Tetradynamous stamens are found in

Options

A. Cruciferae
B. Labiatae
C. Compositae
D. Graminae

Answer

**Step-by-Step Solution:**

1. **Understanding Tetradynamous Stamens**:
- Tetradynamous stamens refer to a specific arrangement of stamens in flowers where there are a total of six stamens: four are long and two are short. This unique arrangement is a key characteristic of certain plant families.

2. **Identifying the Family**:
- The family that is known for having tetradynamous stamens is the Cruciferae (now known as Brassicaceae). This family includes plants like mustard and cabbage, which exhibit this particular stamen arrangement.

3. **Evaluating Other Options**:
- The second option mentions the family Lamiaceae (formerly known as Labiatae), which typically has a di-dynamous arrangement (two long and two short stamens).
- The third option refers to the family Asteraceae (formerly Compositae), which generally has a different arrangement of stamens.
- The fourth option mentions the family Poaceae (Gramineae), which usually has a polyandrous arrangement (multiple stamens, often more than six).

4. **Conclusion**:
- Based on the definitions and characteristics of the stamens in the mentioned families, the correct answer to the question is that tetradynamous stamens are found in the **Cruciferae (Brassicaceae)** family.

**Final Answer**: Tetradynamous stamens are found in the family **Cruciferae (Brassicaceae)**.

---