A Greek word came to Latin as androecium and then to Spanish as androecium . It's about a concept used in the field of botany with reference to male whorl of flowers in spermatophytic plants (also known as phanerogams).
The whorls are at least three organs or appendages that are in the same plane around a stem. In the case of androceo, it is composed of stamens (male organs of the flower). It can be said, in this way, that the androceo is the sector of the flower where the male gametes . These gametes are found in the grains of pollen .
Androceo stamens are made up of filament and the anther . The filament is the sterile part of the androceo; its extension varies in each case: it can be very short or very long, or even absent. When the latter occurs, the anthers are said to be sessile, that is, they are subject to substratum in the absence of the support that the filament would provide. Although it is usually shaped like a thread, it can also have certain appendages and have a considerable thickness, so we do not speak of a strict aspect for all individuals.
Unlike the filament, the anther is the part fertile of androceo. It is normal for it to consist of two teak (cells within which spore formation occurs; each of them has two microsporangia or pollen sacs), as occurs in the case of Malvaceae; the MegatrithecaInstead, they have three. A sterile portion of tissue known as connective He is in charge of joining the teak.
From the anther the exit of the pollen It contains gametes. This exit, known as dehiscence , can be carried out in different ways according to how the opening of the anther occurs. It takes place after the maturation of pollen grains and the tissue responsible for this task is called endothelium.
When the opening of the anther of the androceo occurs in all the extension of the partition that divides the sacks of pollen, what happens more frequently, we talk about longitudinal dehiscence . In the Lachemilla and the Hippocratea, on the other hand, the so-called transversal dehiscence .
These are not the only two possibilities of dehiscence in androceo, but there are others that are characterized by a location in limited regions, which rise as windows or leaflets; It is the case of the poricidal dehiscence , in which there is no tissue endothelium and that is why pollen is removed by breaking the tissue at the upper end of the anther and forming specific pores for this task.
The number of stamens in androceo is very variable: in some cases it can be only one, as it happens in some Euphorbiaceae; the Oleaceae, on the other hand, they have two; in the Mirtáceas, several are appreciated. Taking these examples into account, the names given to flowers according to their number of stamens they are monandras, diandras and polyandrasrespectively.
It should be noted that, in the structure of the flower, androceo surrounds the gynoecium : the female reproductive part that consists of carpels. Usually, the androceo is in the perianto, that is formed with the sepals and the petals. It is important to mention that the androceo can be shorter or more extensive than the perianto, sometimes excelling it. On the other hand, the position of the whorls also varies according to the floral species.