What are decussate leaves

Definition. Referring to opposite leaves arranged with each succeeding pair at right angles to the pairs below and above them.

What are opposite Decussate leaves?

In opposite phyllotaxy the two leaves at each node are always opposite one another. If the successive pairs of leaves be placed at right angles to one another, the arrangement is termed opposite decussate . In this case, when looked from the top, all the leaves will be found to be arranged along four vertical rows.

What are sessile leaves?

In botany, sessile refers to leaves that are directly attached to the plant’s base. These leaves do not depend on any stalks and are borne directly from the plant’s stem since they do not have a petiole.

What is a Distichous leaf?

distichous. / (ˈdɪstɪkəs) / adjective. (of leaves) arranged in two vertical rows on opposite sides of the stem.

What plants have opposite leaves?

• Ash trees (Fraxinus spp.). The ash tree has a compound leaf, which is also composed of leaflets arranged oppositely.
• Fringe tree (Chionanthus virginicus)
• Maple trees (Acer spp.)
• Olive trees (Olea spp.)
• Viburnums (Viburnum spp.)

What does Obovate leaf mean?

Definitions of obovate leaf. an egg-shaped leaf with the narrower end at the base. type of: simple leaf. a leaf that is not divided into parts.

What is Spiral leaf?

Leaf arrangement The basic arrangements of leaves on a stem are opposite and alternate (also known as spiral). Leaves may also be whorled if several leaves arise, or appear to arise, from the same level (at the same node) on a stem.

What is stipulate leaf?

In botany, a stipule is an outgrowth typically borne on both sides (sometimes on just one side) of the base of a leafstalk (the petiole). … (In some older botanical writing, the term “stipule” was used more generally to refer to any small leaves or leaf-parts, notably prophylls.)

What are lanceolate leaves?

Definitions of lanceolate leaf. a leaf shaped like a lance head; tapering to a point at each end. type of: simple leaf. a leaf that is not divided into parts.

What is meant by Phyllotaxis?

Definition of phyllotaxis 1 : the arrangement of leaves on a stem and in relation to one another. 2 : the study of phyllotaxis and of the laws that govern it.

Article first time published on

What is Phyllotaxy in leaf?

Phyllotaxy is the arrangement of leaves around the stem. … Two leaves are borne at each node on opposite sides of the stem.

What are Cauline leaves?

50-Cauline, sessile leaves. Leaves are said to be cauline when they are attached to an above ground stem, like in this Sullivant’s milkweed Asclepias sullivantii. When the leaf blade is attached directly to the stem, that is, when there is no petiole, like here, the leaf is then called sessile.

Are Succulents sessile?

These are usually herbaceous plants or semishrub with succulent branches and twigs. Leaves, opposite often crowded into a rosette usually sessile.

What is a group of leaves called?

The leaves, stem, flower and fruit together form the shoot system. Leaves are collectively referred to as foliage, as in “autumn foliage”.

What are the four major leaf arrangements?

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.

Do oaks have opposite leaves?

It’s better to get to know all of the distinguishing characteristics of oaks and maples, for example, so that you can recognize them by multiple features, rather than having to check leaf arrangement. … Leaves that grow in pairs from opposite sides of the twig at the same level are called opposite.

What is leaf apex?

The leaf apex is a protruding part of a leaf where water droplets accumulate, and droplet separation occurs during drainage.

Do Monocot stems have petioles?

They may also be the most complex in terms of their venation. Dicot Leaves are connected to the stem by Petioles. Many Monocots do not have petioles but have a distinct Sheath which connects the Blade to the Stem.

What is whorled leaf?

A plant has whorled leaves when there are three or more equally spaced leaves at a node. In angiosperm: General features. … outside) there would be a whorl of five sepals, followed by an alternating whorl of five petals, followed by an alternating set of five stamens.

What is Cuneate leaf?

Noun. 1. cuneate leaf – a wedge-shaped leaf having the acute angle at the base. simple leaf – a leaf that is not divided into parts.

What is Glabrous leaf?

: smooth especially : having a surface without hairs or projections glabrous skin glabrous leaves.

What is Obcordate leaf?

An obcordate leaf. adjective. (botany, of a leaf) Of a reversed cordate shape; heart-shaped but attached to the stalk by the pointed end.

What does a Lanceolate leaf look like?

A lanceolate leaf is usually around four times as long as the broadest point of the leaf. The tip narrows to a definitive and sharp apex, and the base may be pointed as well, or broad and slightly flared, depending on the species. The shape of the leaf, in other words, resembles that of a lance.

What is an elliptic leaf?

Definitions of elliptic leaf. a simple leaf shaped like an ellipse. type of: simple leaf. a leaf that is not divided into parts.

What does Lance shaped mean?

Definitions of lance-shaped. adjective. shaped like a lance. Synonyms: formed. having or given a form or shape.

Is Mango leaf stipulate or Exstipulate?

The Stipules: If stipules are present, the leaves are called stipulate, e.g. rose, China-rose; and if stipules are wanting, they are called ex-stipulate, e.g. mango, guava.

What is meant by Pulvinus leaf base?

A pulvinus (pl. pulvini) is a joint-like thickening at the base of a plant leaf or leaflet that facilitates growth-independent (nyctinastic and thigmonastic) movement. … Pulvini may be present at the base or apex of the petiole or where the leaflets of a compound leaf are inserted into the rachis.

What is Palmately compound leaf?

Palmately compound leaves are the arrangement of leaves in which each leaflet of the blade being separated along a main or secondary vein and the leaflets radiating from the end of the petiole, like fingers of the palm of a hand e.g., Bambax.

What are the three types of phyllotaxy?

• Phyllotaxy is the arrangement or distribution of leaves on the stem or its branches, that will help them to receive maximum sunlight to perform photosynthesis.
• It is of three types alternate, opposite, and whorled.

What is phyllotaxy Class 11?

Phyllotaxy is the pattern of arrangement of leaves on the stem or branch. Phyllotaxy is of three types. Alternate. opposite. In alternate type of phyllotaxy, a single leaf arises at each node in alternate manner.

What do leaf hairs do?

By reflecting quanta that might otherwise be used in photosynthesis, the presence of leaf hairs reduces the rate of photosynthesis. … In other words, under aird conditions and/or high air temperatures, leaves of E. farinosa would have a higher rate of photosynthesis by being pubescent than by not being pubescent.