Only during the, Impatiens neo-modesta growing on a moist moss cove, How plants travel? Leaves occur in various arrangements in plants. Leaf bears abundant stomata for the exchange of gases. This is usually of three types alternate, opposite and whorled. When the single leaflets in the unipinnate leaves get replaced with tripinnate leaves, it is called as quadripinnate leaves! Example: Coriandrum sativum (coriander), In palmately If a leaf has a divided blade—one that forms a collection of leaflets—it is considered a compound leaf. They are the most important vegetative organs for photosynthesis. When the single leaflets in the unipinnate leaves get replaced with bipinnate leaves, it is called as tripinnate leaves! What’s special about this post? The sheathy leaf bases combine to form a pseudo stem that supports the plant to … cylindrical leaves. pinnately compound leaf, a number of leaflets are present on a common axis, the These leaves do not have a pattern to count the number of times compound. A compound leaf may be either pinnately compound or Palmately compound. These leaves contain leaflets arranged in opposite arrangement on the rachis (the extended petiole). Clover Leaves. A bud is present in the axil of petiole in both simple and compound leaves, but not in the axil of leaflets of the compound leaf. Examples: Azadirachta indica (unipinnate), Mimosa pudica (bipinnate) and, Moringa oleifera (tripinnate). . It is always attached to a twig by its stem or the petiole. The veins branch dichotomously. Example: Clover (Ran methi). The lateral veins run parallel to one another without forming anastomoses e.g. In the opposite type, a pair of leaves arise at each node and lie opposite to each other as in, If more than two leaves arise at a node and form a whorl, it is called whorled, as in. Before actually getting into the topic, one should know what s simple leaf looks like. A multifoliate leaf to be specific . The most beautiful plant genus I know! not touch the midrib. Broadly all leaves are classified into two main types, based on the arrangement of the leaf lamina (the broad, thin, flattened surface of the leaf), which is the site of photosynthesis and transpiration in plants. However, they are also commonly categorized based on the shape of the leaf, and sometimes the plants they are found in. A leaf may be defined as “A dorsoventrally compressed, lateral appendage of the stem, produced at the nodes and is specialized to perform photosynthesis. Quadrifoliate. These leaves will contain two leaf blades attached to the petiole at a single point. leaves of dicots, Peepal (Ficus religiosa) (पीपल), Shoe-Flower (Hibiscus rosasinensis) (जास्वंदी), etc. They are further In monocotyledons, the leaf base expands into a sheath covering the stem partially or wholly. The shoot system is heterogeneous. It does not contain apical bud required for continuous growth hence it has limited growth. 1) Fronds – Leaf of fern plants such as club-mosses and horsetails, 2) Leaves of conifer – Found in plants such as fir and pine, 3) Leaves of angiosperm – Leaves of common flowering plants such as rose, dahlia and, sunflower, 4) Sheath leaves – Elongated and tubular leaves as found in variety of grasses. It is further divided into two types. Types. The body of a typical flowering plant can be divided into the underground root system and aerial shoot system. We, botanists, should see it differently though. Veins provide rigidity to the leaf blade and act as channels of transport for water, minerals and food materials. . Simple – A life with undivided lamina is known as simple leaf. Reproduction in whole or in part without permission is prohibited. (exceptions: Calophyllum, Corymbium, Eryngium). Mano, Peepal. If a leaf has an undivided blade, it is classified as a simple leaf. The main functions of stipules are to protect the bud and carry out photosynthesis. Learn how your comment data is processed. of the petiole, as in silk cotton. Your email address will not be published. Example: Oxalis, Marsilea. This site uses Akismet to reduce spam. . Examples: Citrus limon (unifoliate), Bauhinia yunnanensis (bifoliate), Acer cissifolium (trifoliate), Oxalis (quadrifoliate) and, Umbrella plant (multifoliate). Phyllotaxy is the pattern of arrangement of leaves on the stem or branch. Compound Leaves: In this . help to hold the blade to light and also in conduction. There is a single principal vein or midrib that runs from base to the apex of the lamina. After reading this article you will learn about: 1. e.g. Multiple leaflets arise from a common point that is at the end of the petiole. Sheathy leaf bases. © 2020 - Happy Botanist - All Rights Reserved, Brightness up for this one, please! Example: Moringa oleifera (drumstick), In this type, the rachis gets branched thrice or more than thrice and the leaflets arise on the ultimate branches. (e.g., ferm Adiantum, Circeaster). These leaves will contain two leaf blades attached to the petiole at a single point. The petiole classified as, Unipinnate Compound Leaves: If the leaflets arise on primary rachis itself then it is known as unipinnate compound leaf. The green colour is due to the presence of chlorophyll pigment. The lamina possesses prominent vascular strands called veins. Save my name, email, and website in this browser for the next time I comment. They give rise to lateral veins connected by reticulations of veinlets. 5) Specialized and unusual leaves – Leaves of insect-eating plants such as pitcher plant and venus flytrap. Christisonia tubulosa – The Magenta Ghost Flower, Nicotiana attenuata – A plant with amazing adaptations, Sequoiadendron giganteum – The Giant Sequoia, https://dev.biologists.org/content/131/18/4401, The Anatomy and Growth Cycle of the Cannabis Plant - Wikileaf, Impatiens of the Western Ghats | Happy Botanist, Types of Leaves with Examples and Pictures. These are given below. Quadrifoliate: These leaves have four leaflets arising from the same point. A typical leaf consists of three main parts: leaf base, petiole, and lamina. The benevolent mountains On the basis of the number of Types of leaf - Leaves are of two types. The lateral veins run parallel to one another without forming anastomoses e.g. leaf is a green expanded exogenous lateral outgrowth which arises from the node of a stem or its branches. Examples: Neem, rose, clover, desert cotton, poison ivy, horse chestnut and, baobab. When the single leaflets of the unipinnate leaf get replaced with unipnnate leaves themselves become bipinnate leaves. Four leaves would be fused to a petiole and appear to be a single leaf. These appear to be three leaves originating from the anterior end of the petiole. Some plants lack true woody stems. plants the shape and form of leaves are such that it is difficult to Who said stars. The shape, margin, apex, surface, and extent of incision of lamina varies in different leaves. Depending on the number of times the leaflet is attached to the midrib, pinnately compound leaves are categorized into the following types: i) unipinnate – single compound leaf attached to the midrib in an opposite fashion, ii) bipinnate – single leaflets of the unipinnate leaf gets replaced with unipinnate leaves and, iii) tripinnate – single leaflets of the unipinnate leaf gets replaced with bipinnate leaves. Quadrifoliate Palmately Compound Leaves: With four leaflets. It gives rise to lateral veins along its entire length. They are important for the conduction of water and nutrients. . In an alternate type of phyllotaxy, a single leaf arises at each node in an alternate manner, as in China rose, mustard and sunflower plants. Examples: Citrus limon (unifoliate), Bauhinia yunnanensis (bifoliate), Acer cissifolium (trifoliate), Oxalis (quadrifoliate) and, Umbrella plant (multifoliate). Example: Baobab, Umbrella plant. It consists of a stem, branches, leaves, flowers, fruits, and seeds. Impatiens of the Western Ghats! In oddly paired pinnate leaves, the leaflets are arranged in opposite fashion with a trailing leaf at the anterior end of the rachis and is called imparipinnate. leaves of monocots, maize, grass, banana (Musa paradisiaca), canna. It is borne on the stem at the node, hence it is exogenous. . Read about the genetics behind Compound Leaves in this interesting research article – https://dev.biologists.org/content/131/18/4401, Cassava leaf is a compound leaf. Your email address will not be published. Example: Bauhinia Yunnanensis (butterfly tree / kanher). etc. Four leaves would be fused to a petiole and appear to be a single leaf. The leaves may be of three types based on the number of times of pinnation as follows. Example: Mimosa pudica (Touch me not), Tripinnately Compound Leaves: In this type, the rachis gets branched twice and the leaflet arises on the tertiary rachis. Your email address will not be published. It is further divided into two types.
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