Wild flowers of the United States: General editor, William C. Steere

v.1. (in 2 pts.) The Northeastern States.- v.2. (in 2 pts.) The Southeastern States.- v.3. (in 2 pts.) Texas.- v.4. (in 3 pts.) The Southwestern States.- v.5. (in 2 pts.) The Northwestern States.- v.6. (in 3 pts.) The Central Mountains and Plains.- v.7. Index.