leaf petiole definition
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Definitions &Translations Petiole. In botany, the petiole is the stalk attaching the leaf blade to the stem. The petiole is the transition between the stem and the leaf blade, and usually has the same internal structure as the stem. Outgrowths appearing on each side of the petiole are called stipules.
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Leaf A leaf is an organ of a vascular plant and is the principal lateral appendage of the stem. The leaves and stem together form the shoot. Leaves are collectively referred to as foliage, as in autumn foliage.. Diagram of a simple leaf.
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- Leaf Tissue Organization. The plant body is divided into several organs: roots, stems, and leaves. The leaves are the primary photosynthetic organs of plants, serving as key sites where energy from light is converted into chemical energy. Similar to the other organs of a plant, a leaf is comprised of three basic tissue systems, including the dermal, vascular, and ground tissue systems.
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stipule Word Origin and History for stipule Expand n. small appendage at the base of the petiole of a leaf, 1793, from French stipule, from Latin stipula stalk (of hay), straw. Online Etymology Dictionary, © 2010 Douglas Harper Cite This Source stipule in Science Expand
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- Leaf Arrangement. The pattern of arrangement of leaves on the stem is called Phyllotaxy. As a stem grows at its apex, new leaf buds form along the stem by a highly controlled developmental process. Leaf arrangement along the plant stem depends on the species and is an important identifying characteristic. There are four basic types of Phyllotaxy. 1.
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What Is the Structure That Connects the Leaf to the Stem? Different Sizes. Petioles are various lengths, and some leaves lack petioles entirely. They are called sessile or stalkless leaves -- such as the leaves of wood lily (Trillium sessile), which is hardy in U.S. Department of Agriculture plant hardiness zones 4 through 8.
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- scape 1. n. 1. Botany A leafless flower stalk growing directly from the ground, as in the tulip. 2. Biology A stalklike part, such as a feather shaft or the first segment of an insect's antenna.
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Leaf A leaf is an organ of a vascular plant and is the principal lateral appendage of the stem. The leaves and stem together form the shoot. Leaves are collectively referred to as foliage, as in autumn foliage. Diagram of a simple leaf. Apex Midvein Secondary vein. Lamina. Leaf margin Petiole Bud Stem Although leaves can be seen in many different shapes, sizes and textures, typically a leaf is a thin, dorsiventrally flattened organ, borne above ground and specialized for photosynthesis. In most lea
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frond Definition of frond. 1  1 : a large leaf (especially of a palm or fern) usually with many divisions. 2  2 : a thallus or thalloid shoot (as of a lichen or seaweed) resembling a leaf.
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- veg·e·ta·tion. n. 1. The process of growth in plants. 2. An abnormal bodily growth or excrescence, especially a clot composed largely of fused blood platelets, fibrin, and sometimes bacteria that is adherent to a diseased heart valve.ecause, so to speak, there are no seasons on the moon's surface, and that, consequently, the phenomena of vegetation of which you speak cannot occur.
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Leaf A leaf is an organ of a vascular plant and is the principal lateral appendage of the stem. The leaves and stem together form the shoot.Foliage is a mass noun that refers to leaves collectively. Typically a leaf is a thin, dorsiventrally flattened organ, borne above ground and specialized for photosynthesis.n ferns and most flowering plants, the mesophyll is divided into two layers: 1  An upper palisade layer of vertically elongated cells, one to two cells thick, directly beneath the adaxial epidermis, with intercellular air spaces between them. 2  Beneath the palisade layer is the spongy layer.
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- foliage definition, meaning, what is foliage: the leaves of a plant or tree, or leaves on the stems or branches on which they are…. Learn more.
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Leaf The leaf shape may also be formed of lobes where the gaps between lobes do not reach to the main vein. An example of this type is the maple leaf. In a compound leaf, the leaf blade is completely divided, forming leaflets, as in the locust tree. Compound leaves are a characteristic of some families of higher plants. Each leaflet is attached to the rachis (middle vein), but may have its own stalk.
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flower petal Noun. 1. flower petal-part of the perianth that is usually brightly colored. petal. floral leaf-a modified leaf that is part of a flower. corolla - (botany) the whorl of petals of a flower that collectively form an inner floral envelope or layer of the perianth; we cultivate the flower for its corolla.
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leafnoun  [ C] leaf noun [ C ] (PLANT) B1 one of the flat, usually green parts of a plant that are joined at one end to the stem or branch: a palm leaf. autumn leaves. He was raking up leaves in his garden. be in leaf/come into leaf. › When a plant is in leaf or when it comes into leaf, it has or gets leaves on it: The trees are in leaf early this year.
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Glossary of botanical terms frond. 1. A leaf of a fern, usually consisting of multiple leaflets. 2. A large, fan-like leaf of a palm tree. 3. A large, leaf-like structure on a seaweed.
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Principles of Biochemistry/Hormones When a peptide hormone binds to a receptor on the surface of the cell, a second messenger appears in the cytoplasm, which triggers signal transduction leading to the cellular responses. Some peptide/protein hormones (angiotensin II, basic fibroblast growth factor-2, parathyroid hormone-related protein) also interact with intracellular receptors located in the cytoplasm or nucleus by an intracrine mechanism.
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- Leaf Tissue Organization The plant body is divided into several organs: roots, stems, and leaves. The leaves are the primary photosynthetic organs of plants, serving as key sites where energy from light is converted into chemical energy.round tissue comprises the bulk of a plant leaf and is generally comprised of a variety of cell types, the predominant of which are parenchyma. Often less specialized than other plant cell types, parenchyma cells are surrounded by thin, flexible primary walls and execute most of the plant s metabolic activities.
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LEAF ARRANGEMENTS LEAF ARRANGEMENTS. The arrangement of leaves describes the positions that leaves grow on a stem. There are 4 different categories of leaf arrangements, and they can apply to either simple or compound leaves. Go to the next page in this tutorial to find out more.
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Crenation Diagram of a crenated leaf. Crenation (from modern Latin crenatus meaning 'scalloped or notched', from popular Latin crena meaning 'notch') in botany and zoology, describes an object's shape, especially a leaf or shell, as being round-toothed or having a scalloped edge.
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- A palm tree is basically a trunk with leaves emerging from that trunk. There can be one or multiple trunks. The leaves or fronds can come off the trunk all the way from the top to the bottom, or just be at the top of the trunk. The leaves are attached to the trunk by a linear stem called the  petiole .Where the petiole attaches to the trunk is called the leaf sheath.. Away from the trunk, the petiole supports leaflets or segments of the leaf.he leaves are attached to the trunk by a linear stem called the  petiole . Where the petiole attaches to the trunk is called the leaf sheath.. Away from the trunk, the petiole supports leaflets or segments of the leaf.
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- The stipula is a scale which forms the future bud, and is situated at the insertions of the leaf. - The thorn, acculeus, is a sharp brittle point, which is so slightly fastened to the plant, as to be taken off without tearing the other parts.
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petal The definition of a petal is the brightly colored outside part of a plant. An example of a petal is one of the red parts on a rose bud. any of the component parts, or leaves, of a corolla. Origin of petal.
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Leaf A leaf is an organ of a vascular plant and is the principal lateral appendage of the stem. The leaves and stem together form the shoot. Foliage is a mass noun that refers to leaves collectively. Typically a leaf is a thin, dorsiventrally flattened organ, borne above ground and specialized for photosynthesis.
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Glossary of Terms and Actions n. 1  The upper angle between a lateral organ, such as a leaf, and the stem that bears it. 2  the angle between the upper side of a leaf or stem and the supporting stem or branch. 3  The angle between the upper side of a leaf or stem and the stem or branch that supports it. A bud is usually found in the axil.
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leaf fall Definition of leaf fall. 1  1 : the natural separation and dropping of the leaf at the end of the growing season and over a short period in deciduous plants or intermittently throughout the year in coniferous trees — compare abscission. 2  2 : fallen leaves on the forest floor.