Answer: The plant world is vast, and a general reference would never be complete for all types of plants all around the world. In some instances, as with a book on cultivated or ornamental plants, the problem is one of expense, with gloassy photos increasing the price of the book to an exhorbitant level. The book would also be too large to handle. As a result, there is some selectivity. The internet is very useful in this regard since a search on a search engine such as google, using the Latin name of the plant, usually yields numerous photos as well as cultural information.
Q&A Library Searching Tips