Bipinnate compound leaf : In this type, the primary rachis is divided once and produce secondary and tertiary rachis. We have seen above that the sheathing base is only a part of the leaf-base the other part is included in the axis as its axial component. 1A. Herbaceous : When the lamina is thin and soft. One of our academic counsellors will contact you within 1 working day. e.g., Acacia auriculae formis. Circinate – When the leaf is rolled from the apex towards the base like the tail of a dog, as in ferns. Create your Smart Home App in the Free Webinar on Home Automation. 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.Not every species produces leaves with all of these structural components. It is a photosynthetic organ. This sheathing leaf base is of frequent occurrence among monocotyledons. Leaf blade base shape the base of the leaf blade is cuneate (wedge-shaped, tapers to the base with relatively straight, converging edges), or narrow the base of the leaf blade is truncate (ends abruptly in a more or less straight line Such plant develop phyllodes to carry out photosynthesis e.g., Acacia, Melanoxylon and Parkinsonia. FAQ's | Scanning electron micrographs (SEMs) of (c) tobacco and (d) maize shoot apices reveal that, in monocots, the sheathing leaf base … It is of following types : Unipinnate compound leaf : Here the primary rachis is unbranched and bear leaflets on either side. Hispid : Covered with long rigid hair. Intelligent technologies have become part of the drive to modernize agriculture, liberate manpower and improve production efficiency. Franchisee | Leaf base contain 2 lateral outgrowth called stipules & leaf containing them is called stipulate leaf. The leaf and its base are further reduced in P. coronopus and P. pumila which have unilaeunar nodes. e.g., Jamun, Guava, etc. Answer: Petiole is the bridge between leaf and stem. Leaf base not sheathing but stipules present, occasionally ± fused distal to node Position on a stem from which one or more structures (especially leaves, buds, branches, or flowers) arise. (5) Vernation : Arrangement of leaves in bud condition is known as vernation imbricate (irregular overlapping), contorted (twisted, regular overlapping of margins), induplicate (margin bent inwardly), equitant (conduplicate in two series, one overlapping the other completely), half equitant, supervolute (convolute leaves, one rolled over other). Biology An enveloping tubular structure, such as the base of a grass leaf that surrounds the stem or the tissue that encloses a muscle or nerve fiber. Costa strong, abaxially convex, up to 290 µm wide in leaf base, up to 153 µm wide in leaf blade. Moreover, the vein structure is striated and each node contains only one leaf. Tutor log in | Hairy stipules : These are hair like stipules which are dry in nature, e.g., Anacampsora. (x) Trap leaves : The trap leaves are also called insectivorous leaves or carnivorous leaves. Latouria the sheathing leaf base has become developmentally fused to the pseudobulb then the unusual origin of the inflorescence apparently below a node would be explicable. in central Oregon.....April 8, 2007. Spinous : In some plants the stipules are modified into hard, pointed defensive organs called spines, e.g., Acacia arabica, Prosopis juliflora and Zizyphus. The sheathing leaf base encloses the stem for some distance above the node (Fig. (v) Storage leaves : Leaves become fleshy due to storage of water or food materials. Leaf base is sheathing in (1) Wheat (2) Maize (3) Grass (4) All of the above Answer: (4) Generally leaf base, petiole, and lamina, together form the main parts of a leaf. Plants having trap leaves usually grow in nitrogen-deficient soils (boggy soils). A. A leaf with a petiole is called petiolate and the one without it is called sessile. Midrib modified into tendril, e.g., Nepenthes. The more or less rectangular cell rows at the margins of the leaf base appear as a hyaline zone that narrows towards the broadest part of the leaf. 1945-12-01 00:00:00 Botany Department, Queen Mary College, University of London (With 6 figures in the text) According to Sinnott (1914), the Epacridaceae are … In Perkinsonia, Acacia and Zizyphus stipules modified into spines. - The green photosynthetic leaves of a plant are collectively called foliage. Interestingly, in some species such as D. terrestre and D. rigidifolium the short free leaf bases that can be seen below the abscission layer … Fig. e.g., Sorghum, Wheat and Palms. (vii) A leaf has three main parts – Leaf base, petiole and leaf lami… To read more, Buy study materials of Morphology of Flowering Plants comprising study notes, revision notes, video lectures, previous year solved questions etc. The ZIP System is a structural sheathing intended for walls and roofs, with an OSB base and WRB (weather resistive membrane), which is basically a mesh that is attached to an OSB sheathing panel with a paint applied. askiitians. Also browse for more study materials on Biology here. (iii) Developmental heterophylly : Young leaves are different from mature leaves, e.g., Eucalyptus. Fungus on a Hibiscus. e.g., Begonia, Acalypha and Sycamore. Decompound leaf : Here the primary rachis divides many times without any definite order. A leaf gap is an area along the stem where phloem and xylem diverge from the ... veined leaves with clasping/sheathing leaf bases. Phyllon = leaf; taxis = arrangement). Register yourself for the free demo class from (6) Heterophylly : It is the occurrence of more than one type of leaves on the same plant. (F, N) Sheathing stipules giving rise to colleters. (d) Stipule : The stipules are the small lateral appendages present on either side of the leaf base. e.g., Nerium, Hydrilla and Alstoni scholaris. The leaf is attached to the stem by the leaf base (hypo-podium) and may bear two lateral small leaf-like structures called stipules. Kinds of stipules are the small lateral appendages present on either side, margin, apex, and! Also browse for more study materials on Biology Here land animals like petiole ( ). P. coronopus and P. pumila which have unilaeunar nodes it has no and. In simple umbels or heads ( spikes or racemes ) ; fruit central axis not obvious 2 and! Into spines leaf-like structures called stipules together form the main vein plants having trap leaves: the of. 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