The “Philip A. Munz Field Notebook, Plant Collections 9866–10791” is a meticulously documented record of botanical observations and specimen collections made by renowned American botanist Philip A. Munz. This field notebook, spanning from 1924 to 1925, encompasses a series of plant specimens cataloged between numbers 9866 and 10791. The majority of these collections were made in Southern California, specifically within the counties of San Diego, Riverside, and San Bernardino. Munz’s detailed entries provide invaluable insights into the flora of the region during this period, serving as a historical reference for botanists and researchers.

Munz, who served as a professor of botany at Pomona College and later as the Executive Director of the Rancho Santa Ana Botanic Garden, was instrumental in advancing the study of California’s native plants. His extensive research culminated in the publication of “A Manual of Southern California Botany” in 1935 and “A California Flora” in 1960. These works have become foundational texts in the field of botany. The field notebook in question reflects Munz’s rigorous approach to plant collection and classification, documenting not only the species but also detailed notes on their habitats, flowering periods, and other pertinent ecological observations.

The notebook is a testament to Munz’s dedication to botanical research and his methodical approach to fieldwork. Each entry is accompanied by precise geographical data, including specific locations and environmental conditions, which are crucial for understanding the ecological context of the specimens. This level of detail not only aids in the identification and study of the plants but also provides a snapshot of the environmental conditions of early 20th-century Southern California. The meticulous nature of Munz’s documentation underscores the importance of thorough fieldwork in the advancement of botanical science.

The “Philip A. Munz Field Notebook, Plant Collections 9866–10791” is more than just a catalog of plant specimens; it is a comprehensive record that reflects the depth of Munz’s botanical expertise and his commitment to documenting the natural world. For those interested in the history of California’s flora, this notebook offers a rich resource that bridges the past with contemporary botanical studies. Its preservation and accessibility ensure that Munz’s contributions continue to inform and inspire future generations of botanists and environmental scientists.