The leaves on the escape are not at all chaotic. Their attachment to the axis of the aerial part of the plant occurs only in certain places, which are called nodes, has its own regularities. In this article we will consider what is the opposite list.
The leaf arrangement, or phyllotaxis, is calleda certain order of attaching the leaves to the stem. This feature is an important systematic feature. There are three main types: regular (spiral), whorled (ringed) and opposite sheet.
In the first case, only one sheet leaves the node. Relatively to each other they are arranged in a spiral. Examples of such plants are pear, dog rose, wheat and peach. In a whorled type, more than two leaves leave the node. Such a leaf arrangement can be observed in pine, crow's eye, cypress, elodea.
The opposite type is characterized by the presence of twoleaves in the node. At the same time they are located opposite each other. As a result, a kind of mosaic is created, which allows maximum use of sunlight. The opposite leaf list is considered a special case of whorled. Two plates are located in one node in such a way that their medians are in a single vertical plane.
Naturally, the order of the arrangement of leaves onThe stem is not the only feature that determines the systematic position of the plant. But it is always used when describing species. Thus, the opposite leaf list is characteristic for the representatives of the families of the honeysuckle, gubotaceous and clove.
The first of them are viburnum, elderberry,honeysuckle, musk grass, trehkostochnik, snow leopard, linenea, diervilla. The composition of the family Gubotsvetnye, or Nastotkatkovye includes mint, basil, sage, melissa, thyme, oregano, savory. Most of them are herbaceous plants. The name Gubotsvetnye this family received because of the appearance of the flowers. They look like an open mouth.
Herbaceous is the majorityrepresentatives of the Clove family. They are used as fodder and ornamental crops, and some have found application in medicine. It is a tar, a soap, a dawn, a tonic, and a doze.
So, with the opposite list of locations in the nodes opposite each other, there are two plates. This feature of the structure is characteristic of clove, honeysuckle and acacia plants.
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