Campbell Loughmiller’s classic field guide will help you identify all the indigenous flowers of Texas. I enjoy this book, but am seemingly identification-incapable. Nonetheless, I keep trying. Whether going on a road trip or tromping through your neighborhood park, this is a great resource.
Wildflowers of Texas
A big book is fun, especially when it contains page upon page of vibrant Texas wildflowers.
Country Roads of Texas: Drives, Day Trips, and Weekend Excursions
If you’re considering making your garden more native, consider checking into the City of Austin’s green garden program: http://www.austintexas.gov/greengarden/