This is seen in Calotropis procera. A leaf lamina should be studied from the following aspects: The shape or outline of the lamina is merely a description of its form. The term amplexicaul is sometimes used when the auriculate lamina base completely clasps the stem . In the first type the strong main veins give rise to finer branches which again branch repeatedly running into one another and forming a reticulum or network all over the leaf. The tendril of Cucurbits may be a prophyll . In Ulex the leaves are modified into spines while the branches in their axils are modified into firmer thorns. Climbing hooks are sometimes modified leaves. Similarly, some palmately lobed leaves show the lobes arranged like the claw of a bird as in Cayratia pedata. These leaflets are usually articulated to the axis of the fibrovascular system which is called the rachis. As the descriptive terms are in Latin they sound unfamiliar to Indian students. (2) Coriaceous—when it is firm and leathery as in mango. (5) Retroserrate—the teeth are pointed downwards. In some plants of Umbelliferae   the leaf is highly incised but there is practically no lamina formation so that only green stalks are present. Te queremos dar las mejores opciones para darle a esas paredes vacías mucha vida. Not every species produces leaves with all of these structural components. Disclaimer Copyright, Share Your Knowledge (vii) A leaf has three main parts – Leaf base, petiole and leaf lamina. The very common Pteridophyte Marsilea quadri-foliata presents a quadrifoliate appearance  although the actual morphology of the four leaflets is not so simple. LAMINA has been designed to provide classical indicators of leaf shape (blade dimensions) and size (area), which are typically required for correlation analysis to biomass productivity, as well as measures that indicate asymmetry in leaf shape, leaf serration traits, … A structurally complete leaf of an angiosperm consists of a petiole (leaf stalk), a lamina (leaf blade), stipules (small structures located to either side of the base of the petiole) and a sheath. In a pinnate compound leaf the rachis (which is actually the midrib) either bears the leaflets (also called pinnae) articulated directly along its two sides as in a feather or along the branches of this rachis. This is known as parallel or striate venation. Lamina of the leaf (Blade) [ Botany] The lamina is the expanded portion or blade of a leaf and it is an above-ground organ specialized for photosynthesis. Botánica Leaf, una preciosa lámina decorativa con un sutil dibujo de estilo botánico, ideal para decorar tus estancias y conseguir un estilo romántico y con mucha serenidad. Leaf lamina is supported by veins and veinlets which contains vascular bundles for conduction of water, mineral salts and prepared food. Shoeing a number of strong veins (costas) which are. Lamina of the vertebral arch; Planar lamina, a two-dimensional planar closed surface with mass and density, in mathematics; Lamina face, a face sharing all edges, in computer graphics; A thin plate, sheet or layer, such as: Lamina (algae), a structure in seaweeds Basal lamina, a structure of a living cell; Nuclear lamina, another structure of a living cell It has been seen in connection with tendril climbers that various organs of the plant may be transformed into tendrils. Stem: part of the plant that carries the leaves. lamina" a blade or a thin plate ] Any thin, flat layer or sheet of membrane or other tissue. Among the pinnately incised types some leaves, like those of radish or mustard, show lobes which are irregularly incised. (16) Elliptical—like an ellipse as in Vinca rosea, guava and India-rubber. This is called perfoliate   and is found in Aloe perfoliata, Pladera perfoliata, Bupleurum, etc. 2. a thin layer or coating lying over another, as in certain minerals. Photograph taken in the botanical garden of Munich, Bavaria, Germany. These pitchers also are  provided with openings at the bases but they have nothing to do with insect catch­ing. (i) The leaf is a lateral dissimilar appendage of the stem. Develop­ment of spinous structures is a feature of the xerophytes. Base: The base of the lamina is often notched and the two lobes of the lamina are extended downwards. The base of the lamina also is united and continuous with this so that the beginning of the lamina cannot be clearly demarcated. Another such pitcher is found in the epiphytic climber Dischidia rafflesiana (Asclepiadaceae) from Assam. Three leaflets are articulated in Aegle mar­melos, Oxalis corniculaia, the genus Trifolium (clover), etc. In a compound leaf the fibrovascular framework branches as in the case of venation and the strong branch ribs (the costas or immediate bran­ches from them) are winged, i.e., provided with lamina, forming leaflets. These are called lyrate  leaves. (With Methods)| Industrial Microbiology, How is Cheese Made Step by Step: Principles, Production and Process, Enzyme Production and Purification: Extraction & Separation Methods | Industrial Microbiology, Fermentation of Olives: Process, Control, Problems, Abnormalities and Developments. Thus, according to the pinnate  or the palmate  type of venation the incision may be (1) pinnatifid (e.g., poppy or chrysanthemum leaf); (2) pinnatipartite (e.g., Argemone mexicana); (3) pinnatisect (e.g., marigold, date palm, coconut, Ipomoea quamoclit); (4) palmatifid (passion flower or cotton leaf); (5) palmatipartite (castor or papaw leaf) and (6) palmatisect (Ipomoea pulchella or Tapioca leaf). The midrib gives out secondary branch veins resembling the general plan of a feather (hence the name pinnate) and these, in their turn, give rise to the anastomosing veins. Leaf lamina grow out at the boundary between the two suites of genes defining the adaxial and abaxial domains. The secondary veins often do not reach the margin but before reaching the edge either fizzle out or curve and run parallel to the margin for a short length. This is found in Balanites aegyptiaca of Simarubaceae, Hardwickia binnata of Papilionaceae, Campsis grandiflora of Bignoniaceae, etc. Muchos ejemplos de oraciones traducidas contienen “lámina” – Diccionario inglés-español y buscador de traducciones en inglés. Common examples are Portulaca oleracea (Portulacaceae), Basella rubra, Suaeda maritima and Salsola kali of Chenopodiaceae, Aloe and Agaves, Kalanchoe, Sedum acre (stone crop), etc. II. Structure of a leaf: chlorophyll containing outgrowth of a stem or branch; the site of photosynthesis. (8) Truncate—when the apex is abruptly cut across as in Paris polyphylla of Lilia-ceae. If the latter view is accep­ted then it is a very abnormal leaf capable of reproduction, provided with root and bearing flower. In a… Leafstalk (petiole): part of the leaf that is attached to the stem. (4) Gland-dotted—the presence and nature of glands (e.g., on lemon leaves) may be considered in connection with texture as well as in connection with lamina surface. Before sharing your knowledge on this site, please read the following pages: 1. In lemons and oranges (Citrus spp ), the prophyll is a spine. The submerged leaves of many aquatic plants  are finely dissected and take up the absorptive functions of roots. Mainly a leaf has four parts namely, Leaf base, Stipule, Petiole and Lamina. If dissection goes on still further even this connection disappears so that the lobes become completely independent of one ano­ther. (12) Obovate—reverse of ovate as in jack-fruit or Terminalia catappa. What is a mushroom shaped gland? Thus, a leaf, and most conspicuously its blade, is positioned directly under the blade two nodes above it. These plants are usually rootless. (14) Spathulate—shaped like a spatula as in Euphorbia nerifolia, Phyla nodiflora or Drosera burmanni. 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