“Contributions from the United States National Herbarium, Volume 20, Part 4” is a significant botanical work published by the Smithsonian Institution between 1917 and 1925. This volume is part of a broader series aimed at documenting the rich plant biodiversity of the Americas. Specifically, this part focuses on the Mexican and Central American species of the genus Ficus, commonly known as fig trees. The study provides detailed descriptions, classifications, and illustrations of various Ficus species, contributing to a deeper understanding of their taxonomy and distribution in the region.​

The research presented in this volume is the result of extensive fieldwork and herbarium studies conducted by botanists associated with the United States National Herbarium. It reflects the scientific rigor and dedication of early 20th-century botanists in cataloging plant species. The meticulous documentation includes morphological descriptions, habitat information, and notes on the geographical range of each species. Such comprehensive studies were crucial for the development of botanical sciences and for informing conservation efforts.​

This volume serves as a valuable reference for botanists, ecologists, and researchers interested in the flora of Mexico and Central America. It not only enhances our knowledge of the Ficus genus but also provides insights into the ecological significance of these species in their native habitats. The work underscores the importance of preserving botanical diversity and the need for continued research in plant taxonomy and ecology.​

“Contributions from the United States National Herbarium, Volume 20, Part 4” stands as a testament to the enduring value of systematic botanical research. It exemplifies the traditional scientific approach to studying plant life, emphasizing careful observation, classification, and documentation. Such works lay the foundation for modern botanical studies and continue to inform our understanding of plant biodiversity and conservation.