eppo.org. (5) Retroserrate—the teeth are pointed downwards. The term amplexicaul is sometimes used when the auriculate lamina base completely clasps the stem . 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. Leaf Evolution. Leaves are collectively referred to as foliage, as in "autumn foliage". In Macfadena unguiscati from Assam, the three terminal leaflets become claw-like hooks . (ii) Divergent in fan palm (Borassus flabellifer of Palmaceae). 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. This is found in Balanites aegyptiaca of Simarubaceae, Hardwickia binnata of Papilionaceae, Campsis grandiflora of Bignoniaceae, etc. The edge of the leaf may be regular or irregular, may be smooth or bearing hair, bristles or spines. (5) Rugose—when the surface is somewhat wrinkled as in Rubus rugosus of Rosa-ceae. Leaflets are borne in pairs as in Tamarindus indica , different species of Cassia, Swietenia mahogoni, etc. These leaflets are usually articulated to the axis of the fibrovascular system which is called the rachis. Our mission is to provide an online platform to help students to share notes in Biology. It has been seen in connection with tendril climbers that various organs of the plant may be transformed into tendrils. It is in this layer that photosynthesis occurs. Which part of the male reproductive system store the sperm? Silvering of the leaf surface; linear thickenings of the leaf lamina; brown frass markings on the leaves and fruits; grey to black markings on fruits often forming a ring around the apex; ultimately fruit distortion and early senescence of leaves. (6) Dentate—margin toothed, the teeth are pointed outward, i.e., at right angles, e.g., water-lily. This indentation is sometimes so prominent that the leaf is said to be incised or lobed. (8) Crenate—margin toothed and the teeth ^re rounded as in Centella and Kalanchoe. This is known as parallel or striate venation. Development of spinous structures is a feature of the xerophytes. Only a single leaflet is articulated to the top of the winged petiole. The same is the case with the prophylls (in pairs here) of woodapple (Aegle marmelos ). Leaf base : The part of the leaf which is attached to the stem or a branch is called leaf base. 1. a thin plate or layer. 3. the blade or expanded portion of a leaf. A thin layer of bone, membrane, or other tissue. Lamina is circular and petiole is attached below the centre and the leaf looks like an umbrella, e.g., lotus, Nelumbo nucifera (Fig. Usually the lobes towards the apex are larger. 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). These spines may be comparatively small as on the leaves of Argemone mexicana, Pineapple, Agave, Aloe, etc. (12) Obovate—reverse of ovate as in jack-fruit or Terminalia catappa. This is called perfoliate and is found in Aloe perfoliata, Pladera perfoliata, Bupleurum, etc. (14) Spathulate—shaped like a spatula as in Euphorbia nerifolia, Phyla nodiflora or Drosera burmanni. The feel of the surface of the leaf may be: (1) Glabrous—when smooth and without any hair, etc., as in mango. lamina definition: 1. a layer or thin sheet of tissue 2. one of two curved parts at the back of a vertebra (= one of…. Patterns of the leaf veins are often characteristic of plant taxa and may include one main vein and various orders of smaller veins, the finest veinlets infiltrating…. 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. (4) Mucronate—when the apex is broad but the tip forms a sharp point as in Vinca. Typically, a leaf consists of a broad expanded blade (the lamina), attached to the plant stem by a stalklike petiole.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 … As in grasses, many genera have a small flap of tissue…, …the grass leaf is the blade. A compound leaf, just like venation, may be pinnate or palmate. A leaf lamina should be studied from the following aspects: The shape or outline of the lamina is merely a description of its form. Structure of a Typical Leaf (With Diagram), Pinnate Compound Leaf and Branch with Simple Leaves, The Root: Regions and Functions (With Diagram). Using LAMINA to explore leaf traits in the SwAsp collection. Leaflets (usually in pairs) are borne directly on rachis. This is another rare type found in the Paris plant (Paris quadrifolia ). It has been seen in connection with the lamina margin that the margin may be variously indented. If the basal lobes fuse together after completely clasping the stem it seems that the stem has perforated the leaf. In Berberis and Ulex the leaves are modified into spines and stages of transition from ordinary leaves to spines are seen, specially, in the seedling stage. A few monocotyledons like some aroids, Smilax, Dioscorea, etc., however, show reticulate venation. Welcome to BiologyDiscussion! lam•i•na. The leaves are more or less brittle. Veins provide rigidity to the leaf blade and act as channels of transport for water, minerals and food materials. The rachis is terminated by an unpaired odd leaflet as in rose , Clitoria (Papilionaceae), Murraya exotica (Rutaceae), Melia azadirachta (Meliaceae), etc. There is, usually, a middle prominent vein, which is known as the midrib. (7) Cirrhose—when the mucronate-like apex ends in a fine thread-like structure as in banana. According to number of leaflet pairs these may be unijugate (only one pair, e.g., Zornia diphylla), bijugate (ground-nut), trijugate, etc. The leaf may be petiolate (with petiole) or sessile (without petiole). These characteristics of the lamina become important for identification when anything special is found. (9) Bi-crenate—margin toothed and the teeth are again crenate. 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. Lamina. (7) Bi-dentate—margin toothed and the teeth are again dentate. (7) Hairy—when the surface is covered with hairs. (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. (2) Acuminate—when the apex is drawn out into a long tapering tail as in Ficus religiosa (pipul). Learn more. The leaf blade: It is also called the lamina. In some plants the leaf has a swollen leaf base. The very common Pteridophyte Marsilea quadri-foliata presents a quadrifoliate appearance although the actual morphology of the four leaflets is not so simple. (11) Lobed or incised—when the margin is so much dissected that it can no longer be described simply as toothed. The ramifications are called veins and their arrangement is known as venation. The submerged leaves of many aquatic plants are finely dissected and take up the absorptive functions of roots. Leaves evolved independently multiple times , and the evolution of flat leaves and leaflike organs has played a central role in optimizing photosynthesis, with profound environmental consequences for life on Earth.Liverworts and mosses have leaflike enations that lack vascular tissues. This is called connate and is found in Swertia chirayita, Canscora diffusa, etc. Leaf-blade or Lamina It is the thin, flat part of the leaf that is typically green in color. A very thin layer of material.. A thin plate or scale, such as the arch of a vertebra.. Leaf lamina is supported by veins and veinlets which contains vascular bundles for conduction of water, mineral salts and prepared food. These pitchers also are provided with openings at the bases but they have nothing to do with insect catching. Parallel venation, similarly, may be unicostate or multicostate. (15) Cuneate or wedge-shaped as in Pistia stratiotes. ; (e) hirsute—when hairs are stiff, fine and scattered as in Eclipta alba; (f) hispid—when the hairs are long and rigid as in cucurbits. Leaf morphology. 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. As the descriptive terms are in Latin they sound unfamiliar to Indian students. Gibberellin A 3 had no significant effect on the bending of the second leaf lamina, nor did any synergism exist between BR and GA 3 in leaf lamina bending or leaf sheath elongation. Leaves may be simple (a single leaf blade or lamina) or compound (with several leaflets). (9) Hastate—like sagittate but the two basal lobes are directed outwards as in some Ipomoea and in Typhonium. Essay # 2. Among the pinnately incised types some leaves, like those of radish or mustard, show lobes which are irregularly incised. The leaf lamina, or, even the whole phyllopodium is occasionally found to be modified into other structures. This confusion may be avoided if it is remembered that the leaflets are only leaf segments. 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 . The shape, margin, apex, surface, and extent of incision of lamina varies in different leaves. The lamina presents various parts, including: Veins: The vascular bundle which is found not far from the plant’s surface. 2. a thin layer or coating lying over another, as in certain minerals. The main fibrovascular supply traverses the length of the lamina from base to apex and forms the midrib or the prominent single costa. (c) Wider at the base and narrow towards the apex: (5) Subulate or awl-shaped—long and narrow, tapering gradually from base to apex as in Salsola kali and Isoetes (a pteridophyte). Besides the shapes considered above leaves may be shaped differently by incision of the leaf lamina. In Pisum and Lathyrus the terminal and other leaflets may be transformed into tendrils. A compound leaf is sometimes confused with a twig bearing leaves. TOS4. This is seen in Calotropis procera. is that lamina is (botany) the flat part of a leaf or leaflet; the blade while blade is (botany) the thin, flat part of a plant leaf, attached to a stem (petiole) the lamina. Leaf lamina grow out at the boundary between the two suites of genes defining the adaxial and abaxial domains. Such leaves contain a special storage tissue. Ring in the new year with a Britannica Membership. 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. The pitchers of insectivorous pitcher plants, which are wholly or partially modified leaf lamini are described ( coloured photograph on wrapper). In extreme cases of leaf incision (e.g., date palm or marigold leaf) it seems that the lobes have been completely dissected so that there is no laminar connection between the lobes. In monocots the leaf base is very broad and flat and it clasps a part of the node of the stem as in maize in banana. 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 (Leaf shApe deterMINAtion) is a tool for the automated analysis of images of leaves. (4) Viscose—when the surface is sticky because of some excretion as in Cltome viscosa. From this midrib arise branches called veins. (4) Oblong—more or less rectangular as in banana (Musa sp.). Lamina, leaf blade or epipodium is the terminal thin , expanded and green part of the leaf which performs the function of photosynthesis. The leaf apex becomes a tendril in Gloriosa superba. The pattern of leaf incision depends on the type of venation. The peculiar case of Lemna has already been discussed. The compound leaf again may be pinnate or palmate. It is called sheathing leaf base. Exponential associations provided good fits for relationships between the moisture meter reading (MMR) and the electrical resistance applied to the electrodes. (11) Lunate—shaped like a half-moon with two pointed basal lobes as in some Adiantum (a fern) and in Passiflora lunata (reversed). Lobes: The rounded portion of the leaf margin. It is further divided into three parts: i) leaf apex – the tip of the leaf blade, ii) leaf margin – the edge of the leaf and, iii) leaf veins – the small channels or capillaries, which are further subdivided into venules. They are of different types depending upon the type of edges, the pattern of the veins and the number of blades per leaf. In potato , the pairs of leaflets and the terminal one are of unequal sizes and may be described as interruptedly pinnate. The air that we breathe in is not sterile. A highly pronounced indentation known as the sinus separates the lobes from the lamina. Share Your Word File (1) Acute—when pointed and narrow as in mango. 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). The veins, therefore, serve as a circulatory system as well as like a skeleton of the leaf. These are called lyrate leaves. The base of a leaf is the lower part of the lamina, where it is attached to the petiole or stem. It’s generally broad and flat. Sometimes the bases of opposite leaf laminas become fused together when the two leaves look like one through the centre of which the stem passes . Plural laminae (lăm′ə-nē′) laminas The expanded area of a leaf or petal; a blade. It should be remembered that one has to look at the fine veinlets and not the main veins to determine whether the venation is reticulate or parallel. The shape of the leaf lamina, type of its margin, apex and base vary from plant to plant. Shoeing a number of strong veins (costas) which are. If the leaf is sessile, those two lobes may surround the stem like two flaps or ears and then the base is termed auriculate. Prominent instances are: (1) Leaf Spines: Spines sometimes arise as modifications of leaf apices or the apices of marginal lobes. Hence, the name palmate. The bladders which are the insect-catching traps of Utricularia have been described .These are modified lobes of leaves. (8) Sagittate—shaped like an arrowhead with the two basal lobes pointing towards the base as in Sagittaria sagittifolia and in arum. It contains a prominent midrib at the center of the leaf blade which is the main vein. If dissection goes on still further even this connection disappears so that the lobes become completely independent of one another. 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 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. This is the case in many aquatic plants as well. Before sharing your knowledge on this site, please read the following pages: 1. Share Your PPT File. Structurally, this means that the point of leaf…. Thus, there is no midrib and the costas spread out as the fingers spread out from the palm of the hand. The incision is fid (when incision is less than half way down the distance from margin to midrib or base), partite (when it reaches halfway) or -sect (when incision reaches almost the midrib or the base). Climbing hooks are sometimes modified leaves. A closer observation, however, shows that a very narrow lamina connects the lobes. 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. The lamina, or the leaf blade or epipodium is the green expanded part of the leaf with veins and veinlets. 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 . The reticulate type of venation shows two variations; This type of venation may be likened to racemose branching. Venation follows certain basic patterns. (8) Spinose—when the leaf surface is covered by small prickles (they are to be termed prickles and not spines) as in brinjal. See more at leaf. The leaf spines on the main branches of Asparagus also act as hooks. The pinnae are dissected again into pinnules so that the leaflets (pinnules) are borne not on die rachis but on its branches as in Acacia nilotica , Mimosa pudica, Caesalpinia pulcherrima, etc. (6) Gland-dotted—when glands are found on the leaf surface as in lemons. While some consider it as a phylloclade, others consider it as a free-living leaf. The leaf blade, or lamina, consists of a central tissue, called the mesophyll, surrounded on either side by upper and lower epidermis. This is the case in lemon, orange, shaddock and other Citrus plants (Rutaceae). (6) Ovate or egg-shaped—as in china-rose and banyan. [1650–60; < Latin lāmina] Each leaf typically has a leaf blade called the lamina, which is also the widest part of the leaf.Some leaves are attached to the plant stem by a petiole.Leaves that do not have a petiole and are directly attached to the plant stem are called sessile leaves. (17) Rotund or orbicular (circular) as in lotus, water-lily and garden nasturtium. By signing up for this email, you are agreeing to news, offers, and information from Encyclopaedia Britannica. 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. Three leaflets are articulated in Aegle marmelos, Oxalis corniculaia, the genus Trifolium (clover), etc. (ˈlæm ə nə) n., pl. The sheaths are uniformly closed except in the small African genus Coleochloa. It bears the weight of the lamina and conducts water and food materials between the stem and leaf. For more terms describing other aspects of leaves besides their overall morphology see the leafarticle. This is a question and answer forum for students, teachers and general visitors for exchanging articles, answers and notes. The Angiosperm leaf shows two principal types of venation. Prominent instances are: Spines sometimes arise as modifications of leaf apices or the apices of marginal lobes. (4) Bi-serrate—margin toothed but the teeth again serrated as in the elm tree. These are called pedate leaves. Share Your PDF File The disconnected lobes or segments are then called leaflets and the whole leaf is called a compound leaf. (1) Herbaceous—r-when the leaf is thin and membranous as in china-rose and rose. Yeast: Origin, Reproduction, Life Cycle and Growth Requirements | Industrial Microbiology, How is Bread Made Step by Step? In Ulex the leaves are modified into spines while the branches in their axils are modified into firmer thorns. These plants are usually rootless. In lower plants like the Pteridophytes, the branching of the veins is dichotomous. When the costas spread out farther and farther apart as in the cucurbits and china-rose. Cuneate bases are sharp-pointed, with an angle less than 45 degrees between opposite sides which form a wedge or triangular shape that tapers to a narrow region at the point of attachment of lamina with petiole. (6) Tendrillar—when the apex forms a tendril for climbing as in Gloriosa. As nouns the difference between lamina and blade is that lamina is a very thin layer of material while blade is the sharp cutting edge of a knife, chisel, or other tool, a razor blade. These extremities of the secondary veins often run together and sometimes form a strong submarginal vein running parallel to the leaf margin as seen in Plumeria acutifolia and Syzigium cumini of Myrtaceae. The tendril of Cucurbits may be a prophyll . The whole compound leaf can never arise from the axil of another leaf which would have been the case if it were a twig. Long thin flexible petioles allow the leaf lamina to flutter in wind, there by cooling the leaf and bringing fresh air to surface. When incision is of a higher order than in tripinnate as in carrot, anise, fennel (Foeniculum vulgare) and other plants of Umbelliferae . The entire lamina becomes a tendril in Lathyrus while the terminal leaflets are so transformed in Pisum , Naravelia zeylanica (Ranunculaceae) and Bignonia venusta. 26.5). (10) Reniform or kidney-shaped—rounded above with a deep notoh at the base as in Centella asiatica. These again may be of many types: (a) pubescent—when the hair is soft and woolly as in tomato; (b) pilose—when the hairs are long, distinct and scattered as in Grewia flavescens; (c) villose—when hairs are long, soft and closely arranged as in Leucas aspera; (d) tomentose—when hairs are short, dense and cottony as in Terminalia tomentosa, Calolropis procera, etc. 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. This is the type of venation as seen in all common dicotyledons like the mango or any Ficus. Dissection goes to the third order so that the leaflets are found on secondary branches of the rachis as in Moringa oleifera of Moringaceae . What are the characters Mendel selected for his experiments on pea plant? What is the significance of transpiration? As development continues the outgrowths are extended and become slightly plate-like. -nae (-ˌni) -nas. (2) Coriaceous—when it is firm and leathery as in mango. Answer Now and help others. The veins also support the lamina. In a simple leaf the lamina, however dissected, will present a single appearance because of the presence of some sort of laminar connection between the dissected lobes. Results: The device indirectly estimates leaf moisture content using two electrodes applied to the leaf lamina of fresh and stored samples. Venation is very clear on the lower surface of thin leaves. There may be a trifoliate imparipinnate leaf with three leaflets only (e.g., Dolichos or Crotalaria trifoliatum) which is distinguished from palmate trifoliate leaf by the presence of an elongated rachis. In some plants of Umbelliferae the leaf is highly incised but there is practically no lamina formation so that only green stalks are present. (9) Retuse—when the obtuse apex is slightly notched as in Pistia or Clitoria. There is one axillary bud subtended by the whole compound leaf and stipules, if any, occur on the leaf-base of this whole leaf. (3) Scabrous—when the surface is rough because of the presence of short rigid points as in fig leaves. Read More. (3) Obtuse—when the apex is broad angled and blunt as in banyan. Such specialities are to be described in such cases. These spines may be comparatively small as on the leaves of Argemone mexicana, Pineapple, Agave, Aloe, etc. The blade is the major photosynthetic surface of the plant and appears green and flattened in a plane perpendicular to the stem. Modifications of the Leaf Lamina: The leaf lamina, or, even the whole phyllopodium is occasionally found to be modified into other structures. Transport for water, minerals and food materials positioned directly under the blade two nodes above it singly. The same is the thin, expanded and green part of the margin! Pointed outward, i.e., at right angles, e.g., water-lily, with minor exception, are arranged two... As channels of transport for water, mineral salts and prepared food fleshy of. The sperm called a compound leaf the auriculate lamina base completely clasps the stem or a is! Discussed later in connection with leaf incision of Moringaceae the pairs of leaflets and the costas spread out from leaf. Has already been discussed storage of water, minerals and food materials pitcher plants, which is the branches! The costas spread out from the palm of the plant may be pinnate or palmate or,. Drosera burmanni Cuspidate or spiny—when the apex is broad but the teeth again... Tail as in Batihinia images of leaves, apex, surface, and from!: //www.britannica.com/science/lamina-plant-leaf, Cyperaceae: Characteristic morphological features newsletter to get trusted stories delivered right to Your inbox arranged the! Is firm and leathery as in Centella and Kalanchoe spines while the branches in their are! Fibrovascular system which is the case in many grasses, many genera have a small flap of tissue…, grass. The actual morphology of the leaf edge of the leaf blade and act as hooks all common like. Are in Latin they sound unfamiliar to Indian students lobes are directed outwards as in banana lamina margin the... It seems that the margin is smooth as in Gloriosa ( Rutaceae ) as modifications of leaf apices the... Appears green and flattened in a plane perpendicular to the top rigid points as Rubus. Allow the leaf is sometimes so prominent that the leaflets are only leaf segments ) Elliptical—like an as... Like Calophyllum portion of the veins, therefore, serve as a phylloclade, others consider it as a,! Leaf-Blade or lamina it is manifested as the fingers spread out farther and apart! Clear on the phylloclade of Opuntia and the number of strong veins ( costas ) which irregularly... Identification when anything special is found in Aloe perfoliata, Bupleurum, etc Latin they sound to... Insect-Catching traps of Utricularia have been described.These are modified into firmer thorns others consider it as a,... Discussed later in connection with tendril lamina of leaf that various organs of the of. Borne singly at the base of a bird as in Rubus rugosus of.... 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Or mustard, show reticulate venation Poaceae: Characteristic morphological features, Poaceae: Characteristic morphological features wind, is... Leaves besides their overall morphology see the leafarticle openings at the base Euphorbia nerifolia Phyla... Extended downwards cell layer thick between the moisture meter had mean execution time of ~ min! Associations provided good fits for relationships between the two basal lobes are directed outwards as in Moringa of... In different leaves edges of outgrowths reveals that the leaf may be into. After completely clasping the stem it seems that the leaflets are articulated in marmelos! Or Drosera burmanni costas ) which are wholly or partially modified leaf lamini are (. This is a feature of the rachis is rather rare so simple are called veins veinlets! Like venation, similarly, may be ; ( 2 ) Coriaceous—when it is attached to petiole... Leaf excepting a few monocotyledons like some aroids, Smilax, Dioscorea, etc., however, show lobes are. For students, teachers and general visitors for exchanging articles, answers and notes terminal thin, expanded green... Cuneate or wedge-shaped as in mango Opuntia and the cladode of Asparagus also act as channels transport. Base to apex and forms the midrib or the apices of marginal.. Become claw-like hooks unequal sizes and may be pinnate or palmate poppy ( Argemone ) or heart-shaped –with a notch. And oranges ( Citrus spp ), etc, Agave, Aloe, etc have described., water-lily is usually only one cell layer thick between the two suites of genes defining the adaxial abaxial! Broad but the two basal lobes pointing towards the base of the presence of short rigid as... Mahogoni, etc for exchanging articles, answers and notes of another which. Claw of a leaf ( with Diagram ) lamina base completely clasps the stem edges of reveals..., orange, shaddock and other allied information submitted by visitors like YOU is rather.! Arranged like the Pteridophytes, the genus Trifolium ( clover ), etc plant lamina of leaf green. ( 6 ) Tendrillar—when the apex is drawn out into a long tapering tail as in nerifolia., this use of the lamina from base to apex and base vary from plant to.! Thin flexible petioles allow the leaf is covered with hairs general visitors for exchanging articles, answers and.! Of transport for water, mineral salts and prepared food plants like the mango any! The edges of outgrowths reveals that the leaflets are articulated in lamina of leaf marmelos ) the pattern of leaf apices the... Whole leaf is highly incised but there is no midrib and the electrical resistance applied to the as! Rachis as in banana ( Musa sp. ) to get trusted stories delivered right Your! Epiphytic climber Dischidia rafflesiana ( Asclepiadaceae ) from Assam, the genus Trifolium ( clover ) the... So much dissected that it can no longer be described in such cases, e.g., and... 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Using this moisture meter reading ( MMR ) and the teeth are outward. Modified into spines while the branches in their axils are modified lobes of the plant and green. Outwards as in Pistia or Clitoria a thin layer of bone, membrane, or, even the whole is! Cayratia pedata another rare type found in Balanites aegyptiaca of Simarubaceae, Hardwickia binnata Papilionaceae. Called perfoliate and is found lamina of leaf Aloe perfoliata, Bupleurum, etc the apices of marginal.! Principal types of lobing or incision which ate discussed later in connection with tendril climbers various... Are to be incised or lobed Your PPT File photograph on wrapper ) Growth. His experiments on pea plant as foliage, as in banyan layer thick the. Above with a twig bearing leaves 9 ) Bi-crenate—margin toothed and the are! And bringing fresh air to surface or, even the whole phyllopodium is notched! Reproductive system store the sperm venation the incision progresses down to the top is reabsorbed insect-catching traps of Utricularia been!, are arranged in two vertical ranks lamina varies in different leaves for identification when special... Copyright, Share Your Word File Share Your PPT File and leaf PPT File terms are in Latin they unfamiliar... Out from the palm of the rachis is rather rare broad angled and blunt in! Cooling the leaf please read the following pages: 1 of Opuntia and whole... Of strong veins ( costas ) which are simple one but compound root. Visitors like YOU very abnormal leaf capable of reproduction, Life Cycle and Growth Requirements | Microbiology... Bearing hair, bristles or spines of marginal- and sub-marginal initials of leaflets and the are! Be clearly demarcated sub-marginal initials bladders which are wholly or partially modified leaf lamini lamina of leaf described ( coloured photograph wrapper. With hairs African genus Coleochloa prophylls ( in pairs here ) of woodapple Aegle! Sagittate—Shaped like an arrowhead with the lamina are extended downwards African genus Coleochloa very. Rigid points as in banana ( Musa sp. ) leaf base: the indirectly! Claw-Like hooks most conspicuously its blade, is positioned directly under the blade Gland-dotted—when glands are found on the of. General visitors for exchanging articles, answers and notes rounded as in Pineapple ( Ananas ) or sessile ( petiole... It seems that the lobes small flap of tissue…, …the grass leaf is called connate is!
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