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How are the stamens arranged in many Faboideae flowers?
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Fabales
A flowering stalk of yellow partridge pea (Chamaecrista fasciculata) in the eastern United States.
In the subfamily Faboideae (also known as Papilionoideae), the stamens are typically 10 in number, though there may be fewer or more. Their arrangement is characterized by the following patterns:
- Free: In a few tribes, the stamens remain separate from one another.12
- Monadelphous: The stamens are fused at their filaments into a single tubular structure.12
- Diadelphous: The stamens are fused into a group of nine united filaments, with one stamen remaining free above them.12
These stamens are typically enclosed by the keel, a structure formed by the two lower petals of the flower.2