Stamen
Male reproductive organ of a flower, producing pollen.
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The stamen is the male reproductive organ of a flower, collectively forming the androecium. Typically composed of a filament and an anther containing microsporangia, stamens produce pollen grains that carry the male gametophyte. Their morphology varies widely across species, from a single half-stamen in Canna to thousands in the saguaro cactus.
Quick Facts
- Part of
- Flower
- Function
- Male reproduction
- Collective term
- Androecium
- Typical components
- Filament and anther
- Pollen origin
- Microsporangium
- Size range
- Fraction of a millimeter to 13 cm / 5.12 in
Facts from the source article.
Lore & Background
The stamen typically consists of a stalk called the filament and an anther that contains microsporangia. Most commonly, anthers are two-lobed, each lobe termed a locule, and are attached to the filament at the base or middle.
The sterile tissue between the lobes is the connective, an extension of the filament containing conducting strands. Pollen grains develop from microspores within the microsporangium and contain the male gametophyte. Anther size varies dramatically, from a tiny fraction of a millimeter in Wolfia species to five inches (13 centimeters) in Canna iridiflora and Strelitzia nicolai.
Reader's Guide
The stamen is fundamental to plant sexual reproduction, as it produces and releases pollen that must reach a compatible stigma for fertilization. Its structure and arrangement are highly diverse: stamens may be free or fused, attached to petals or the floral axis, and can vary in number from a single half-stamen to thousands.
The androecium generally surrounds the gynoecium and is surrounded by the perianth, though exceptional species like Lacandonia schismatica reverse this arrangement. Pollen release occurs through anther dehiscence via slits, pores, or valves, and in some families like Orchidaceae, pollen remains in masses called pollinia adapted to specific pollinators. The terminology for stamen fusion, attachment, and arrangement is extensive, reflecting the complexity of floral evolution.
Did You Know?
- The word 'stamen' is Latin for 'thread', originally referring to the warp thread in weaving.
- In some species of Cyclanthera and Phyllanthus, stamens fuse into a ring around the gynoecium with a single locule.
- A few members of Triuridaceae, such as Lacandonia schismatica, have gynoecia that surround their androecia, reversing the typical arrangement.
Frequently Asked Questions
What is a stamen in botany?
A stamen is the male reproductive structure of a flower, responsible for producing pollen. It is the counterpart to the female pistil and is the part of the bloom that ultimately delivers the male gametophyte to another flower during pollination.
What parts make up a typical stamen?
Most stamens consist of two main components: a slender stalk called the filament and a swollen tip called the anther. Inside the anther are microsporangia, the tiny chambers where pollen grains are actually generated.
What is the collective term for all the stamens in a flower?
When you look at a flower and see all its stamens together, that whole group is called the androecium. It sits between the outermost whorl (the calyx) and the central pistil in a typical floral arrangement.
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Sources
Compiled from Wikipedia and the sources listed below. Text from Wikipedia is available under CC BY-SA 4.0; this entry is adapted from it.
- Wikipedia: Stamen (CC BY-SA 4.0).
- Word definitions: the Codexery glossary, each quoted from its Wikipedia article.
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