An achlamydeous flower with a single stamen is found in

Options

A. Head
B. Cyathium
C. Umbel
D. Catkin

Answer

To solve the question about an achlamydeous flower with a single stamen, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Term "Achlamydeous":**
- An achlamydeous flower is one that lacks both petals (corolla) and sepals (calyx). This means the reproductive parts of the flower are exposed and not covered by any floral structures.

2. **Identify the Reproductive Parts:**
- The main reproductive parts of a flower are the stamen (male part) and the pistil (female part). In this case, we are focusing on a flower with a single stamen.

3. **Analyze the Options Given:**
- The options provided are: head, sciatium, umbil, and catechine. We need to determine which of these options can have an achlamydeous flower with a single stamen.

4. **Evaluate Each Option:**
- **Head:** Typically refers to a cluster of flowers, not a single flower structure.
- **Sciatium:** This is a type of inflorescence that can have flowers with exposed reproductive parts, and it can feature a single stamen.
- **Umbil:** This term does not refer to a specific flower type known for having a single stamen.
- **Catechine:** This is a type of flavonoid compound, not a flower structure.

5. **Conclusion:**
- Based on the analysis, the correct answer is **sciatium**, as it can have achlamydeous flowers with exposed reproductive parts, including a single stamen.

### Final Answer:
An achlamydeous flower with a single stamen is found in **sciatium**.