Texas Master Naturalist Chapters are often helpful for acquainting youngsters with the flora and fauna of Texas. Their mission is self-described
"The Mission: To develop a corps of well-informed volunteers to provide education, outreach, and service dedicated to the beneficial management of natural resources and natural areas within their communities. Many communities and organizations rely on such citizen volunteers for implementing youth education programs; for operating parks, nature centers, and natural areas; and for providing leadership in local natural resource conservation efforts. In fact, a short supply of dedicated and well-informed volunteers is often cited as a limiting factor for community-based conservation efforts."
Some of the chapters are
Read more at http://masternaturalist.tamu.edu/
Members may be aware of books applicable to your locale.