In Brassica, tetradynamous type of stamens are present.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Term "Tetradynamous":**
- The term "tetradynamous" refers to a specific arrangement of stamens in flowers. In this arrangement, there are six stamens in total, with four of them being longer and two shorter.

2. **Identifying the Flower Family:**
- The question mentions "Brassica," which is a genus within the family Brassicaceae, commonly known as the mustard family.

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