Wolffia is the smallest flowering plant.

Explanation

### Step-by-Step Solution:

1. **Identify the Subject**: The question states that "Wolffia is the smallest flowering plant." We need to determine if this statement is true or false.

2. **Understand Wolffia**: Wolffia is an aquatic plant known for its extremely small size. It belongs to the family Lemnaceae, which includes duckweeds.

3. **Measure Size**: The size of Wolffia is very small, typically ranging from 0.4 to 1.33 mm in length and 0.2 to 1 mm in width. This measurement confirms its status as a tiny plant.

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