Stamens united by their filaments into two groups describes which condition?

• A. Monoadelphous
• B. Diadelphous
• C. Polyandrous
• D. Epiphyllous

Answer: (B)

Two groups of stamens formed by their filaments fusing together is called diadelphous. The name breaks down as di- meaning two, and adelphous referring to bundles or joined filaments. In this arrangement the filaments of the stamens unite to form two distinct bundles rather than remaining completely free or all joining into a single stalk. This pattern is typical in many members of the legume family, where you often see stamens arranged as two separate masses around the pistil. This distinguishes it from monadelphous, where all stamens form one single bundle, and from other terms like epiphyllous (parts arising from a leaf) or polyandrous (many stamens not described as two bundles).