Lilac leaf. Light micrograph (LM) of a transverse section through the leaf (pinna) of a lilac plant. The lilac plant is a dicotyledonous shrub is a species of flowering plant in the olive family Oleaceae. Grown for its scented flowers in spring, this large shrub or small tree is widely cultivated and has been naturalized in parts of Europe, Asia and North America. Present is a central vascular bundle made up of phloem sieve cells (green) and xylem tracheids (red). Dicot leaves are dorsoventral as the upper and lower surfaces of the leaves are distinguished. The vascular bundle is large in dicot leaf whereas in monocot leaf, both small and large parallel vascular bundles are present. Magnification: x20 when printed at 10 centimetres wide.