What is the function of pulvinus? Give one example of the plant having it.

Explanation

### Step-by-Step Solution:

1. **Definition of Pulvinus**:
- The pulvinus is a swollen part of the leaf base. It is specifically the area where the leaf attaches to the stem or branch of the plant.

2. **Function of Pulvinus**:
- The primary function of the pulvinus is to provide flexibility and movement to the leaf. It helps in the attachment of the leaf to the stem, allowing the leaf to adjust its position in response to environmental stimuli such as light and gravity.

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