Discussion
The anatomical study of vitex rotundifolia (L.) reveals several xeromorphic traits. There are numerous multicellular trichomes present on both the adaxial and abaxial of the leaf. These trichomes can prevent water loss form the stomata of the leaves. Furthermore, multilayers of palisades are present inside the leaves. These palisades are the columnar chlorenchyma cells that function in photosynthesis. Multicellular trichomes also observed in the epidermis of both petiole and young stem. They can prevent the plants from overexpose to the sun since these plants live in tropical zone. The ring arrangement of vascular bundles is similar to a typical dicot plants. There are thick bast fibers present in the stems that provide strength to the plants. Beside for the transportation of water, secondary growth of xylem also provides strength to the plants. Two transport systems in secondary xylem and phloem are observed. The are the axial system and radial system. The axial system contain tracheary elements, vessel members and the tracheids, fibers, and axial parenchyma. The rays that observed in the pictures provide lateral transport. They mainly contain parenchyma cells and tracheids. Because the water transport tissues have lignified cell wall, they stained red in Phloroglucinol and blue in Toluidine blue.