All the Wasowski books are excellent for learning about native Texas plants -- we have always promoted them as the "bibles" for responsible gardening/landscaping. Recently, a reader in Cedar Hill recommended Bringing Nature Home by Douglas W. Tallamy because it explains "WHY native plants are so important." I haven't checked it out yet, but I trust her knowledgeable opinion. (Thanks, Meg!)
Our good friend Jason Singhurst co-authored a text about rare Texas plants that was recently published by Texas A&M Press. Rare Plants of Texas is a thorough guide, complete with photos, botanical drawings, and distribution maps. Jason will be speaking to a local chapter of the Native Plant Society this spring; please check back for date and time.