Which of the following is not a characteristic feature of Fabaceae

Options

A. Corolla five petals, gamopetalous papilionaceous
B. Zygomorphic flowers, diadelphous stamens , many ovules
C. Sepals five,gamosepalous, imbricate aestivation, placentation marginal
D. Monocarpellary, ovary superior, seeds non-endospermic

Answer

To solve the question "Which of the following is not a characteristic feature of Fabaceae?", we will analyze each option provided and determine if it is a characteristic of the Fabaceae family.

### Step-by-step Solution:

1. **Understanding Fabaceae Family**:
- The Fabaceae family, also known as the legume, pea, or bean family, includes plants that typically have specific floral and fruit characteristics.

2. **Analyzing the First Option**:
- **Corolla has five petals**: This is correct. Flowers in the Fabaceae family usually have five petals.

3. **Analyzing the Second Option**:
- **Gammopetalus**: This term means that the petals are fused together. In Fabaceae, the petals are actually polypetalus (separate) and often have a butterfly-like shape (papilionaceous). Thus, this statement is incorrect.

4. **Analyzing the Third Option**:
- **Zygomorphic flowers**: This is correct. Fabaceae flowers are zygomorphic, meaning they have one plane of symmetry.

5. **Analyzing the Fourth Option**:
- **Didelpha stamens**: This refers to the arrangement of stamens in groups of two. This is also a characteristic of Fabaceae, so it is correct.

6. **Analyzing the Fifth Option**:
- **Many ovules**: This is correct as well. Fabaceae typically have many ovules.

7. **Analyzing the Sixth Option**:
- **Sepals five**: This is correct. Fabaceae flowers usually have five sepals.

8. **Analyzing the Seventh Option**:
- **Gamosepless**: This means the sepals are fused. In Fabaceae, the sepals are typically separate, so this is incorrect.

9. **Analyzing the Eighth Option**:
- **Monocarpillary**: This means there is one carpel present, which is correct for many Fabaceae.

10. **Analyzing the Ninth Option**:
- **Ovary is superior**: This is also correct for Fabaceae.

11. **Analyzing the Tenth Option**:
- **Seed is non-endospermic**: This is correct. Fabaceae seeds do not have endosperm in the mature seed.

### Conclusion:
The characteristic that is not true for Fabaceae is **Gammopetalus** (the petals are not fused). Therefore, the correct answer is the second option.