Sign stimulus (releaser)

The essential feature of a stimulus, which is necessary to elicit a response.

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Androecium

Each anther is usually bilobed and each lobe has two chambers, the pollen-sacs.

The pollen grains are produced in pollen-sacs. A sterile stamen is called staminode

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Union of stamen

Stamens of flower may be united with other members (adhesion) such as petals or among themselves (cohesion)

Adhesion of stamen

When stamens are attached to the petals, they are epipetalous  e.g., brinjal, Datura (solanaceae)

Adhesion of stamen

when attached to the perianth called epiphyllouse.g., lily (liliaceae), Asperagus (asparagaceae)

Adhesion of stamen

Stamen may unite with gynoecium called gynandrous, it is also called gynandrium or gynostegium' e.g., calotropis (apocynaceae)

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Cohesion of stamens

Adelphous

Anthers remain free, and filaments are united. Adelphous condition can be;

Monadelphous–  The stamens may be united into one bunch or one bundle. e.g., china rose  (malvaceae)

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Adelphous 

Diadelphous– The stamens united to form two bundles. e.g., Pea (Papilionaceae)

Adelphous 

Polydelphous– The stamens united into more than two bundles. e.g., Lemon (Rutaceae)

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Synandrous

Stamens fused all through their length. e.g., Cucurbita 

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