What is a pinnate leaf?
A leaf which is divided into smaller leaflets, those leaflets arranged on each side of the leaf’s central stalk/rachis (axis). A bipinnately compound leaf is twice pinnate; a leaf blade divided into leaflets and having twice-diverged branching. …
What is an example of a pinnate leaf?
An example of this type is the maple leaf. Pinnately compound leaves take their name from their feather-like appearance; the leaflets are arranged along the middle vein, as in rose leaves or the leaves of hickory, pecan, ash, or walnut trees. In a pinnately compound leaf, the middle vein is called the midrib.
What is the shape of a pinnate leaf?
resembling a feather, as in construction or arrangement; having parts arranged on each side of a common axis: a pinnate branch. 2. (of a leaf) having leaflets or primary divisions arranged on each side of a common stalk. pin′nate•ly, adv.
What are whorled leaves?
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 a rachis botany?
1 : an axial structure: such as. a(1) : the elongated axis of an inflorescence. (2) : an extension of the petiole of a compound leaf that bears the leaflets.
What does pinnate mean?
: resembling a feather especially in having similar parts arranged on opposite sides of an axis like the barbs on the rachis of a feather a pinnate leaf — see leaf illustration.
What are the 4 types of 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. 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 trees have whorled leaves?
Examples of trees and shrubs with a whorled leaf arrangement:
- Blackboard tree (Alstonia scholaris)
- Japanese clethra (Clethra barbinervis)
- Lemonwood (Pittosporum eugenioides)
- Mountain laurel (Kalmia latifolia)
- Panicle hydrangea (Hydrangea paniculata)
- Redvein enkianthus (Enkianthus campanulatus)
How do you identify a Palmately compound leaf?
In palmately compound leaves, the leaflets form and radiate from a single point of attachment called the distal end of the petiole or rachis. Another way to describe the palmate form is that the whole leaf structure is “palm-like” and shaped like the palm and fingers of your hand.
Is Ivy simple or compound?
Poison ivy leaves are compound rather than simple – a single leaf is divided into three separate portions, called leaflets.
What is whorled type of arrangement?
In botany, a whorl or verticil is an arrangement of leaves, sepals, petals, stamens, or carpels that radiate from a single point and surround or wrap around the stem or stalk. A leaf whorl consists of at least three elements; a pair of opposite leaves is not called a whorl.
Where are the leaflets on a pinnate leaf?
These leaflets form on either side of an extension of the petiole called the midrib in a simple leaf or a rachis in multi-pinnate leaves. Interestingly, some pinnately compound leaves can branch again and will develop a second set of pinnately compound leaflets.
What are the leaves of a pinnate compound?
These pinnately compound leaves can compound again, branching off secondary rachises and forming new leaflets called pinna. That subsection of pinnate leaf arrangement belongs to a separate category called bipinnately and tripinnately compound leaves.
What kind of leaves are on a double pinnate tree?
Double pinnate (bipinnate) leaves Trees with bipinnate leaves have leaves that resemble fern leaves. You will notice in pictures of double pinnate leaves that the compound leaves are made up of a number of secondary stems that have leaflets growing in an opposite arrangement.
Which is an example of a plant with bipinnate leaves?
The pinnules on one secondary vein are called “pinna”. The silk tree ( Albizia) is an example of a plant with bipinnate leaves. Leaves have many structures that prevent water loss, transport compounds, aid in gas exchange, and protect the plant as a whole.