A few subject headings to help you search the SDSU catalog for botany titles. Most books will be located in the QH or QL ranges on the 5th floor of Love Library.
Ecology -- QH540-549.5
Regional Ecology -- QH101-198
Evolutionary Biology -- QH359-425
Phylogeny -- QH367.5
Animal Behavior -- QL750-795
Morphology -- QL799-799.5