Epicalyx is a characteristic feature of

Options

A. hibiscus
B. petunia
C. rose
D. all of these

Answer

To solve the question regarding which plant has the characteristic feature of an epicalyx, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Term "Epicalyx":**
- The epicalyx is a structure that is found in some plants, which resembles the calyx and is located outside of it. It is an additional whorl of bracts that can provide support or protection to the flower.

2. **Identify the Options:**
- The options provided are:
- A) Hibiscus
- B) Petunia
- C) Ribose
- D) All of these

3. **Analyze Each Option:**
- **Option A: Hibiscus**
- Hibiscus belongs to the Malvaceae family and is known to have an epicalyx. This structure is often seen in the flowers of hibiscus.
- **Option B: Petunia**
- Petunia does not have an epicalyx. It has a typical calyx and corolla structure but lacks the additional whorl that defines an epicalyx.
- **Option C: Ribose**
- Ribose is not a plant but a sugar molecule, so it cannot have an epicalyx.
- **Option D: All of these**
- Since only Hibiscus has an epicalyx, this option cannot be correct.

4. **Conclusion:**
- Based on the analysis, the only plant that exhibits the characteristic feature of an epicalyx is **Hibiscus**. Therefore, the correct answer is **Option A: Hibiscus**.

### Final Answer:
**Option A: Hibiscus**