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
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.
Each stamens of a flower are combined in two bundles by fusion of their filaments only. The anthers are free, example: Clitoria.
The filaments of each stamen join to form more than two bundles. The anthers are free, example: Citrus.
Anthers of each stamens of the flower join to form a cylinder around the style. The filaments are free, example: Asteraceae.
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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