Odd sepal is anterior in Papilionaceae.

Explanation

### Step-by-Step Solution

1. **Understanding the Papilionaceae Family**:
- The Papilionaceae family, also known as the legume family, is characterized by its unique flower structure.

2. **Identifying the Odd Sepal**:
- In this family, one of the sepals is referred to as the "odd sepal". This odd sepal is positioned anteriorly, meaning it is located towards the front or the center of the flower.

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