1. Leaf shape: Leaves can have various shapes, such as lanceolate, ovate, cordate, or linear.
2. Leaf margin: The edge of the leaf can be smooth (entire), serrated (toothed), or lobed.
3. Leaf venation: The pattern of veins on the leaf can be pinnate, palmate, or parallel.
4. Leaf surface: Leaves can have a smooth, hairy, or waxy surface.
5. Leaf color: The color of leaves is usually green, but can vary depending on the plant species and environmental conditions.
Internal leaf:
1. Epidermis: The outer layer of cells on both the upper and lower surfaces of the leaf.
2. Mesophyll: The inner tissue of the leaf, consisting of chloroplasts-containing cells (palisade mesophyll) and spongy mesophyll.
3. Veins: The vascular tissues that transport water, minerals, and nutrients throughout the leaf.
4. Stomata: Small pores on the leaf surface that allow for the exchange of gases.
5. Trichomes: Hair-like structures on the leaf surface that can serve various functions, such as protection or water conservation.