Perigynous or epigynous flowers with free petals occur in

Options

A. Thalamiflorae
B. Disciflorae
C. Calyciflorae
D. Heteromerae.

Answer

**Step-by-Step Text Solution:**

1. **Understanding the Terms**:
- First, we need to clarify what "perigynous" and "epigynous" flowers are.
- Perigynous flowers have a hypanthium (a floral structure) that surrounds the ovary but does not fuse with it, while epigynous flowers have a hypanthium that is fused with the ovary.

2. **Identifying Free Petals**:
- Free petals refer to petals that are not fused together. This condition is termed as "holopetalous".

3. **Classification Reference**:
- According to Bentham and Hooker’s classification of angiosperms, certain families are categorized under the "calcipori series".

4. **Characteristics of Calcipori Series**:
- The calcipori series includes families that exhibit either perigynous or epigynous flowers, and importantly, these flowers have free petals.

5. **Conclusion**:
- Therefore, the correct answer to the question of which flowers have perigynous or epigynous structures with free petals is the "calcipori" series.

**Final Answer**: Calcipori series.

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