Polyadelphous arrangement is observed in Castor and Lemon; which option lists this correctly?

• A. Papilionaceae
• B. Asteraceae
• C. Brassicaceae
• D. Castor and Lemon

Answer: (D)

Polyadelphous arrangement means the stamens are organized into several distinct bundles by their filaments, rather than forming one single tube or only two groups. Castor and Lemon both show this pattern, with their numerous stamens arranged as multiple filament bundles around the style, giving a multi-bundled appearance. This is different from the diadelphous condition seen in many Papilionaceae (stamens split into two bundles), and from the typical tetradynamous pattern of Brassicaceae (four long and two short, not multiple bundles). Asteraceae often have many stamens that are free or fused in other ways, not the classic polyadelphous arrangement. So Castor and Lemon correctly illustrate polyadelphous stamens.