Problems with single leaved compound leaf inflorescences

Your question is very good, botany major.

Books generally don't tell you the difference between single and compound leaves.

Here's how to help you solve the problem.

The petiole of a single leaf is borne on the node of the stem, and there are often buds in the axils of the leaf; The petiole of the leaflet (which is actually just the vein) grows on the veins of the larger compound leaves, rather than on the nodes of the stem.

You only need to distinguish the position of the petiole of a leaf according to the above characteristics.

Supplement: Leaflets are just one component of compound leaves.

If you can think of a compound leaf as a leaf, then the petiole of the leaflet can easily be seen as a vein in the compound leaf. Many leaflets in the compound leaf are part of the compound leaflet, and they are basically distributed in a plane, so there is no leaf sequence between the leaflets.

A compound leaf can be seen as a large palm-shaped leaf, and the petiole is the thicker vein.

Leaf inflorescence refers to the order in which leaves grow, there are leaf inflorescences between single leaves, and there are also leaf inflorescences between compound leaves and compound leaves, but there is no leaf inflorescence between the leaflets in compound leaves.

There are alternate and opposite leaf sequences between compound leaves and compound leaves; There is no leaf sequence relationship between the leaflets in the compound leaves, and there are only several descriptions such as a few times and several exits.

Your opinion of the leaves of plants is not wrong, and the description of the encyclopedia is not wrong, the problem lies in the disagreement. Therefore, in scientific research, people attach great importance to "plant specimens", and the role of [specimens] is to avoid the defects of language description, and it is not unreasonable to compare "reading 10,000 books" with "traveling thousands of miles".

1. According to the number of leaves on the petiole, the leaves can be divided into single leaves and compound leaves.

2. If there is only one leaf on a petiole, it is called a single leaf. For example, the leaves of poplars and willows.

3. If there are more than two leaves on a petiole, it is called compound leaves. The leaves that make up the compound leaves are called leaflets, and the petioles of one compound leaf are called the total petioles. The morphology of compound leaves is different, and it can be divided into the following according to the different states of the leaflet arrangement:

The leaflets of the palmate compound leaves are all born at the tip of the total petiole and are arranged like palms, like the compound leaves of horse chestnut trees. The leaflets of the pinnate compound leaves are feather-like and arranged on both sides of the total petioles, like the compound leaves of the moon. The three leaflets of the triple compound leaves are all born at the tip of the total petioles, such as the compound leaves of a clover.

4. This change in leaves is an adaptation of plants to a bad environment during long-term evolution. Because a compound leaf composed of many cotyledons is much less affected by wind, rain, and snow than a single leaf of equal size.

Single leaf: The leaf is a single leaf called a single leaf. If a single leaf has a petiole, there is only one leaf on the petiole, and the other end of the petiole in front of the oak bush is on the branch, and there is no joint between the petiole and the Zhengfan leaf.

It is one of the most prevalent leaf types in plants. There are many shapes, such as needle-shaped, bar-shaped, lanceolate, and obovate. Such as poplar, willow, peach, bamboo, sweet potato, mulberry, cotton, rape, castor leaves.

Compound leaves: It is composed of many leaflets, such as compared with a single leaf of the same size, although the total area of the leaf is reduced, but the pressure or resistance imposed on the leaf by wind, rain and water is much less, which is an adaptation to the environment. According to the different arrangement and number of leaflets on the leaf axis, they can be divided into palmate compound leaves, three-out compound leaves, and pinnate compound leaves.

"Shaped" refers to the shape, and the compound leaves are generally pinnate or palmate. "Return" is unique to compound leaves, if you don't say "a few times", it is a return leaf by default, and generally the compound leaves will reach the top three times. The palm-shaped compound leaves are generally one, and the second and third rounds are basically pinnate compound leaves.

How to judge how many times the Yu faction is is also very simple, first of all, we must understandSingle-leafedIt is the smallest unit of compound leaves, several piecesSingle-leafedBorn on a petiole cultivation row is".A pinnate compound leaf(An odd number of single leaves is an odd pinnate compound leaf, and an even number of single leaves is an even pinnate compound leaf), a number of stripesA pinnate compound leafThe pair is born on the second petiole, which is".The second pinnate compound leavesThree pinnate compound leavesAnd so on.

These botanical knowledge is very basic for landscape architecture majors, so it is not difficult to calm down a little and spend some time on learning when you go to university. How interesting botany is.

Compound. <> leaf shape.