- Salal
- Picture 1
- Picture 2
- Salmonberry
- Saltgrass
- Picture 1
- Picture 2
- Picture 3
- San Luis mariposa lily
- Sand spurrey
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Sandwort
- Sargent cypress
- Scarlet monkey flower
- Picture 1
- Picture 2
- Picture 3
- Scarlet pimpernel
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Scrub oak
- Sea fig
- Picture 1
- Picture 2
- Seaside daisy
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Seaside woolly sunflower
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Self heal
- Picture 1
- Picture 2
- Sheep sorrel
- Picture 1
- Picture 2
- Shepherd's purse
- Shiny leaf barberry
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Shooting star
- Picture 1
- Picture 2
- Picture 3
- Short-spiked hedge nettle
- Silver puffs
- Silverweed
- Skullcap
- Picture 1
- Picture 2
- Skunkweed
- Picture 1
- Picture 2
- Sky lupine
- Picture 1
- Picture 2
- Slender cottonweed
- Picture 1
- Picture 2
- Slender tarweed
- Slim Solomon's seal
- Picture 1
- Picture 2
- Picture 3
- Picture 4
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- Small primrose
- Picture 1
- Picture 2
- Picture 3
- Snakeroot
- Snowdrop bush
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Picture 5
- Soap lily
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Picture 5
- Picture 6
- Picture 7
- Picture 8
- Picture 9
- Picture 10
- Picture 11
- Picture 12
- Soap plant
- Picture 1
- Picture 2
- Picture 3
- Soft chess
- Picture 1
- Picture 2
- Spanish broom
- Picture 1
- Picture 2
- Spanish clover
- Picture 1
- Picture 2
- Spicebush
- Picture 1
- Picture 2
- Spotted bur clover
- Spotted coralroot
- Picture 1
- Picture 2
- Star thistle
- Star-lily
- Picture 1
- Picture 2
- Sticky potentilla
- Stinging nettle
- Picture 1
- Picture 2
- Stone-crop
- Picture 1
- Picture 2
- Picture 3
- Stream orchid
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Sun cup
- Swamp knotweed
- Picture 1
- Picture 2
- Sweet alyssum
- Picture 1
- Picture 2
- Picture 3
- Sweet fennel
- Picture 1
- Picture 2
- Picture 3
- Sword fern
- Picture 1
- Picture 2
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