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Androecium

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by

Dabbor Gml

on 8 December 2012

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Transcript of Androecium

Androecium the male organ of the flower Types of Androecium Cohesion of the stamens Monaadelphous Diadelphous Polydelphous Structure : Consists of 2 anther-lobes , each one
contains 2 pollen sacs if it's absent
,the stamen is called sessile each Stamen consists of 2 parts filaments are fused in One Group filaments are fused in Two Groups filaments are fused in Several Groups consists of Stamens Filament Anther Function : Produces pollen grains According to : number
of
stamens number of whorls
and
position to petals Length of stamens Monandrous Diandrous Triandrous Polyandrous 1
stamen 2
stamens 3
stamens indefinite number of stamens Didynamous Tetradynamous 2 long + 2 short stamens 4 long +2 short stamens Haplostamenous Antipetalous -stamens are in one whorl
-stamens alternate with petals - -stamens are in one whorl
-stamens opposite to petals -stamens are in two whorls
alternating with each other
- outer whorl of stamens alternate with petals Diplostamenous Odbiplostamenous -stamens are in two whorls
alternating with each other
- outer whorl of stamens
opposite to petals Syngenecious filaments are Free , but the anthers cohere Insertion of Stamens 1- stamen may be inserted upon the ovary :




2- adhere to the style giving compound structure: a- hypogynous
b- perigynous
c- epigynous
d- epipetalous
e- gynandrous gynostemium
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