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The midrib extends from the petiole to the leaf tip and contains the main vein. Additional veins branch from the midvein. The margin is the edge of the leaf. Figure 3.4.1.2 3.4.1. 2: The petiolate leaves of the geranium consist of a petiole and blade (lamina). The wide lamina is attached to the stalk-like petiole.
- 30.4: Leaves - Biology LibreTexts
Structure of a Typical Leaf. Each leaf typically has a leaf...
- 30.8: Leaves - Leaf Structure and Arrangment - Biology LibreTexts
The arrangement of leaves on a stem is known as phyllotaxy;...
- 30.4: Leaves - Biology LibreTexts
Chart illustrating leaf morphology terms. The following terms are used to describe leaf morphology in the description and taxonomy of plants. Leaves may be simple (a single leaf blade or lamina) or compound (with several leaflets). The edge of the leaf may be regular or irregular, may be smooth or bearing hair, bristles or spines.
ImageTermLatinacicularaciculariswhole leafacuminateacuminatusleaf tipacuteleaf tip or basePointed, having a short sharp apex angled ...apiculateapiculatusleaf tip- Leaves
- Parts of Leaves
- Macroscopic Characters of Leaves
Leaves are flat, thin green appendages to the stem, containing supporting and conducting strands in their structure. They develop in such a way that older leaves are placed at the base while the younger ones at the apex. 1. Atypical angiospermic leaf consists of the following parts:
(a)Leaf base or hypopodium by means of which it is attached to the stem. (b) Petiole:It is the stalk of leaf with which leaf-blade is attached to the stem. It is also known as mesopodium. It may be present in leaf or may be absent in leaf. Leaves with petiole are called petiolate while those without petiole, are called sessile. They may be short or...
(a) Shape of the lamina of leaves:
Various shapes of the leaves are due to various types or shapes of lamina. It may be one of the following: 1. Acicular: Needlelike ie. Pinus. 2. Subulate: With acute apex and recurved point i.e. Ephedra sinica. 3. Linear: When it is long narrow and flat i.e. Grasses. 4. Oblong: Broad leaves with two parallel margins and abruptly tapering apex i.e. Banana. 5. Lanceolate: Which look like lance or spear-shaped. Examples Nerium, senna. 6. Ovate: Egg-shaped or broad base and narrow apex. Examples...
(b) Leaf margins:
Leaf margin may be of the following types: (a) Entire:When it is even and smooth i.e. senna, eucalyptus. (b) Sinuate or wavy:With slight undulations like Ashok. (c) Crenate:When the teeth are round as in digitalis. (d) Dentate:Toothed margin, teeth directing outwards such as Margosa, Melon. (e) Serrate:When it is like the teeth of the saw such as Rose, China rose etc. (f) Ciliated:It is fringed with hairs. (g) Spiny:When provided with spines like Argemone. (h) Bi-serrate:Lobed serrate margin....
(d) Leaf Bases:
The lower extremity of the lamina of the leaf may exhibit one of the following shapes: 1. Symmetrical: Equal as in vasaka. 2. Asymmetrical: Unequal as in senna or Datura. 3. Decurrent: As in Digitalis. 4. Cordate: As in Betel.
Dec 21, 2018 · Most leaves have two main parts: (1) the blade and (2) the petiole, or leafstalk. The leaves of some kinds of plants also have a third part, called the stipules. The Blade, or lamina, is the broad, flat part of the leaf. Photosynthesis occurs in the blade, which has many green food-making cells. Leaf blades differ from one another in several ...
Structure of a Typical Leaf. 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.
Oct 31, 2023 · The arrangement of leaves on a stem is known as phyllotaxy; leaves can be classified as either alternate, spiral, opposite, or whorled. Plants with alternate and spiral leaf arrangements have only one leaf per node. In an opposite leaf arrangement, two leaves connect at a node. In a whorled arrangement, three or more leaves connect at a node.
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4 days ago · When only a single blade is inserted directly on the petiole, the leaf is called simple. The margins of simple leaves may be entire and smooth or they may be lobed in various ways. The coarse teeth of dentate margins project at right angles, while those of serrate margins point toward the leaf apex.
