What is a monograph?

Explanation

### Step-by-Step Solution:

1. **Definition of Monograph**: A monograph is a detailed written study or document that focuses on a specific subject or taxon.

2. **Descriptive Information**: It provides descriptive information about a particular taxon, which could include species, genus, family, or order.

3. **Purpose of a Monograph**: The primary purpose of a monograph is to serve as a comprehensive resource for understanding the characteristics, classification, and other relevant details of the taxon it covers.

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