Southern California Botanists
- Organization of individuals dedicated to the study and conservation of native plants and plant communities of southern California. Information about the journal, field trips and symposia, and membership.
- http://www.socalbot.org/

Yerba Buena Chapter, California Native Plant Society
- San Francisco chapter of the group with habitat restoration information, news, calendar, events, gardening, links, and photos.
- http://www.cnps-yerbabuena.org/

San Gabriel Mountains Chapter, California Native Plant Society
- Newsletter, programs, and outings in the Pasadena area.
- http://www.cnps-sgm.org/

California Native Plant Society
- A statewide non-profit organization of amateurs and professionals with an interest in California's native plants.
- http://www.cnps.org/

California Native Grasslands Association
- Aims to preserve and restore native grasses and grassland ecosystems of California. Site provides guides to grasslands around the state, event calendar and newsletter, and information about products and services.
- http://www.cnga.org/