Types of Leaf Arrangements
- Alternate Leaf Arrangement. In an alternate leaf arrangement, there is one leaf per plant node, and they alternate sides. ...
- Opposite Leaf Arrangement. On these trees and shrubs with opposite arrangement, two leaves arise from the same node on opposite sides of the stem.
- Whorled Leaf Arrangement. ...
What are the examples of opposite leaves?
- Katsura, Genus Cercidophyllum (p. ...
- Eucalyptus, Genus Eucalyptus (p 109) – three introduced species have juvenile foliage opposite, but adult foliage alternate [Crape-myrtle, in the same family, has alternate leaves]
- Paper Mulberry, Genus Brousonettia (p. ...
- Lyontree, Genus Lyonothamnus (p. ...
- Beebee Tree, Genus Evodia (p. ...
- Corktree, Genus Phellodendron (p. ...
What are the different types of leaf arrangement?
- Leaves are found at the nodes of the stem and contain the photosynthetic pigment chlorophyll.
- There are three main parts of a leaf – Leaf base, leaf lamina, and petiole.
- There are two different types of leaves – simples leaves and compound leaves. ...
What are some examples of alternate leaves?
Some of the most common shapes of leaves include the following:
- Ovate leaves are egg-shaped with the widest point being nearer the stalk
- Obovate describes a tear-shaped leaf where the tapered end is at the stalk
- Lanceolate is a leaf shape that looks like the tip of a lance
- Acute leaf shapes are elongated and slightly oval and have a pointed tip
Does a basil leaf have whorled or opposite arrangement?
With an opposite leaf arrangement, two leaves arise from the stem at the same level (at the same node), on opposite sides of the stem. An opposite leaf pair can be thought of as a whorl of two leaves. With an alternate (spiral) pattern, each leaf arises at a different point (node) on the stem.
What are the leaf arrangements?
Leaf Arrangement Leaves are classified as either alternate, spiral, opposite, or whorled. Plants that have only one leaf per node have leaves that are said to be either alternate or spiral. Alternate leaves alternate on each side of the stem in a flat plane, and spiral leaves are arranged in a spiral along the stem.
What are the 3 types of leaf arrangements?
Alternate leaves, whorled leaves and opposite leaves are the three different types of leaf arrangements displayed by woody plants.
What is opposite and superimposed arrangements?
Opposite superposed is a type of phyllotaxy in which successive pairs of leaves are present just above each other, in such a way that all leaves appears to be present in one plane, overlapping one another.
Which plant has opposite arrangement?
angiosperms. In opposite-leaved plants, the leaves are paired at a node and borne opposite to each other. A plant has whorled leaves when there are three or more equally spaced leaves at a node.
What is alternate and opposite phyllotaxy?
Phyllotaxy is the arrangement of leaves on the stem in plants. It is of 3 types, namely alternate, opposite and whorled. In alternate type, leaf arises at each node in an alternate manner. Examples include china rose, sunflower, grass. In opposite type, pair of leaves arise at each node and are opposite to each other.
What are opposite superposed and Decussate leaves?
Opposite superposed phyllotaxy In opposite decussate phyllotaxy, the pair of leaves at one node lie at right angles to the pair of leaves at the next node. Eg: Calotropis. In alternate phyllotaxy, a single leaf arises at each node in an alternate manner.
What is opposite Decussate leaf?
In opposite decussate phyllotaxy, a pair of leaves at one node lie at right angle to the next pair of leaves at the next node. It is seen in Calotropis. So, the correct option is 'Calotropis'.
What is opposite phyllotaxy?
Thus, the correct answer is 'Calotropis. '
What is leaf arrangement?
Leaf arrangement is a key characteristic on which plant taxa are classified. Monocots, dicots and gymnosperms have different types of arrangements. This guide is an easy-to-understand explanation of the different types of leaf arrangements and how those affect plant taxonomy.
What is the arrangement of leaves in a stem called?
We all know that the arrangement of leaves in a stem is called phyllotaxy, but most people have no idea what this means. Most basic flowering plants have three basic types of arrangements which include alternate, opposite and whorled when it comes to leaf arrangements, but there are also other leaf arrangement types you should know about, but these are the basic ones.
What is the difference between monocots and dicots?
Monocots have parallel venation in which veins run in straight lines across the length of the leaf without converging. While the veins in dicots have a net-like appearance, forming a pattern called reti culate venation. One example of a plant with dichotomous venation is the ginkgo biloba tree.
What is the lower side of a leaf called?
The lower side is called adaxial , and the upper side is called abaxial. The adaxial surface of a leaf is the surface closest to the axis, and the abaxial surface of a leaf is furthest from it. This arrangement can also be seen in species such as Agave sisalana, where all leaves grow around the stem in vertical rows.
What plants have whorled leaves?
Examples of plants with whorled leaves include mountain laurel, Japanese clethra, blackboard trees, redvein enkianthus, panicle hydrangea, and lemonwood. Some can have both opposite and whorled leaves throughout the plant.
How many leaves are in an alternate leaf arrangement?
In alternate leaf arrangement, there is one leaf per plant node. Examples of trees and plants with this leaf arrangement include blackberry, black walnut, sweetgum, smoke bush, ninebark, and Japanese zelkova. Note that plants with alternate and spiral leaf arrangements have only one leaf per node.
What is the leaf blade called?
Each leaf has a leaf blade called the lamina, which is also the widest part of the leaf. Some leaves are attached to the stem by petiole, while others do not have petiole and are directly attached to the plant are called the sessile leaves. Leaves also have stipules, which are small green appendages found at the base of the petiole.
What are the three types of leaf arrangements?
There are three basic types of leaf arrangements found in trees and shrubs: alternate, opposite, and whorled. In an alternate leaf arrangement, there is one leaf per plant node, and they alternate sides. Black walnut ( Juglans nigra ).
How many leaves are in an alternate leaf arrangement?
In an alternate leaf arrangement, there is one leaf per plant node, and they alternate sides.
What is a rosette plant?
Rosettes often referred to as basal rosettes, occur in acaulescent plants, such as the common dandelion (Taraxacum officinalis) in the sunflower/aster family (Asteraceae). Acaulescent plants do have a stem, but the internodes are greatly contracted, and the leaves have an alternate spiral arrangement.
What is the opposite leaf of a barberry?
Barberry ( Berberis thunbergii) Black walnut ( Juglans nigra ). The black walnut may appear to have an opposite leaf arrangement, but it has compound leaves. The opposite leaflets form the entire true leaf, which alternates on the stem. Japanese zelkova ( Zelkova serrata)
How are leaves arranged?
Leaves are arranged in two vertical rows on opposite sides of the stem alternating every 180 degrees. Distichous leaf or botanical element (flowers, seeds) arrangements are a form of alternate leaf arrangement.
What is a sub-opposite arrangement?
Olive trees ( Olea spp.) Viburnums ( Viburnum spp.) A sub-opposite arrangement is a condition in which the leaves are not spaced far enough apart to be considered alternate nor are they perfectly opposite one another. 02 of 05.
Where do the leaves come from in a perennial plant?
All the leaves arise from the base (crown) of the plant. Many perennial plants are trimmed back to new basal foliage once the older foliage starts to look tired and worn. Examples of perennials that send up new basal growth later in the growing season are Geranium, Polemonium, and Pulmonaria. 04 of 05.
Structure of a Typical Leaf
Each leaf has a leaf blade called the lamina, which is also the widest part of the leaf. Some leaves are attached to the stem by petiole, while others do not have petiole and are directly attached to the plant are called the sessile leaves. Leaves also have stipules, which are small green appendages found at the base of the petiole.
Opposite Leaf Arrangement
The opposite leaf arrangement is when a plant has two leaves growing out of the same node. The two leaves are on either side of each other, and there is no space in between the leaves.
Whorled Leaf Arrangement
A whorled or verticillate arrangement is a plant with three or more leaves growing out of each node. In this pattern, there are several leaves coming from one spot on the plant stem. In some cases, it may look like a circle of leaves growing from a single spot on the stem.
Rosette Leaf Arrangement
Rosettes are often referred to as basal rosettes because they are found at the base of the plant, around the stem. The basal leaf arrangement occurs when one central leaf emerges from the ground to form a circular shape. Examples of rosettes occur in acaulescent plants, such as common dandelions in the sunflower or aster family.
Perfoliate Leaf Arrangement
In this arrangement, the stem is completely wrapped or buried around its support. Leaves of this type are arranged in a circle with their bases adhering to the petiole and the blade expanding away from the plant center. A good example of perfoliate leaf arrangement is found in Trillium grandiflorum, commonly known as white wake-robin.
Distichous Leaf Arrangement
In this type, the leaves are arranged in two opposite rows on either side of a stem. In other words, they grow along two opposite sides of the shoot axis at right angles to each other. Distichous leaf arrangement is common in monocotyledons, especially grasses and sedges groups.
Basal Leaf Arrangement
All the leaves arise from the base of the plant. Perennial plants are trimmed back to new basal foliage once in a while, which leads them to grow new leaves that can be located at the base. Perennials with basal leaf arrangement include harebell, whorled stonecrop, yarrow, and oxeye daisy.
