Agricultural botanyComposition

Plants can be studied from many different aspects, and this creates special branches and sections of science. One may limit attention to researching the functions of the different parts of the plant's body - to the work that the leaves, roots, and flowers do in the life of the plant - and this research of science is known as "the science of physiology." "Organs" may mean the form of the different parts, their origin, development, and unfolding, and the relationship of the different parts to each other without reference to the work they perform. This branch is called "the science of external form." It may study the structure of the different parts of plants and their organization to determine The similarities and differences between them lead to placing all plants that have some similarity into classes, and this is called the study of "ordinal plants."
For the sake of expansion and familiarity with it in a logical way, science may be divided into several other sections, and the study of plants in each section from one aspect is different from the other. In this book, the author is limited - primarily - to seed plants, although the other orders of the plant kingdom are worth considering, because this section includes common plants everywhere.