The different types of androecium found in flowers are- Polyandrous – When a flower's stamens are free, the state is known as polyandrous. Monadelphous - Monadelphous refers to a state in which the filaments of anthers in a flower are merged into a single group. Diadelphous: Diadelphous is when the filaments of anthers in a flower are united into two groups. Polyadelphous: Polyadelphous is a phenomenon in which the filaments of an anther of a flower are united into more than two groups.