In papilionaceous flower the innermost petal unite to form a boat shaped structure called

Options

A. alae
B. carina
C. vaxillum
D. wings

Answer

To answer the question "In papilionaceous flower the innermost petal unite to form a boat-shaped structure called," we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of Papilionaceous Flowers**:
- Papilionaceous flowers, commonly found in the Fabaceae family, have a specific arrangement of petals. They consist of five petals: one standard petal, two wing petals, and two innermost petals.

2. **Identify the Petal Arrangement**:
- The arrangement of petals in papilionaceous flowers is known as vexillary estivation. In this arrangement, the petals are organized in a unique way where the innermost petals are fused together.

3. **Focus on the Innermost Petals**:
- The two innermost petals that are fused together form a structure that resembles a boat. This structure is crucial for the flower's reproductive functions.

4. **Name the Boat-Shaped Structure**:
- The fused innermost petals are referred to as the "Carina." This term is synonymous with the keel, which is the boat-shaped structure formed by the fusion of these two petals.

5. **Conclusion**:
- Therefore, in a papilionaceous flower, the innermost petals unite to form a boat-shaped structure called the "Carina."

### Final Answer:
The innermost petals unite to form a boat-shaped structure called the **Carina**.

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