Basal. In some leguminous plants, the leaf base may become swollen, which is called the pulvinus. They are modified in various structures to perform functions accordingly:-Stipules which are modified into leaves help in photosynthesis to synthesize food. 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. (Classification based primarily on attachment or function) Adnate. They protect the leaf in its bud stage. Median. Stipules are morphologically variable and might appear as glands, scales, spines, or laminar (leaf-like) structures. Most plants with trilacunar nodes have stipules; species with unilacuner nodes lack stipules. The main types of stipules are: (i) Free-lateral: The two stipules are free and found on either side of the petiole base. With reference to their morphologies and function, there are various types of stipules: The main functions of stipules are to protect the bud and carry out photosynthesis. 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. Stipules are the lateral appendages which are found attached at the base of the leaf. Also protection of emerging leaves. 1. It … Many monocotyledons have sheathing leaf bases that are concentrically arranged and form a pseudotrunk, as in banana (Musa). With connate stipules from two opposite leaves. With stipules attached near base of petiole. A relationship exists between the anatomy of the stem node and the presence or absence of stipules. In catbrier (Smilax), the stipules function as tendrils. Stipule definition is - either of a pair of small, usually leaflike appendages borne at the base of the petiole in many plants. Interpetiolar. 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. 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. Conclusion Stipules are the basal structures of the leaves, occurring in … With stipule attached to petiole. In monocotyledons, the leaf base expands into a sheath covering the stem partially or wholly. The lateral appendages present at the leaf base are called as stipules.Stipules show wide range of structural diversity. In many epiphytic bromeliads, the pseudotrunk also functions as a water reservoir. Lateral. There are a number of interesting functions demonstrated for stipules of certain plant species. 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