4.2-A), mango, banyan, gold- molhur etc., the leaf base becomes distinctly swollen and forms a broadened cushion-like structure, the pulvinus, (Fig. 4 .2-C). distinguish between the two surfaces, such leaves are called centric or The sheathing leaf base encloses the stem for some distance above the node (Fig. (Fig. Compound leaf: Here the lamina is divided in to a number of leaf like lobes called the leaflets. (Fig. are structurally identical, hence they are called isobilateral.In some 4.2 E). 2001 Nov;17(4):245-52. doi: 10.1055/s-2001-18824.Facial Plast Surg. It is usually above the soil and develops from the plumule of the embryo of a germinating seed. not touch the midrib.When the incisions of the lamina reach up to the midrib breaking it into a number of leaflets, the leaf is called a compound.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.In a
(Fig. e.g.Mango . Before sharing your knowledge on this site, please read the following pages: banana, cannaSeveral parallel principal veins arise from the base of the lamina and converge towards the apex, e.g., Bamboo, Grass, etc.Several parallel principal veins arise from the base of the lamina and proceed towards the margins, e.g., Fan Palm (The veins branch dichotomously. The veinlets form reticulations. 4.5)The two stipules arising in between the petioles of two opposite leaves, e.g., Ixora, Anthocephalus etc.
Acuminate Coming to a sharp, narrow, prolonged point. It is the characteristic of monocot leaves except Smilax, Arisaema, and Dioscorea etc.In this type, lamina has a mid-rib in the centre. 2005 Jan;23(1):141-50, vii. Learn more about the types of incisions …
Some important examples are Zea mays, sugarcane, wheat, banana etc. In many plants, it is not demarcated from the petiole.
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. (Fig. 4.6).In some plants the stipules get modified into spines, e.g., Ziziphus, Barleria, Acacia etc.
(Fig. Usually one such stipules lies in each side of the petiole e.g Smilax(fig 4.11)The arrangement of veins and veinlets in the leaf lamina is called venation. This website includes study notes, research papers, essays, articles and other allied information submitted by visitors like YOU. The lateral veins run parallel to one another without forming anastomoses e.g. 2009 Sep;62(9):1223-6. doi: 10.1016/j.bjps.2008.02.015. Lateral veins come out perpendicular to the mid-rib, which run parallel to each other towards margin or apex of lamina; the lateral veins do not anastamose, e.g., Carina, Musa (Banana).Here, the lamina has numerous equally prominent veins arising from the tip of the petiole and running parallel towards the leaf apex or laminatnargin.In this type, all mid-veins run parallel to each other from the base of lamina and unite (converge) at the apex, e.g., Bamboo Rice, grass, Eichornia etc.In this type the main veins arise from the tip ‘of the petiole and proceed (diverge) towards the margin of the leaf blade in a more or less parallel manner as in fan palms such as palmyra palm.A leaf is said to be simple when it consists of a single blade which may be entire or incised (and, therefore, lobed) to any depth, but not down to the mid-rib or the petiole. In this article, we shall very important of a plant, the leaf.The leaf is lateral, generally flattened structure borne on the stem.
The most prominent vein present in the middle of lamina running from its base to apex is called mid rib. 4.2-1) Polygonum etc.In some plants petiole and leaf base, both become broad, Hat and winged. Long thin flexible When the incisions of the lamina reach up to the midrib breaking it into a number of leaflets, the leaf is called a compound. The main functions of the lamina are photosynthesis and transpiration.In dicots, 4. Leaves with petiole are known as petiolate, while those without petiole are called sessile (e.g., rice, wheat etc.). Cuneate Wedge-shaped. 4.4).Sometimes the two lateral stipules grow along the petiole and remain adnate to it giving the petiole winged appearance e.g., rose, Arachis hypogea (ground nut) etc. This sheathing leaf base is of frequent occurrence among monocotyledons. (Fig. 4.8)Sometimes, the stipules take the shape of green, leafy structures, such as in pea. onion, garlic, etc.The arrangement of veins and the veinlets in the lamina of a leaf is termed as venation. the midrib produces secondary axes which bear the leaflets, it is said to be bipinnate, as in dwarf gold mohur (Caesal-pinia), gum tree (Acacia), sensitive plant (Mimosa), etc.When the leaf is thrice pinnate, i.e. Cordate Heart-shaped with the notch towards the stalk. There is, usually, a middle prominent vein, which is known as the midrib. Pinnately compound leaves . Reniform Kidney-shaped but rounder and broader than long. When these stipules are present, the leaf is said to be stipulate and when absent exstipulate. doi: 10.1016/j.det.2004.08.006.Field LM, Ostertag J, Krekels G, Sneets N, Neumann H.J Plast Reconstr Aesthet Surg. The leaflets are borne on a common axis and they do not bear any axillary buds in their axils.
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