The typical floral formula of Papilionaceae (Soybean) is

Options

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Explanation

To determine the typical floral formula of the Papilionaceae family (which includes soybean), we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Family and Sub-family**:
- The Papilionaceae is a sub-family of the Fabaceae family (also known as Leguminosae).

2. **Understand the Floral Structure**:
- The floral structure consists of four main parts: calyx, corolla, androsium, and gynosium.

3. **Analyze the Corolla**:
- The corolla of Papilionaceae typically has five petals. The arrangement of these petals is described as 1 + 2 + 2. This means:
- 1 standard petal (the largest petal)
- 2 lateral petals (wings)
- 2 lower petals (keel)

4. **Examine the Androsium**:
- The androsium consists of 10 stamens. The arrangement is described as 1 + 9, which indicates:
- 1 stamen is separate
- 9 stamens are fused together (this is known as diadelphous condition).

5. **Review the Gynosium**:
- The gynosium is monocarpillary, meaning it has one carpel. It is also unilocular (one chamber) and has a superior ovary.

6. **Compile the Floral Formula**:
- Based on the above observations, the floral formula for Papilionaceae can be summarized as follows:
- **Floral Formula**:
- **K(5) C(1 + 2 + 2) A(1 + 9) G(1)**
- Where:
- K = Calyx (5 sepals)
- C = Corolla (5 petals in the arrangement of 1 + 2 + 2)
- A = Androsium (10 stamens in the arrangement of 1 + 9)
- G = Gynosium (1 carpel, superior ovary)

### Final Answer:
The typical floral formula of Papilionaceae (Soybean) is:
**K(5) C(1 + 2 + 2) A(1 + 9) G(1)**