Engler and Prantl published a phylogenetic system in monograph

Options

A. Species plantarum
B. Taxonomic system
C. Origin of species
D. Phylogeny of flowering Plants

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks about the monograph published by Engler and Prantl that relates to a phylogenetic system. We need to identify the correct title of this monograph from the given options.

2. **Defining Key Terms**:
- **Phylogenetic System**: This refers to a classification system based on the evolutionary relationships among organisms. It emphasizes how species are related through common ancestry.
- **Monograph**: A monograph is a detailed written study or account of a single specialized subject or an aspect of it. In taxonomy, it often refers to a comprehensive treatment of a particular group of organisms.

3. **Evaluating the Options**:
- **Species Plantarum**: This is a famous work by Carolus Linnaeus that laid the foundation for modern botanical nomenclature.
- **Taxonomic System**: This term refers to the classification of organisms based on their similarities and differences. It aligns with the concept of a phylogenetic system.
- **Origin of Species**: This is a well-known book by Charles Darwin that discusses the theory of evolution and natural selection.
- **Phylogeny of Flowering Plants**: This is a work by Peter Stevens that discusses the evolutionary relationships among flowering plants.

4. **Identifying the Correct Answer**: Given that Engler and Prantl published a taxonomic system in a monograph, the correct answer is **Taxonomic System**.

5. **Conclusion**: The correct option is the second one, which is **Taxonomic System**.