Help identifying blue star-shaped Texas wildflower?
New to the boards, so I hope I'm posting in the right place. my friend posted a picture of a really interesting looking flower he found growing naturally in his back yard (in Austin, TX, I believe) which we've been struggling to identify. It reminds me a bit of morning glories, but I know that's not what it is. Any help? Here's a link: http://i.imgur.com/8RzLs.jpg
Thanks in advance.