Try running an Advanced Search in EUREKA and limiting your Material Type to Electronic BK (book).
Or look at these titles which were found by searching in the NetLibrary Database:
Use these catalogs to find books on your topic. If we don't own them you can request them with InterLibrary Loan.
This Library, along with most academic libraries, classifies materials using the Library of Congress system. Go to the Library of Congress for a detailed outline of categories/call numbers.
If you have a specific plant that you want to search start with a OneSearch keyword search using the name of your species.
You can use the following Subject Headings to browse OneSearch. The links can help you virtually browse the book shelves.
Try a keyword search if you know a specific plant or ethnic group, i.e., california AND ethnobotany, otherwise begin with a subject search using one of the suggested subject headings listed above.
These new books caught my attention; perhaps you will find them interesting as well.