Which is false for Vexillary or papilionaceous aestivation ?

Options

A. Two smallest anterior petals are known as keel.
B. Two lateral petals are known as wing .
C. The largest standard petal is posterior.
D. The largest standard petal is anterior and overlaps wing

Answer

To determine which statement is false regarding Vexillary or papilionaceous aestivation, let's analyze the characteristics of this type of aestivation step-by-step.

### Step-by-Step Solution:

1. **Understanding Vexillary Aestivation**:
- Vexillary or papilionaceous aestivation is a type of floral arrangement where the petals are arranged in a specific manner. In this arrangement, one large petal (the standard) is positioned above the other petals.

2. **Identifying the Petal Types**:
- In Vexillary aestivation, there are typically five petals:
- **One large upper petal**: This is known as the standard.
- **Two lateral petals**: These are referred to as the wings.
- **Two smaller anterior petals**: These are called the keels.

3. **Analyzing the Statements**:
- **Statement 1**: "Two small anterior petals are known as keel."
- This statement is correct. The two smaller petals at the front are indeed called keels.
- **Statement 2**: "Two lateral petals, these lateral petals are called wings."
- This statement is also correct. The two petals on the sides are known as wings.
- **Statement 3**: "The largest standard petal is posterior."
- This statement is incorrect. The largest petal (the standard) is actually positioned anteriorly, not posteriorly.
- **Statement 4**: "The largest standard petal is anterior and overlapping."
- This statement is correct. The standard petal is indeed the largest and overlaps the other petals.

4. **Conclusion**:
- The false statement regarding Vexillary or papilionaceous aestivation is **Statement 3**: "The largest standard petal is posterior."

### Final Answer:
The false statement for Vexillary or papilionaceous aestivation is: **"The largest standard petal is posterior."**