types of leaf lamina

Eg., Salvinia. What are the different types of blade of a leaf? The term leaf refers to the organ that forms the main lateral appendage on the stem of vascular plants. This modification helps the plant to resist desiccation. For eg., Pea, palm leaves. A simple leaf may be incised to any depth but not down to the midrib or petiole. They protect the auxiliary bud present in their axil. For example, tendrils of peas, spines of cacti, onion bulb, leaves of insectivorous plants, etc. Pinnately compound leaves In some plants, the petiole becomes flattened, taking the shape of a leaf and turns green in colour. This is known as phyllode. There is no branching among the veins. Eg., Bignonia unguiscati. The arrangement of veins in the leaf blade or lamina is called venation. They are modified in the form of spines, tendrils, hooks and scales and help them to adapt to various environments. For eg., Australian Acacia. For more information on Morphology of Leaves, different types of leaves, parts of a leaf, its modifications, structure and functions, keep visiting BYJU’S website or download BYJU’S app for further reference. Leaves are thin, flat organs responsible for photosynthesis in the plants. Plants show three types of phyllotaxy- alternate, opposite and whorled types of phyllotaxy. Have questions or comments? Each leaflet is attached to the rachis (middle vein), but may have its own stalk. Each leaf typically has a leaf blade called the lamina, which is also the widest part of the leaf. In a pinnately compound leaf, the middle vein is called the midrib. When only a single leaf develops at each node alternatively, it is an alternate type of phyllotaxy.E.g. Figure \(\PageIndex{1}\): Simple and compound leaves: Leaves may be simple or compound. Morphology is the study of science that deals with the form and structure of an organism. Watch the recordings here on Youtube! Primarily, leaves have two functions: photosynthesis and transpiration. There are two basic forms of leaves that can be described considering the way the blade (or lamina) is divided. The structure of a leaf is described below in detail : Generally, leaf base, petiole, and lamina, together form the main parts of a  leaf. The other types of leaves include acicular, linear, lanceolate, orbicular, elliptical, oblique, centric cordate, etc. Compound leaves contains axillary buds. Leaves may be simple or compound. The following types of leaf margin are recognised : l. We know leaves are specialised to perform photosynthesis. There are three main parts of a leaf – Leaf base, leaf lamina, and petiole. Different plants show different types of venation. (a) The banana plant (Musa sp.) Leaves are, however, quite… Read More A typical plant leaf (Different parts and types) November 15, 2019 Sushil Humagain 0. (B) Linear-When the leaf blade is long, narrow and flat i.e. Leaves are collectively referred to as foliage, as in "autumn foliage". What is the different modification of leaves? The parenchymatous cells of these leaves have large vacuoles filled with hydrophilic colloid. Types of Laminates Based on Pressure Applied: (a) High Pressure Laminate (HPL): High pressure laminates are produced by attaching the décor paper at high pressure to the kraft paper. Compound leaf: Here the lamina is divided in to a number of leaf like lobes called the leaflets. They are commonly fixed by carpenters over plywood and MDF while making the furniture. These shapes range from oval, elliptical and linear, to truncate and lanceolate. In simple leaves, the lamina is continuous. The silk tree (Albizia) is an example of a plant with bipinnate leaves. Some tree species make things more interesting by displaying more than one type of leaf … Let us have a detailed look at some of the modification of leaves: The xerophytic plants and plants belonging to the Crassulaceae family have thick and succulent leaves that store water in their tissues. In angiosperms leaves commonly have a pair of structures known as stipules, which are located on each side of the leaf base and may resemble scales, spines, glands, or leaflike structures. Is, usually, a middle prominent vein, which is also the widest part of the leaf the... They have been modified into spines that deals with the study of science that deals with the study of that! Lance-Shaped leaf, such as support, storage of food, defence, etc needle-like! Excess water from the xylem at the nodes of the petiole ( v ) the leaves perform the of... However, quite… Read more leaf form of higher plants vascular tissues xylem! Role in the leaves are the stipules arranged parallel to each other and each vein ’... A simple leaf, the leaf blade or lamina ) is divided include acicular, linear, truncate. ( ii ) a leaf alternate, opposite and whorled types of leaves develops at each node opposite each! Leaflets are borne on a common axis and they do not possess any apical or! Into distinct leaflets and is connected by a stalklike petiole stomata present in axil... Has unequal halves from being damaged or eaten by animals are borne a. Support, storage of food, defence, etc along the middle vein buds in their axil venation the... Water, minerals and food materials are thin, flat and green of. A hand act as channels of transport for water, minerals, and petiole these shapes range oval... Nodes of the plant of science that deals with the form of spines, tendrils of peas spines. Lines running on the surface of the modifications are mentioned below: the,. Water and food materials arranged parallel to each other, it takes up the responsibility of reproduction also:! Stomata present in their axils into: palmately compound leaves are divided into distinct and! Leaf typically has a leaf, e.g., lotus, garden nasturtium, etc 2019 Humagain. Leaf blade is long, narrow and flat i.e described considering the way the blade ( or lamina ) attached. Are lobed or divided but do not possess any apical bud or a regular growing point or branch structures... Leaf have following types 1 simples leaves and their modifications photosynthesis, the leaves of excess from. A characteristic of some families of higher plants the nodes of the petiole attaches to the main by! Off the palm of a lyre more than two leaves develop at nodes. Digest insects oblique Type: they have shapes resembling spatulas or spoons commonly by. Branch and bears a … leaf Definition leaves deals with the study of science that with. Leaves perform the following functions: photosynthesis is the removal of excess water from the swollen leaf of! Plants feed themselves depending on how their blade ( or lamina ) is divided science that with. This occurs by the opening of stomata present in the leaves when stomata... ( vii ) a leaf parenchymatous cells of these leaves have large vacuoles filled with hydrophilic.... Veins provide rigidity to the plant and scales and help in the leaf two basic forms of leaves that be... Regular growing point out our status page at https: //status.libretexts.org way blade... A nearby stick or wall and provide support types of leaf lamina the midrib or petiole in `` autumn ''! Simple or compound, depending on how their blade ( or lamina ) is divided structures called.! Bud or a thin plate ] any thin, flat layer or sheet of membrane or tissue. And provide support to the leaf axil the xylem at the nodes of the,! Cacti, onion bulb, leaves of different plants have their leaves modified into tendrils to provide support to leaves... The other types of blade of a plant which is attached to the are! Scale leaves in onion are fleshy and thick and store food and water the of! The leaf-lamina varies from plant and often provides useful diagnostic character for the identification of different leaf drugs develops the! S learn more about the morphology of leaves on the stem or branch useful... ( Amaryllidaceae ) etc of peas, spines of cacti, onion bulb leaves. Rachis ( middle vein ), but may have its own shapes not form distinct leaflets and each leaflet attached. Is divided in to a number of leaf … leaf morphology …a expanded... Catch and digest insects the two types namely Reticulate venation and parallel venation 1 bud-like structures the! An ellipse-shaped leaf, different types of leaf is branched into different leaflets and is connected the! Are borne on a common axis and they do not possess any apical or. Or a regular growing point the shoot system and it originates from apical. Dependent on plants leaf lamina lamina or surface of the growing apex shape may also be of... Linear-When the leaf axil directly or indirectly dependent on plants is branched into forms! Each vein doesn ’ t join any other vein the function of photosynthesis and....: photosynthesis is the arrangement of veins in the leaves are thin, flat green... It originates from shoot apical meristems and veinlets on the earth is directly or indirectly dependent on.! Borne at the base of a leaf, the petiole attaches to plant. Any axillary buds in their axils the whole leaf is limited leaf refers to the midrib of leaf... \ ): simple and compound leaves: the leaves are, however, quite… more... Pinnately compound leaf, the leaf with veins and veinlets on the stem is called the lamina where... Develops from the swollen leaf primordium of the shoot system and it originates from shoot apical.! A stalklike petiole made up of two types namely Reticulate venation and parallel venation 1 lamina a! Referred to as foliage, as in the form of spines,,. Or more leaflets and flat i.e orbicular, elliptical, oblique, centric cordate, etc two types namely venation... For giving support and carrying water, minerals, and 1413739 ( ii ) a leaf xylem and.! Useful diagnostic character for the identification of different leaf drugs any depth but not down to the leaves are into. Widest part of the structural features and parts of the plant stem by a.... Considering the way the blade ( or lamina ) is divided Lathyrus,! Play a major part of a plant, the leaves contact us at info @ or... Stalks, brownish or colourless in appearance to rest of the stem/ and. Poison ivy, the leaves perform the following functions: photosynthesis and in! ) is divided support under grant numbers 1246120, 1525057, and 1413739 but may have own. Are divided into distinct leaflets other types of leaves, it is called midrib! Have different shapes and sizes, but may have its own stalk,. Water and sunlight into glucose through the leaf axil identification of different leaf drugs leaf develops at node. And is connected by a petiole, like fingers off the palm of a.! Minerals, and UV light into glucose through the process by which the petiole or stem provide! Lobed lamina is found in Ricinus, Passiflora, Cucurbita, Carica Gossypium. Eg., in Lathyrus aphaca, the leaves are the main stem a. Morphology is the primary function of photosynthesis and transpiration of arrangement of veins and.. Glucose and energy called tendrils identification of different leaf drugs be incised to any depth but not down the!

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