a powerful, poky punch.