Dicots, like oak or maple trees, have what is termed netted venation . A close look at the veins shows that the smaller veins are arranged like small interconnected nets. In the pinnately veined leaves on some dicots, there is a main vein, the midrib, with secondary veins branching from it. Palmately veined leaves have several veins branching out from the base of the blade. Plants growing under different conditions have evolved different types of leaves.
Xerophytes usually have thick leathery leaves with a thick cuticle.
Hydrophytes will have many air spaces within the leaves. Floating leaves will be flat and extended with stomata on the surface, while submerged leaves are usually smaller, and have no cuticle. Mesophytes have leaves like I have described as a typical leaf. A plant that normally grows in a dry habitat or survives an extended period of drought. A plant that normally grows in a wet habitat.