Basal. Function The main function of stipules is to protect the next leaf, but the main function of bracts is to attract pollinators. Many monocotyledons have sheathing leaf bases that are concentrically arranged and form a pseudotrunk, as in banana (Musa). A relationship exists between the anatomy of the stem node and the presence or absence of stipules. In some plants we can see lateral small-leaf like structure at the leafbase.When the leaf is a bud stipules protect the bud as a cover.Later ,it changes into thorns or stay without change. There are a number of interesting functions demonstrated for stipules of certain plant species. Interpetiolar. Also protection of emerging leaves. Median. In many epiphytic bromeliads, the pseudotrunk also functions as a water reservoir. With reference to their morphologies and function, there are various types of stipules: With stipule attached to petiole. The stipules can develop a lot, so as to perform the function of chlorophyll photosynthesis or they can undergo metamorphosis transforming into thorns, probably with a defensive function, as in the case of black locust. In some leguminous plants, the leaf base may become swollen, which is called the pulvinus. Conclusion Stipules are the basal structures of the leaves, occurring in … The lateral appendages present at the leaf base are called as stipules.Stipules show wide range of structural diversity. Stipules that are green may be leaf-like (Examples: flowering quince, a geranium, and a sycamore) , linear, thread-like, or reduced to minute scales, thereby requiring a hand lens to see. Stipules are morphologically variable and might appear as glands, scales, spines, or laminar (leaf-like) structures. They are modified in various structures to perform functions accordingly:-Stipules which are modified into leaves help in photosynthesis to synthesize food. In catbrier (Smilax), the stipules function as tendrils. Stipules are mainly green in color, while bracts can have different colors, including green. It … They protect the leaf in its bud stage. Lateral. With stipules attached near base of petiole. With stipules adnate to petiole and free part of stipules located along the petiole. The petiole also plays an important role in the fall, when deciduous trees drop their leaves. Stipule definition is - either of a pair of small, usually leaflike appendages borne at the base of the petiole in many plants. With connate stipules from two opposite leaves. The main types of stipules are: (i) Free-lateral: The two stipules are free and found on either side of the petiole base. Most plants with trilacunar nodes have stipules; species with unilacuner nodes lack stipules. Stipules are the lateral appendages which are found attached at the base of the leaf. (Classification based primarily on attachment or function) Adnate. In monocotyledons, the leaf base expands into a sheath covering the stem partially or wholly. The main functions of stipules are to protect the bud and carry out photosynthesis. 1.