In many epiphytic bromeliads, the pseudotrunk also functions as a water reservoir. Stipule definition is - either of a pair of small, usually leaflike appendages borne at the base of the petiole in many plants. With reference to their morphologies and function, there are various types of stipules: Many monocotyledons have sheathing leaf bases that are concentrically arranged and form a pseudotrunk, as in banana (Musa). Function The main function of stipules is to protect the next leaf, but the main function of bracts is to attract pollinators. With stipules adnate to petiole and free part of stipules located along the 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. Stipules are the lateral appendages which are found attached at the base of the leaf. With connate stipules from two opposite leaves. 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. With stipule attached to petiole. Also protection of emerging leaves. A relationship exists between the anatomy of the stem node and the presence or absence of stipules. They protect the leaf in its bud stage. It … The main types of stipules are: (i) Free-lateral: The two stipules are free and found on either side of the petiole base. The main functions of stipules are to protect the bud and carry out photosynthesis. Interpetiolar. Most plants with trilacunar nodes have stipules; species with unilacuner nodes lack stipules. In monocotyledons, the leaf base expands into a sheath covering the stem partially or wholly. Stipules are mainly green in color, while bracts can have different colors, including green. Stipules are morphologically variable and might appear as glands, scales, spines, or laminar (leaf-like) structures. The lateral appendages present at the leaf base are called as stipules.Stipules show wide range of structural diversity. In catbrier (Smilax), the stipules function as tendrils. In some leguminous plants, the leaf base may become swollen, which is called the pulvinus. The petiole also plays an important role in the fall, when deciduous trees drop their leaves. Median. Lateral. 1. With stipules attached near base of petiole. They are modified in various structures to perform functions accordingly:-Stipules which are modified into leaves help in photosynthesis to synthesize food. Basal. 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. 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