This illustrated textbook on plant biology is intended mainly for first-year undergraduates in the field of natural and life sciences, as well as for students in other disciplines who are interested in this subject. The aim is to provide students of Biological Sciences, Environmental Sciences and Agricultural Sciences with an academic reference document. The established course includes the General Classification of Plants, Plant Morphology, Histology, Anatomy and Reproductive Biology of Spermaphytes (Angiosperms and Gymnosperms). The writing of this book was essentially based on information collected and synthesized from various references on Plant Biology, Plant Physiology and Plant Systematics.