Parts of a Flower - Androecium
- Androecium is the male reproductive whorl of the flower.
- It is made up of stamens.
- Each stamen is made up of filament and anther.
- Each anther is generally bilobed with four pollen sac or microsporangia.
- The pollen grains are produced in pollen sac.
- A sterile stamen is called staminode.
I. Cohesion of Androecium:
- When stamens are united with each other, it is called cohesion of androecium. It is of following three types:
- Adelphous: The stamens are fused by their filaments only. The anthers are free. When the fusion of filament produces a single group, it is called monadelphous, e.g., Hibiscus. When two groups are formed, it is called diadelphous, e.g. pea. When many groups are produced, it is called polyadelphous, e.g., Citrus.
- Syngenesious/Synantherous: Stamens are fused by anthers only. Filaments are free. E.g., sunflower.
- Synandrous: Stamens are fused both in the region of filaments and anthers. E.g., cucumber.

II. Adhesion of Androecium:
- When stamens are attached to other members of the flowers, it is called the adhesion of androecium.
- Epipetalous: When stamens are attached to the petals, they are called epipetalous, for example, brinjal.
- Epiphyllous: When stamens are attached to the perianth, they are called epiphyllous, for example, lily.
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Epiphyllous condition is seen in lily.
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