I'm sorry, I saw your listing said Wildflowers of Texas and I thought it may have been another book she had out. She did an assortment of reference books.
It is an excellent reference, particularly applicable to the area of east Texas that I am in. I have found IDs for a wild orchid (Crippled Crane Fly orchid) that is growing here. Also this was the first book I found reference to the Spigelia or Indian Pink that is growing wild by my pond. It is a reference that I will treasure.
