The word leaf comes from the Latin ”folium”. Leaf is a word that can have several meanings, but its main meaning is to describe a generally flat organ that is specialized mainly in carrying out photosynthesis, which is the one that is in charge of the process of changing inorganic matter to organic matter through the solar energy.

The leaves are lamellar or needle-shaped structures that sprout laterally from the stems or branches that have limited growth and have photo-synthesizing tissues because the anatomy of the stems and leaves are closely related and it is a set of various organs that constitute the stem of the plant.

They can also experience pronounced changes in the structure, which may be responsible in most cases, such as adaptation to the environment, as a result of a specialization different from the typical function of this organ.

There are many types of leaves according to their shape or edge, such as simple leaves, compound leaves, ribbon leaves, heart-shaped, ovate, oblong, elliptic, serrated, toothed, auriculate, digitate, palmate, entire, scaly or scale-like, spatulate, among many others. .

Compound leaves are those that are formed by parts called foliose or leaflets, which is the similar aspect to the leaf that a small appendix of the leaf of a plant has by which it is attached to the stem. Elliptical leaves are those that have the shape of an oval. The heart-shaped is the one with a sharp apex and may be wider near the root. And the serrated ones are the ones with the edge in the form of a festoon or wave.

On the other hand, each of the parts or sections that are similar and can be found inside a book or notebook is also called a sheet.