- Salicornia virginica
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Salix exigua
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Salix laevigata
- Picture 1
- Picture 2
- Salix lasiolepis
- Picture 1 (male catkins)
- Picture 2 (female catkins)
- Picture 3 (female catkins)
- Picture 4 (male catkins)
- Salsola tragus
- Picture 1
- Picture 2
- Picture 3
- Salvia apiana
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Picture 5
- Picture 6
- Salvia brandegei (Rare)
- Salvia carduacea
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Picture 5
- Picture 6
- Picture 7
- Picture 8
- Picture 9
- Picture 10
- Salvia columbariae
- Salvia leucophylla
- Picture 1
- Picture 2
- Salvia mellifera
- Picture 1
- Picture 2 (leaves)
- Salvia spathacea
- Picture 1
- Picture 2
- Picture 3
- Sambucus mexicana
- Picture 1
- Picture 2
- Sanicula arctopoides
- Picture 1
- Picture 2
- Sanicula arguta
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Picture 5
- Sanicula bipinnatifida
- Sanicula crassicaulis
- Sarcostemma cynanchoides ssp. hartwegii
- Picture 1
- Picture 2
- Saxifraga californica
- Schismus arabicus
- Scirpus californicus
- Picture 1
- Picture 2
- Scirpus sp.
- Scrophularia californica
- Picture 1
- Picture 2
- Picture 3
- Scutellaria tuberosa
- Picture 1
- Picture 2
- Sedum spathulifolium
- Senecio breweri
- Senecio vulgaris
- Picture 1
- Picture 2
- Setaria viridis
- Sherardia arvensis
- Sidalcea malvaeflora ssp. malvaeflora
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Sidalcea malvaeflora ssp. sparsifolia
- Picture 1
- Picture 2
- Picture 3
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- Silene gallica
- Picture 1
- Picture 2
- Silene laciniata
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Picture 5
- Picture 6
- Picture 7
- Silybum marianum
- Picture 1
- Picture 2 (seeds)
- Picture 3
- Picture 4
- Picture 5 (leaves)
- Picture 6 (leaves)
- Picture 7
- Sisymbrium irio
- Picture 1
- Picture 2
- Sisyrinchium bellum
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Picture 5
- Solanum douglasii
- Picture 1
- Picture 2
- Solanum umbelliferum
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Solanum xanti
- Sonchus oleraceus
- Picture 1
- Picture 2
- Sorghum halepense
- Picture 1
- Picture 2
- Spartina foliosa
- Picture 1
- Picture 2
- Spartium junceum
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Picture 5
- Spergularia macrotheca
- Picture 1
- Picture 2
- Picture 3
- Sphaeralcea fulva
- Stachys albens
- Picture 1
- Picture 2
- Picture 3
- Stachys bullata
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Picture 5
- Picture 6
- Stanleya pinnata
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Picture 5
- Stellaria media
- Stephanomeria virgata
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Streptanthus glandulosus
- Picture 1
- Picture 2
- Picture 3
- Picture 4
- Picture 5
- Picture 6
- Stylocline gnaphalioides
- Picture 1
- Picture 2
- Stylomecon heterophylla
- Picture 1
- Picture 2
- Symphoricarpos mollis
- Picture 1
- Picture 2
- Picture 3
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