Disponible en 21x30cm, 30x40cm y 50x70cm, ¡te encantará decorar con ella! Midrib-The petiole enters into the lamina of the leaf and continues as the mid rib. What is its function? 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 (4) Oblong—more or less rectangular as in banana (Musa sp.). Be on the lookout for your Britannica newsletter to get trusted stories delivered right to your inbox. (1) Herbaceous—r-when the leaf is thin and membranous as in china-rose and rose. (8) Truncate—when the apex is abruptly cut across as in Paris polyphylla of Lilia-ceae. Here, we report the identification of STENOFOLIA (STF), a WUSCHEL-like homeobox … (5) Retroserrate—the teeth are pointed downwards. (6) Gland-dotted—when glands are found on the leaf surface as in lemons. The articulation shows that the leaf is not a simple one but compound. Rain water as well as debris accumulate within these vessels and this water is absorbed by adventitious roots which grow out from the stem nodes and ramify within the cavities . We have developed LAMINA (Leaf shApe deterMINAtion), a new tool for the automated analysis of images of leaves. 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. (2) Acuminate—when the apex is drawn out into a long tapering tail as in Ficus religiosa (pipul). Photograph taken in the botanical garden of Munich, Bavaria, Germany. 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. Figure 10: Transections of various leaf types showing principal direction of development. The base of the lamina also is united and continuous with this so that the beginning of the lamina cannot be clearly demarcated. The pitchers of insectivorous pitcher plants, which are wholly or partially modified leaf lamini are described ( coloured photograph on wrapper). (7) Bi-dentate—margin toothed and the teeth are again dentate. Structure of a Typical Leaf (With Diagram), Pinnate Compound Leaf and Branch with Simple Leaves, The Root: Regions and Functions (With Diagram). A compound leaf is sometimes confused with a twig bearing leaves. These spines may be comparatively small as on the leaves of Argemone mexicana, Pineapple, Agave, Aloe, etc. The leaf apex becomes a tendril in Gloriosa superba. (9) Retuse—when the obtuse apex is slightly notched as in Pistia or Clitoria. In monocotyledons; on the other hand, the main veins tend to run parallel to one another and are connected laterally by transverse vein-lets which are unbranched and are parallel to one another. The presence and persistence of water on the leaf lamina is a phenomenon that can be more or less evident and can affect crop performance. Lámina impresa sobre … Thus, a leaf, and most conspicuously its blade, is positioned directly under the blade two nodes above it. The whole phyllopodium is often transformed into spine as on the phylloclade of Opuntia and the cladode of Asparagus . What is the significance of transpiration? (10) Emarginate—when the obtuse apex is deeply notched as in Bauhinia. The sheaths are uniformly closed except in the small African genus Coleochloa. The sori are positioned at the tips or along the margins of the leaf segments and are enclosed in a cup-shaped to narrowly conical protective covering of tissue (indusium) opening toward…, …a broad expanded blade (the lamina), attached to the plant stem by a stalklike petiole. As liquid moves through the leaf lamina, from entry at the petiole–lamina junction to the sites of evaporation, its flow rate at a given water potential difference depends on the lamina hydraulic conductance (Klamina). Grass leaves are borne singly at the nodes and, with minor exception, are arranged in two vertical ranks. …and are characterized by a lamina (leaf blade) that is usually only one cell layer thick between the veins. In lower plants like the Pteridophytes, the branching of the veins is dichotomous. Lamina The type of a leaf is usually monomorphic and characteristic of a species. The fibrovascular tissue system supplying a leaf reaches the base of the lamina through the petiole and from this point it branches out or ramifies according to certain patterns. (7) Cordate or heart-shaped –with a deep notch at the base as in betel vine (Piper betle). This indentation is sometimes so prominent that the leaf is said to be incised or lobed. The disconnected lobes or segments are then called leaflets and the whole leaf is called a compound leaf. 1. a thin plate or layer. Palmate venation, again, may be: when the prominent veins (costas) after spreading out from the base again converge towards the-tip of the lamina as in Zizyphus jujuba of Rhamnaceae and in the cinnamon leaf (Cinnamomum tamala ). Petiole- It is also known as the leaf stalk. These are […] (8) Sagittate—shaped like an arrowhead with the two basal lobes pointing towards the base as in Sagittaria sagittifolia and in arum. The leaves are more or less brittle. 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. 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, … 3. the blade or expanded portion of a leaf. The lamina is the expanded, flat component of the leaf which contains the chloroplasts. As opposed to these compound leaves showing an extreme type of dissection, the ordinary entire or incised (including even the -sect types) leaves are known as simple leaves. Climbing hooks are sometimes modified leaves. Navigate parenthood with the help of the Raising Curious Learners podcast. Hence, the name palmate. The proximal stalk or petiole is called a stipe in ferns. Leafstalk (petiole): part of the leaf that is attached to the stem. Leaf base- The basal part of the leaf by which it is attached to the stem at the node is called 'leaf base'. De estilo casual y moderno. Parts of Leaf 5. Venation follows certain basic patterns. Share Your PDF File The peculiar case of Lemna has already been discussed. (9) Hastate—like sagittate but the two basal lobes are directed outwards as in some Ipomoea and in Typhonium. This website includes study notes, research papers, essays, articles and other allied information submitted by visitors like YOU. Name the types of nitrogenous bases present in the RNA. Leaves are, however, quite…, The leaf blade, or lamina, consists of a central tissue, called the mesophyll, surrounded on either side by upper and lower epidermis. Usually the lobes towards the apex are larger. Results. In this type the vascular supply, after reaching the base of the lamina, breaks up into a number of equally strong veins or costas. It may be a part of a larger structure. In lemons and oranges (Citrus spp ), the prophyll is a spine. If the leaf is sessile, those two lobes may surround the stem like two flaps or ears and then the base is termed auriculate. (12) Obovate—reverse of ovate as in jack-fruit or Terminalia catappa. (17) Rotund or orbicular (circular) as in lotus, water-lily and garden nasturtium. (ii) Divergent in fan palm (Borassus flabellifer of Palmaceae). 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. If dissection goes on still further even this connection disappears so that the lobes become completely independent of one another. The main fibrovascular supply traverses the length of the lamina from base to apex and forms the midrib or the prominent single costa. Venation is very clear on the lower surface of thin leaves. If there be more than four leaflets as in the silk- cotton tree (Bombax ceiba of Bombacaceae ), Cleome viscosa and Cleome gynandra of Capparidaceae, horse chestnut (Aesculus hippocastanum), etc. (4) Mucronate—when the apex is broad but the tip forms a sharp point as in Vinca. …have sheathing leaves, usually with blades; but members of a substantial number of genera, including Caustis, Eleocharis, Lepironia, Schoenoplectus, and Trichophorum, may be bladeless or nearly so. If the latter view is accepted then it is a very abnormal leaf capable of reproduction, provided with root and bearing flower. 3. (6) Dentate—margin toothed, the teeth are pointed outward, i.e., at right angles, e.g., water-lily. Plural laminae (lăm′ə-nē′) laminas. The appearance of leaves with flattened laminae about 400 million years (Myr) ago had broad impacts on the Earth’s ecosystem. Answer Now and help others. (6) Tendrillar—when the apex forms a tendril for climbing as in Gloriosa. 4. (13) Obcordate—reverse of cordate with an apical notch as in Batihinia. A few monocotyledons like some aroids, Smilax, Dioscorea, etc., however, show reticulate venation. These are called lyrate leaves. Te queremos dar las mejores opciones para darle a esas paredes vacías mucha vida. Shoeing a number of strong veins (costas) which are. This is found in Balanites aegyptiaca of Simarubaceae, Hardwickia binnata of Papilionaceae, Campsis grandiflora of Bignoniaceae, etc. This is a question and answer forum for students, teachers and general visitors for exchanging articles, answers and notes. Content Guidelines 2. Lamina, leaf blade or epipodium is the terminal thin , expanded and green part of the leaf which performs the function of photosynthesis. This is called connate and is found in Swertia chirayita, Canscora diffusa, etc. (10) Reniform or kidney-shaped—rounded above with a deep notoh at the base as in Centella asiatica. Structure of a leaf: chlorophyll containing outgrowth of a stem or branch; the site of photosynthesis. (10) Spiny—the marginal teeth are pointed to form spines as in pineapple (Ananas) or Mexican poppy (Argemone). This is known as reticulate venation which is a characteristic of dicotyledonous leaf excepting a few like Calophyllum. Share Your PPT File. (7) Hairy—when the surface is covered with hairs. (vii) A leaf has three main parts – Leaf base, petiole and leaf lamina. (b) Wider but more or less of the same width at base and apex: (3) Lanceolate—shaped like a lance as in Nerium and Polyalthia. The compound leaf again may be pinnate or palmate. It has already been seen that in the decurrent type the petiole as well as the leaf-base and a part of the stem are winged and united. 2. a thin layer or coating lying over another, as in certain minerals. This boundary is required not only for growth in the lateral direction but also for the leaf to increase in length by proximo-distal growth (Johnston et al., 2010). 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.For this purpose, a leaf is typically, to a greater or lesser degree, flat and thin, to expose the chloroplast containing cells (chlorenchyma) to light over a broad area, and to allow light to penetrate fully into the tissues. Structurally, this means that the point of leaf…. What is the world's most endangered animal? The term amplexicaul is sometimes used when the auriculate lamina base completely clasps the stem . When incision is of a higher order than in tripinnate as in carrot, anise, fennel (Foeniculum vulgare) and other plants of Umbelliferae . The Lamina (Epipodium) of A Leaf (With Diagram) ! 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