Group angiosperm flora are divided into monocots and dicots that differ mainly the structure of the embryo.However, these plants have classes and other differences in the structure of vegetative and generative organs.
Class bipartite or Magnoliopsidy: the structure of plants and their brief characteristic
Today this class is considered to be quite large, so it includes about 200 thousand species.Its representatives have a number of very specific distinctive features.
dicots presented different forms - that trees and shrubs, and grasses.In woody species within the stem has a fairly thick layer of cambium - a special fabric that ensures its growth in width.Plant leaves can be both simple and complex, but in almost all species, they Cherenkov - sessile leaf blades are not typical for this class.Venation lamina reticularis in most cases.The root system is mainly rod - is the main, the main root from which grow side, small size.
Another feature - a structure of generative organs.In most species have large flowers with bright colors.They have a double perianth (sepals and petals) flowers mostly five- or four-membered.Dicots most often pollinated by insects.
And, of course, very characteristic is the structure of the embryo, which has two side cotyledons.By the way, with this feature, and the name of the associated class.
dicots: the most common types of
This class includes a great number of species that are included in the delivery of several thousand and three hundred families.The most famous of them are the following.
cruciferous - its representatives are distributed mainly in the northern hemisphere of the planet.Most of its species - a grassy shape or small shrubs.Everyone is familiar with such representatives cruciferous like cabbage, radish, horseradish, turnips, mustard and radish.
Family Pink combines trees, shrubs and herbaceous plants, which are mainly distributed in temperate and subtropical climates.For example, the famous wild rose and decorative rose falls into this group.It also includes most of the fruit trees and shrubs, including apple, pear, cherry, rowan, raspberry, bird cherry, blackberry.
legume family - his form and woody shrubs, distributed mainly in tropical and subtropical countries, and grassy prefer a more moderate or even cold climate.All members of the group are characterized by specific whisk "papilionaceous" type.This group includes the following well-known plants: peas, beans, alfalfa, beans, soy.Incidentally, some species are actively involved in the nitrogen cycle.
Class Monocots: a brief description of
This group consists mainly of herbaceous plants - trees and shrubs in it are extremely rare.Their stems usually contain cambium and therefore not capable of growth in thickness.Leaves - simple, with full margins.They are not attached to the stem and the stem leaf blade edge, which is why they are called sessile leaves.Venation in most cases parallel or arc.
Another feature - a fibrous root system, which does not have the main root.The embryo has only one cotyledon, as evidenced by the class name.
Most monocots is pollinated by the wind.Therefore, their flowers - small, soft, single-perianth mostly trimerous.
Typical representatives of this group - cereals: wheat, oats, corn, rice and others.
