Theophrastus (370-285 B.C.), a student of Greek philosophers
Plato and Aristotle, was one of the first writers of plant
description. His work with plants earned him the title "Father of
Botany." Altogether, Theophrastus wrote about five hundred
different kinds of plants which he classified into four groups:
trees, shrubs, sub-shrubs, and herbs. He also noted differences in
plant tissues and between flowering and nonflowering plants.