Books:
* The Flora of Southern California: This is her most famous and comprehensive work, published in multiple editions. It includes detailed descriptions, illustrations, and ecological information about over 1,600 plant species found in southern California.
* Wildflowers of the Pacific Coast: A beautifully illustrated guide to the wildflowers of California, Oregon, and Washington.
* The Story of the California Poppy: A fascinating exploration of the California poppy, its history, folklore, and ecological significance.
* The Yosemite Flora: A guide to the wildflowers of Yosemite National Park.
* The Mountain Wildflowers of America: A guide to wildflowers found in mountainous regions across the United States.
Other Writings:
* Barrus also wrote numerous articles and essays for scientific journals and popular magazines about botany, nature, and conservation.
* She contributed to the development of several nature preserves and botanical gardens in California.
Clara Barrus was a passionate advocate for preserving the natural beauty and biodiversity of the West. Her writings continue to inspire and inform people about the wonders of the wildflower world.