Cactus country -- Habitat -- Vegetational areas of Texas -- Cactus anatomy -- What is a cactus? -- Features of cacti -- Cactus critters -- How to use this book -- Cactus stem shapes -- Blooming time -- Conservation status in Texas -- Cactus terminology -- Cactus genera of Texas -- Genera of represented cacti -- Species accounts -- Appendix -- Taxonomic synonyms -- Maps of Texas counties.