Start your research by reviewing books on your topic. This is a great way to familiarize yourself with the main ideas and keywords on the topic.
Use Summon to find books, reports and other background information. Start with a broad keyword search. (Tip - Try the scientific name for your plant). Limit your results by Book/ebook.
Once you find a book that looks useful for your topic, look at the Subjects in the record. You can then click on those hyperlinks to find more books on that topic.