What are the common leaves?
1, Ginkgo biloba leaves
2. maple leaf?
3. Elm leaves
4. Flat hazel leaves?
5. Li Dou left
6. Huang Wei
7. lilacs
8. Populus simonii
9. Dayepu?
10, Oshima Sakura
1 1, Populus tomentosa
12, hawthorn leaves
13, Parthenocissus tricuspidata
14, pearl plum?
15, leaves of the golden bell flower
16, Yushu
17, begonia pendula
18, Euonymus japonicus
19, Berberis rubra
20, forsythia suspensa
Composition of leaves
A complete leaf includes the following three parts:
Leaves-mostly wide and flat, suitable for receiving sunlight.
Petiole-supports the leaf and connects it to the stem.
Stipules-protect young leaves. (Some plants have no stipules, and some plants have long lost stipules. )
leaf vein
Veins are veins with different thicknesses covering the leaves. There are two kinds of veins:
Reticular veins-the veins of leaves are interlaced with each other to form a network. Most dicotyledonous plants have reticular veins on their leaves.
Parallel veins-the veins are not staggered and generally distributed in parallel. Most monocotyledonous plants have parallel veins.
Species of leaves
According to the number of leaves on the petiole, leaves can be divided into two types:
Single leaf-only one leaf grows on each petiole.
Compound leaves-there are many leaflets on each petiole.
Leaf morphology
Oval shape: it is oval in shape, widest in the middle and round at the top and base, such as the leaves of camphor tree, rubber tree, osmanthus, tea tree, black date and primrose.
Heart-shaped: it looks like a heart, with a wide round base and a slightly concave top, such as sweet potato, morning glory and bauhinia. Cannabis leaf. If the heart is inverted, it is called inverted heart, such as the leaflets of Oxalis.
Palm shape: the leaves are divided into three or five parts, forming a deep notch, like the palm, such as the leaves of cotton, castor, grape, maple and phoenix tree.
Fan-shaped: shaped like an unfolded folding fan, with a wide and round top and tapering towards the bottom, such as Ginkgo biloba leaves.
Diamond: A Syrian square with equilateral leaves, such as diamond leaves and tallow leaves.
Needle-shaped: Also known as spear-shaped, the leaf base is wide, the apex is gradually pointed, and the length is about 3-4 times of the width, such as the leaves of peach, willow and bamboo. If it is inverted, it is called inverted needle, such as tillering leaves.
Oval shape: shaped like an egg, with a wide bottom and a narrow top, such as the leaves of mulberry, sunflower and sunflower. If the egg is upside down, it is called upside down, such as the leaflets of magnolia and peanut.
Round: shaped like a disk, almost equal in length and width, such as the leaves of the trollius chinensis.
Needle-like: leaves are slender as needles, such as Pinus tabulaeformis, Pinus massoniana and Pinus bungeana.
Scales: Scaly, as the leaves of Platycladus orientalis.
Spoon-shaped: spoon-shaped, with a rounded top and tapering towards the bottom, as in cabbage and plantain leaves.
Triangle: the base is wide and flat, and the three sides are close, such as buckwheat leaves.
The role of leaves
Leaves are the main organs of plants for photosynthesis and nutrient production. Release oxygen for human beings, provide food, shelter from wind and shade.
Leaves turn red: Because anthocyanins increase, acidic leaves turn red. There are also "maple leaves, cypress leaves and persimmon leaves" and so on.
Leaves turn yellow: chlorophyll is destroyed, leaving only lutein. Common ones are "laurel leaves, ginkgo leaves, poplar leaves and phoenix leaves".