Hi Rolando.
I've given you a general answer about hedge roses, where you asked on my latest blog, but I'm glad you've put this on as a question, where you'll get a greater variety of answers. Good luck. ... and welcome to GoY. :o)

In Scotland I would be looking at the Burnet Rose, Rosa spinosissima, of which there are many cultivars. It grows well in dry, sandy conditions and exposed to sea winds. I see no reason for it not to tolerate heat but you should check this out localy, Rolando.

I do know that various states in the USA use certains species type roses for growing on the freeways to beautify them. Not sure of the exact species involved though.

I have just found this article which gives a large listing of native roses from the USA.

http://davesgarden.com/guides/articles/view/710/

Thankyou, Terratoonie, Bulbaholic, and Fractal for your response to my question on Heat Tolerant Hedge Roses. I will follow up on your advice.
Terratoonie, you have an excellent selection of photos. I enjoyed them.
Bulbaholic, I'll follow up on the Rosa Spinosissima to see if it compatible to my area.
Fractal, I'll check out the site you listed.
Thanks!

Pleased to have been of help :o)