Classified in terms of appearance, what are the types of leaves?

The leaf shapes of plants are oval, heart-shaped, palm-shaped, fan-shaped, lanceolate. The oval blades are 6 20 cm long and 5 10 cm wide, with fine wavy shapes at the edges, wide and flattened in the middle, rounded at the apex and bottom. Lanceolate blades, 18 32 cm in length and 6 8 cm in width, broad at the base and pointed at the top.

1. Oval.

The leaves are oval, the middle part is wide and flattened, and the apex and bottom are rounded. Such as camphor trees, rubber trees.

The leaves of wood rhinoceros, tea tree, black date tree, and primrose are generally 6 20 cm in length and 5 10 cm in width, and the edges of the leaves will have a fine wavy shape.

2. Heart-shaped. <>

The heart-shaped blades are broadly rounded at the base and have a concave shape, with a tapering apex that is gradually sharpened. Such as sweet potato, morning glory, bauhinia, hemp leaves, sorrel.

The leaflets, generally 5 15 cm in length and 2 3 cm in width, will be covered with white hairs on the surface of the leaf.

3. Palm shape. <>

The palm-shaped blades, shaped like the palm of a hand, have many deep fissures and are oval at the base. Such as cotton, castor.

Grapes, maples.

The leaves of the sycamore, generally 15 30 cm in length and 10 15 cm in width, will have irregular jagged shapes on the edges of the leaves.

4. Scalloped. <>

Scalloped blades, shaped like umbrellas, with distinct notches in the middle of the blades and a broad oval at the base. Such as ginkgo leaves, four-leaf clover.

The leaves of the shy grass, generally 5 20 cm in length and 2 5 cm in width, have a smooth surface and change in color from green to yellow.

The morphology of leaves is mainly divided into two types: single leaves and compound leaves. Only one leaf grows on a single petiole and 2 or more leaves grow on a compound petiole. The blade edge of a single leaf is intact and is called a whole marginal leaf, and the edge of a compound leaf is undulating, called a notch.

Single leaves have axillary buds at the axils of the leaves, supporting leaves at the base of the petioles, and young shoots at the tips of the small branches, but no compound leaves.

The morphology of leaves is mainly divided into single leaves and compound leaves, single leaves are only one leaf on the petiole, and the main shape is needle-shaped leaves, such as pine and spruce; ovate leaves, most typically sunflower; Scalloped leaves, commonly known as ginkgo biloba.

Wait. Compound leaves, on the other hand, refer to two or more leaves on a petiole, typically palmate compound leaves, such as horse chestnut trees.

Lucky Tree, etc. <>

Only one leaf grows on the petiole of a single leaf, while the petiole of a compound leaf has two or more leaves. From the root point of view, compound leaves are differentiated from a single leaf, and when the depth of the leaf lobes reaches the leaf base or main vein, and a small petiole is born, it is differentiated into compound leaves, at this time the petiole is called the total petiole, and the leaf on the petiole is called leaflet.

The edge of the single leaf is complete, called the whole marginal leaf, and the edge of the compound leaf is undulating, called the notch, which is divided into sawtooth, deep lobe, shallow lobe, or total lobe according to the depth of the notch. There are many types of single leaves, including round-ovate, inverted-lanceolate, arrow-shaped, wedge-shaped, oblong-elliptic, etc., and the compound leaves are roughly divided into pinnate compound leaves, palmate compound leaves, three-out compound leaves, single compound leaves, etc.

Single leaves have axillary buds at the axillary position of the leaves, pedicles at the base of the petioles, and young shoots at the tips of the small branches, but no compound leaves. The leaf inflorescence of a single leaf is arranged on the stem, the leaflets of the compound leaves are all on the same horizontal plane, and the leaf inflorescence is distributed outward on the stem with the total petiole at the concentration point, and the petiole of the single leaf falls together with the leaf when the leaf falls, and the compound leaf falls off first, and the petiole falls off later.

1 The holomorphic shape of the leaves: (1) needle-shaped Elongated and apex like a needle, with a triangular or diamond-shaped cross-section, such as the leaves of pine and spruce. (2) Bars (lines) are long and narrow, often more than five times as wide, and slightly equal in length, with nearly parallel edges on both sides.

3) Lanceolate often about 4 to 5 times as wide, with the middle or below the middle being the widest, upward.

1. Scaly, scaly leaves are as small as scales, and they are born close to the twigs, which are called scales. The main species are cypresses.

2. Bar-shaped, the strip-shaped leaf is also called linear, the leaf is narrow and long, the length is more than 5 times the width, and the full length and width are nearly equal, and the leaf margins on both sides are nearly parallel. The main varieties are metasequoia, wheat winter, fir and so on.

3. Thorn-shaped, thorn-shaped leaves are strip-shaped, but the apex is tapering and has a thorny tip. The main varieties are juniper, paving cypress and so on.

4. Conical, cone-shaped leaves are long and slender, gradually thin and sharp from the base to the top. The main species is cedar.

5. Lanceolate, the lanceolate leaf is 4 5 times as long as it is wide, the middle or below the middle is the widest, and the ends are gradually narrowed, which is called lanceolate. The main varieties are weeping willows, peaches, etc. If the widest point is above the middle, it is called inverted-lanceolate.

6. Oblong, oblong leaves oblong also known as rectangular round, the length of the leaf is about 3 4 times that of width, the edges on both sides are slightly parallel, and the main varieties have bones.

Anyone can see the phenomenon, I really haven't heard anyone mention it, it's interesting, you're a bit like Newton. That's the formation of plant evolution, a certain shape of the leaf can adapt to the plant to survive in a specific environment, and slowly evolved into the current shape, because of the heritability of the gene, so it has been retained, what kind of plant is what kind of leaf.

The basic shape of the leaf.

The tip of the leaf is called the tip of the leaf, and there are different types of tip of the leaf: including.

Pointed, tendril-shaped, caudal pointed, concave, tapering, obtuse.

The base of the leaf is the leaf base, and the leaf base has different forms:

Heart-shaped, earlobe-shaped, arrow-shaped, halberd-shaped, shield-shaped, rounded, truncated leaves are margined by leaf margins, which are of the type of entire, serrate, and toothy.