Flowers are trimerous and hypogynous in family Papilionaceae.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Terms:**
- The term "trimerous" refers to flowers that have parts in multiples of three, such as three petals, three sepals, etc.
- "Hypogynous" refers to the position of the ovary being superior, meaning that the ovary is located above the other floral parts (like petals and sepals).

2. **Identifying the Family:**
- The question states that the flowers are from the family Papilionaceae, which is also known as Fabaceae (the legume family).
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