This is found in Balanites aegyptiaca of Simarubaceae, Hardwickia binnata of Papilionaceae, Campsis grandiflora of Bignoniaceae, etc. 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. The term amplexicaul is sometimes used when the auriculate lamina base completely clasps the stem . (v) The growth of leaf is limited. Let us study each of them. (iv) It is exogenous in originand develops from the swollen leaf primordium of the growing apex. (8) Sagittate—shaped like an arrowhead with the two basal lobes pointing to­wards the base as in Sagittaria sagittifolia and in arum. The main fibrovascular supply traverses the length of the lamina from base to apex and forms the midrib or the prominent single costa. The pattern of leaf incision depends on the type of venation. In some cases, the blade may not have any petiole in which case the leaf is called a sessile leaf A compound leaf is sometimes confused with a twig bearing leaves. Parallel venation, similarly, may be unicostate or multicostate. Not every species produces leaves with all of these structural components. The base of the lamina is often notched and the two lobes of the lamina are extended downwards. Such leaves contain a special storage tissue. Share Your PPT File. As a verb leaf is to produce leaves; put forth foliage. These spines may be comparatively small as on the leaves of Argemone mexicana, Pineapple, Agave, Aloe, etc. The leaves are more or less brittle. (3) Serrate—margin with teeth pointed upwards as in a saw, e.g., china-rose, rose, etc. Answer Now and help others. The leaf spines on the main branches of Asparagus also act as hooks. 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. (1) Entire—when the margin is smooth as in mango. In this type the vascular supply, after reaching the base of the lamina, breaks up into a number of equally strong veins or costas. The lamina is the expanded, flat component of the leaf which contains the chloroplasts. Shape of Lamina: The lamina shows much variation with regard to their shapes. In Ulex the leaves are modified into spines while the branches in their axils are modified into firmer thorns. 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). Shoeing a number of strong veins (costas) which are. These are […] A thin layer of bone, membrane, or other tissue. (2) Coriaceous—when it is firm and leathery as in mango. Essay # 1. A few monocotyledons like some aroids, Smilax, Dioscorea, etc., how­ever, show reticulate venation. ADVERTISEMENTS: Here is an essay on the ‘Lamina of a Leaf’ for class 9, 10, 11 and 12. The articulation shows that the leaf is not a simple one but compound. 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…. 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  . What is the world's most endangered animal? (vii) A leaf has three main parts – Leaf base, petiole and leaf lamina. 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