stamen

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stamen,

one of the four basic parts of a flowerflower,
name for the specialized part of a plant containing the reproductive organs, applied to angiosperms only. A flower may be thought of as a modified, short, compact branch bearing lateral appendages.
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. The stamen (microsporophyll), is often called the flower's male reproductive organ. It is typically located between the central pistil and the surrounding petals. A stamen consists of a slender stalk (the filament) tipped by a usually bilobed sac (the anther) in which microspores develop as pollenpollen,
minute grains, usually yellow in color but occasionally white, brown, red, or purple, borne in the anther sac at the tip of the slender filament of the stamen of a flowering plant or in the male cone of a conifer.
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 grains. The number of stamens is a factor in classifying plant families, e.g., there are 5 (or multiples of 5) in the rose family and 10 in the pulse family. In most flowers the stamens are constructed so as to promote cross-pollination and to avoid self-pollination; e.g., they may be longer than the pistil or may be so placed in relation to the pistil (as in the mountain laurel and the lady's-slipper) as to prevent the pollinating insect from transferring the pollen of a flower to its own pistil. There may be differing maturation times for the stigma of the pistil and for the anther. In some plants there are some flowers (staminate) that bear stamens and no pistil and others (pistillate) that have a pistil and no stamens; these flowers may be borne on the same or on separate plants of the same species. In some highly developed flowers, especially double ones, and in some horticultural varieties (e.g., the geranium) the stamen may be modified into a sterile petallike organ.

Stamen

 

the reproductive organ of the flower of angiosperms in which the pollen grains are formed. The stamen is homologous to the microsporophyll. A typical stamen consists of an anther filament, which contains a vascular bundle, and an anther, the symmetrical halves of which are joined by a strand attached to the anther filament. Microspores are formed from the cells of the archesporium after meiosis. In each of the four nidi of the anther (microsporangia), the microspores sprout into male gametophytes—pollen grains. The aggregate of stamens of a flower is called the androecium. The stamens are arranged on the torus spirally (as in many Ranunculaceae) or in circles. Stamens arranged spirally may range from one to numerous; those arranged in a circle usually number from three to ten. Stamens may concresce with the anthers (Compositae), the filaments (legumes), or entirely (some Cucurbitaceae). They sometimes concresce with other parts of the flower, for example, the corolla (many sympetallous plants) or the pistil (some Orchidaceae).

A. N. SLADKOV

stamen

[′stā·mən]
(botany)
The male reproductive structure of a flower, consisting of an anther and a filament.

stamen

the male reproductive organ of a flower, consisting of a stalk (filament) bearing an anther in which pollen is produced
References in periodicals archive ?
anomalus landed on the petals or on the anthers, sustaining themselves on the staminal tobe, or more commonly, they leaned the dorsal side of the abdomen and wings against the basal region of the corola.
anomalus females and males folded their bodies onto the staminal tube in order to reach the nectariferous tissue, where they inserted their proboscises.
canjerana, the ovules of the male flowers are small and morphologically deformed, male and female flowers have different size and staminal tube shape (Fuzeto et al.
Staminal modifications: all stamens fertile=0; sterile staminodia present= 1.
In the axil of a newly formed glume, a spherical to ellipsoid floral primordium soon appears and expands laterally, forming two lateral staminal primordia.
The lateral staminal primordia are either the first to appear on the floral primordium, or they originate simultaneously with the abaxial stamen primordium.
Staminodes belonging to a staminal whorl may also become secondarily petaloid, a s in the Zingiberales (e.
He observed that the staminal glands arise late in ontogeny from lateral meristematic regions of the stamens.
Nectar is secreted on the sides of this staminal foot, and in some cases the area between adjacent feet is also nectariferous.
First, in species with a relatively long corolla tube, this staminal foot runs down the tube from the anthers and may fade out before the base (e.
morphic or slightly zygomorphic to bilabiate (Ferdinandusa); rarely staminal flowers forming a pseudanthium (Theligonum).
The staminal, pollinial, and coronal data given by Safwat (1962) which has been widely and uncritically used by other workers is open to differing interpretation and does not necessarily support a monophyletic line from the Apocynaceae through the Periplocoideae and Secamonoideae to the Asclepiadoideae.