Other Sites
- Consortium of California Herbaria
- California Environmental Resources Evaluation System (CERES)
- CalPhotos
- Cal Flora
- Cal Weed Mapper
- Cybersedge Carex Images
- Flora of North America
- International Plant Names Index
- Tropicos
- Jepson Flora Project
- National Park Service: Species in Parks Flora and Fauna Database
Selected California Herbaria and Herbaria with California Collections
- California Academy of Sciences Herbarium
- California Polytechnic State University San Luis Obispo Hoover Herbarium
- California State University Chico
- Humboldt State University
- Mildred Mathias Botanic Garden, UCLA (herbarium)
- Missouri Botanical Garden
- United States National Herbarium
- New York Botanical Garden
- Rancho Santa Ana Botanic Garden Herbarium
- San Diego Museum of Natural History Herbarium
- San Diego State University Herbarium
- Santa Barbara Botanic Garden Herbarium
- University of California, Berkeley, University and Jepson Herbaria
- University of California, Davis
- University of California, Riverside
- University of California, Santa Barbara
Selected Non-governmental Organizations