Science magazines
- San Jacinto Valley Crownscale
- San Joaquin Adobe Sunburst
- San Joaquin Kit Fox
- San Joaquin Valley Orcutt Grass
- San Joaquin Valley Riparian Woodrat
- San Joaquin Woolly-threads
- San Marcos Gambusia
- San Marcos Salamander
- San Mateo Thornmint
- San Mateo Woolly Sunflower
- San Rafael Cactus
- Sand Skink
- Sandlace
- Sandplain Gerardia
- Sanicula Mariversa
- Sanicula Purpurea
- Santa Ana River Woolly-star
- Santa Barbara Island Liveforever
- Santa Clara Valley Dudleya
- Santa Cruz Cypress