Among the following a plant species of medicinal value is endangered

Options

A. Butea frondosa
B. Rauwolfia serpentina
C. Cocus nucifera
D. Mangifera indica

Answer

To determine which plant species of medicinal value is endangered among the options provided, we can analyze each option based on their medicinal uses and their conservation status.

### Step-by-Step Solution:

1. **Identify the Options**: The question presents four plant species. We need to analyze each one for its medicinal value and conservation status.

2. **Analyze Butea frondosa**:
- This plant is widely used in Ayurveda, Yunani, and homeopathic medicine.
- It is known to treat various ailments such as thirst sensation, gout, leprosy, skin diseases, and eye diseases.
- **Conservation Status**: While it has medicinal value, it is not currently classified as endangered.

3. **Analyze Rauwolfia serpentina**:
- This plant is significant in the medicinal field, particularly for its use in treating high blood pressure and mental disorders.
- It is known for its broad medicinal applications and is part of the Rauwolfia alkaloids.
- **Conservation Status**: This plant has been heavily exploited due to its medicinal properties, leading to its endangered status.

4. **Analyze Coccus nusifera**:
- Commonly known as the coconut palm, it has various uses including being a diuretic and laxative.
- **Conservation Status**: This plant is not endangered and is widely cultivated.

5. **Analyze Mangifera indica**:
- Known as the mango tree, it is used for treating anemia, diabetes, and digestive issues.
- **Conservation Status**: This plant is also not endangered and is cultivated in large quantities.

6. **Conclusion**: After analyzing all four options, Rauwolfia serpentina stands out as the plant species of medicinal value that is endangered due to over-exploitation and limited availability.

### Final Answer:
The plant species of medicinal value that is endangered among the options is **Rauwolfia serpentina**.