- Saltgrass
- Picture 1
- Picture 2
- Picture 3
- San Fernando Valley spineflower
- Picture 1 (Rare)
- Picture 2 (Rare)
- Picture 3 (Rare)
- Picture 4 (Rare)
- San Luis mariposa lily
- Picture 1 (Rare)
- Picture 2 (Rare)
- Picture 3 (Rare)
- Picture 4 (Rare)
- Picture 5 (Rare)
- Picture 6 (Rare)
- Picture 7 (Rare)
- Picture 8 (Rare)
- Picture 9 (Rare)
- San Luis Obispo dudleya
- Picture 1
- Picture 2
- Picture 3
- San Miguel Island buckwheat
- Sand aster
- Sand mat
- Picture 1
- Picture 2
- Sand mesa manzanita
- Sand spurrey
- Picture 1
- Picture 2
- Picture 3
- Sandwort
- Santa Monica Mountains dudleya
- Picture 1 (Rare)
- Picture 2 (Rare)
- Picture 3 (Rare)
- Picture 4 (Rare)
- Picture 5 (Rare)
- Picture 6 (Rare)
- Santa Susana tarplant
- Picture 1 (Rare)
- Picture 2 (Rare)
- Picture 3 (Rare)
- Picture 4
- Saw-toothed goldenbush
- Picture 1
- Picture 2
- Picture 3
- Scarlet bugler
- Picture 1
- Picture 2
- Scarlet larkspur
- Picture 1
- Picture 2
- Picture 3
- Scarlet monkey flower
- Picture 1
- Picture 2
- Sclerapoa
- Scrub oak
- Sea dahlia
- Picture 1
- Picture 2
- Picture 3
- Sea fig
- Picture 1
- Picture 2
- Picture 3
- Sea rocket
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Picture 5
- Picture 6
- Picture 7
- Picture 8
- Seaside daisy
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Picture 5
- Seaside painted cup
- Seaside woolly sunflower
- Picture 1
- Picture 2
- Sedge
- Setaria
- Shaw's agave
- Sheep sorrel
- Picture 1
- Picture 2
- Shepherd's purse
- Shiny leaf barberry
- Picture 1
- Picture 2 (berries)
- Picture 3
- Shiny lomatium
- Picture 1
- Picture 2
- Picture 3 (fruits)
- Shooting star
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Picture 5
- Picture 6
- Picture 7
- Showy island snapdragon
- Picture 1
- Picture 2
- Picture 3
- Showy penstemon
- Shredding evening primrose
- Picture 1
- Picture 2
- Silk tassel bush
- Picture 1
- Picture 2
- Picture 3
- Silver lotus
- Picture 1
- Picture 2
- Silver puffs
- Picture 1 (fruiting head)
- Picture 2
- Picture 3
- Silverweed
- Six-weeks fescue
- Picture 1
- Picture 2
- Skullcap
- Picture 1
- Picture 2
- Slender cottonweed
- Slender sunflower
- Picture 1
- Picture 2
- Slender tarweed
- Picture 1
- Picture 2
- Picture 3
- Small primrose
- Picture 1
- Picture 2
- Picture 3
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- Small-leaved lomatium
- Small-leaved rose
- Picture 1 (Rare)
- Picture 2 (Rare)
- Picture 3
- Picture 4
- Picture 5
- Smilo grass
- Snakeroot
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Picture 5
- Sneezeweed
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Picture 5
- Picture 6
- Snowy thistle
- Picture 1
- Picture 2
- Soap lily
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Picture 5
- Picture 6
- Soap plant
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Picture 5
- Picture 6
- Soft chess
- Picture 1
- Picture 2
- Southern California milkvetch
- Southern sun cup
- Picture 1
- Picture 2
- Spanish broom
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Picture 5
- Spanish clover
- Picture 1
- Picture 2
- Spearscale
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Spider lupine
- Picture 1
- Picture 2
- Spike rush
- Picture 1
- Picture 2
- Picture 3
- Spiny rush
- Splendid mariposa lily
- Picture 1
- Picture 2
- Spotted spurge
- Picture 1
- Picture 2
- Squaw bush
- Picture 1
- Picture 2
- Picture 3
- Squirreltail
- St. Catherine's lace
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Picture 5
- Star thistle
- Star-lily
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Picture 5
- Stick-leaf
- Picture 1
- Picture 2
- Sticky phacelia
- Picture 1
- Picture 2
- Sticky potentilla
- Stinging lupine
- Stinging nettle
- Picture 1
- Picture 2
- Picture 3
- Stone-crop
- Stream orchid
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Picture 5
- Picture 6
- Sugar bush
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Picture 5
- Summer holly
- Picture 1
- Picture 2
- Picture 3
- Picture 4 (fruits)
- Sun cup
- Picture 1
- Picture 2
- Swamp knotweed
- Picture 1
- Picture 2
- Sweet acacia
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Sweet alyssum
- Picture 1
- Picture 2
- Picture 3
- Sweet fennel
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Picture 5
- Picture 6
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