A leaf is one of the most important parts of a plant. Its main functions are photosynthesis and gas exchange. The leaves take in sunlight and use water and food from the roots to make the plant grow, and to reproduce. A leaf is often flat, so it absorbs the most light, and thin, so that the sunlight can get to the chloroplasts in the cells.
Leaves are normally green in color, which comes from chlorophyll found in the chloroplasts. Chlorophyll is used for photosynthesis by absorbing energy from sunlight during spring and summer. Plants that lack chlorophyll cannot photosynthesize.
Plants with leaves all year round are evergreens, and those that shed their leaves are deciduous. Deciduous trees and shrubs generally lose their leaves in autumn when their chlorophyll is gone. Before this happens, the leaves change colour to yellow or red.
We collected here outline drawings of leaves from more than 200 kind of trees, flowers and other plants.