Androecium

Subject: Biology

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Overview

The androecium is the male reproductive whorl individual unit of which is stamen. This note contains detail information about androecium, its attachment with anther and filament, length of stamen, cohesion of stamen and adhesion of stamen.
Androecium

The androecium is the male reproductive whorl individual unit of which is stamen. Each stamen consists of fertile anther joined with filament with the help of connective tissue. Anther may be single lobed or bilobed in nature. Single lobed anther is known as monothecous anther and two lobe anther is known as dithecous anther.

Attachment of anther and filament:

sc

source:www.biologydiscussion.com

fig:Attachment of anther and filament

Basifixed:

The filament is attached to the base of the anther.

Adnate:

It is also basifixed type in which the connective runs throughout the length of anther and protrudes out from the apex.

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Dorsifixed:

The filament is attached to the dorsal surface of another.

Versatile:

Filament just touches the dorsal side of another so that the anther can easily swing.

Length of stamens

fs

source:crescentok.com

fig:Length of stamens

Didynamous:

The presence of 4 stamens, 2 with short filaments and 2 with long filaments. Eg; Ocimum ((Tulsi).

Tetradynamous:

The presence of 6 stamens in two whorls, outer 2 with short filaments and inner 4 with long filaments. Eg; Cruciferae

Cohesion of stamens:

If the stamens are free, the condition becomes polyandrous as the stamen has two parts, the cohesion or fusion of stamens occur in different ways which can be categorized into three conditions:

Form of cohesion of stamens
source:www.biologydiscussion.com
fig:Form of cohesion of stamens
Syngenesious:

Anther is fused, a filament is free. Eg; Compositae

Adelphous:

In this, the filament is fused and anther is free. It is of three types they are:

Monadelphous:

Filaments fused into a single bundle or staminal tube. Eg; Hibiscus

Diadelphous:

Filaments fused into two bundles. Eg; Pisum

Polyadelphous:

Filaments fused to form more than two bundle. Eg; Rosa

Synandrous:

In this type, the stamens are completely fused.

Adhesion of stamens

Epipetalous: Stamens( filaments) attached with the petals.

Gynandrous: Stamens (filaments) attached with the gynoecium.

Things to remember
  • The androecium is the male reproductive whorl individual unit of which is stamen. 
  • Single lobed anther is known as monothecous anther and two lobe anther is known as dithecous anther.
  •  Anther may be single lobed or bilobed in nature.
  •   In epipetalous stamens( filaments) is attached with the petals.
  • In polyadelphous filaments fused to form more than two bundle. Eg; Rosa

 

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