Lobules inrachisOn both sides of theFeatherThe shape is called pinnate.More than 3 leaflets are arranged on the left and right sides of the leaf axis in feather shape, such asBroad bean、chinese roseLeaves of etc.The pinnate compound leaves can be divided into one, two, three or more due to the branching of leaf axisbipinnate leaf 。
The pinnate compound leaf is a kind of compound leaf.Leaflets A compound leaf arranged in feather shape on a petiole.If there is one leaflet at the top, it is called odd compound leaf, such as walnut, locust tree, etc. If there are two leaflets at the top, it is calledEven pinnate compound leaf, such as saplings, acacia, etc.If the general handle is bifurcated, it can form double pinnate compound leaves (such as Albizia leucocephala) or triple pinnate compound leaves (such as Melia azedarach).[1]
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Pinnate compound leaf
Feathered compound leaves. If only one leaflet grows at the top of the leaf axis, it is called odd or odd pinnate compound leaves, such as locust tree;When there are two leaflets on the top of the leaf axis, they are called even pinnate compound leaves or double pinnate compound leaves, such asSaphenous。In pinnate compound leaves, ifrachisWhen there is a row of leaflets on both sides, it is called a pinnate compound leaf, such aspagoda tree；If there are pinnately arranged branches on both sides of the leaf axis, only pinnately arranged leaflets grow on both sides of the branch, this is calledbipinnately compound leaf , such asAlbizia julibrissin；By analogy, there can be three or more pinnate compound leaves.According to the above situation, to be more precise, we can call the leaf of locust tree "Yihui"Odd pinnate compound leaf，Innocuous cotyledonIt is called primary even pinnate compound leaf and secondary even pinnate compound leaf.In the pinnate compound leaves, if the leaflets are different in size, uneven, or alternate in size, they are called uneven pinnate compound leaves, such as tomatoesDragonbudEtc.[1]
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Pinnate compound leaf
The shape characteristics of pinnate compound leaves are mainly the leaves with several leaflets on the common petiole or leaf axis.Each leaflet has a significantly separated base, and sometimes has its own petiole.Compound leaves are composed of most leaflets. For example, compared with single leaves of the same size, although the total area of the leaves has decreased, the pressure or resistance imposed on the leaves by wind, rain and water is much less, which is an adaptation to the environment.According to lobules inrachisThe difference between the above arrangement and number can be divided intoPalmate compound leafThree out compound leaves and pinnate compound leaves.Several leaflets gather at the end of a common petiole and are arranged into palmate, which is called palmate compound leaves, such asAesculus chinensis。Three leaflets are gathered at the end of a common petiole, calledTrifoliate compound leaf, such as alfalfa.The leaflets are arranged on both sides of the leaf axis formed by the extension of the petiole, which are feathery, and are called pinnate compound leaves.If the total number of leaflets is even, it is called even pinnate compound leaf, such as flowering;If the total number of leaflets is singular, it is called odd pinnate compound leaf, such as rose;The leaf axis no longer branched is a pinnate compound leaf, such as rose;The branch with only one time is secondaryPinnateCompound leaves, such as acacia;The secondary branches are triple pinnate compound leaves, such as southern day bamboo.[1]
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simple pinnate leaf
Pinnate compound leaf
Single pinnate compound leaf: evolved from the single leaf of pinnate vein, i.e. formed at one time through common cleft) and according to the odd or even number of leaflets and the number of leaflets, there are:
(1) One even number of pinnate compound leaves: that is, one even number of leaflets of one pinnate compound leaves, that is, one pinnate compound leaf with two top leaflets (such as Cassia obtusifolia).
(2) An odd number of pinnate compound leaves: that is, the leaflets of an odd number of pinnate compound leaves, that is, the pinnate compound leaves (such as roses) with one top leaflet.
Double pinnate compound leaf: also evolved from the single leaf with pinnate leaf chant, namely, it was formed twice through general cracks, and also has odd and odd points.
(1) Double even pinnate compound leaves: that is, the leaflets are even, that is, the top leaflets are two double pinnate compound leaves (such as acacia).
(2) Double odd pinnate compound leaves: double pinnate compound leaves (such as Salvia miltiorrhiza) with odd leaflets and one top leaflet.[1]
tripinnate leaf
It is also evolved from a single leaf with pinnate compound leaves, that is, it is formed three times through general cracks (such asThalictrum）。
pinnately decompound leaf
It is also composed ofsimple leafIt is evolved, that is, it is formed by common multiple fractures (such asfennel）。
