A radish is a dicot, not a monocot. Dicots are flowering plants that begin life with two cotyledons or embryonic leaves, while monocots are plants that begin life with a single embryonic leaf. The term monocots covers all flowering plants that cannot be classified as dicots.
While the leaf veins of a typical dicot tend to form a broad, intricate mesh, monocot leaves have parallel veins running through the length. Moreover, when viewed through a microscope, the leaf pore (stomata) of monocots, visibly lie in neat parallel rows, similar to its veins. In contrast, the stomata in the surface of dicot leaves are usually scatted randomly across the leaf’s surface. Monocots are characterized by masses of fibrous roots, but most dicots, including radishes, produce tap roots.