Sterile stamen or staminode:

In several plants, a stamen might not develop any fertile anther. Such sterile stamens are termed as staminodes, example: Cassia.

Cohesion of Stamens:

Figure: Cohesion of stamens

Monadelphous:

Each stamens of a flower are combined in one bundle by fusion of their filaments only. The anthers are free, example: Abutilon, Hibiscus, and so on.

Diadelphous:

Each stamens of a flower are combined in two bundles by fusion of their filaments only. The anthers are free, example: Clitoria.

Polyadelphous:

The filaments of each stamen join to form more than two bundles. The anthers are free, example: Citrus.

Syngenesious:

Anthers of each stamens of the flower join to form a cylinder around the style. The filaments are free, example: Asteraceae.

Synandrous:

Anthers and also the filaments are fused all through their entire length, example: Cucurbitaceae.

Polyandrous:

Stamens are indefinite and free, example: Ranunculus.

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