| ----------------------------------------------------------------------------------------- |
| TSN | ITIS Full Latin Name | Preferred Latin Name | ITIS Common Name(s) | Preferred Common Name(s) |
| ----------------------------------------------------------------------------------------- |
| 20024 | Sagina decumbens ssp. | western pearlwort |
| occidentalis |
| 504944 | Sairocarpus multiflorus | (Antirrhinum multiflorum) | sticky snapdragon | multiflora snapdragon |
| 504945 | Sairocarpus nuttallianus | (Antirrhinum nuttallianum ssp. | Nuttall's snapdragon | Nuttall's snapdragon |
| subsessile) |
| 20648 | Salicornia virginica | Virginia glasswort |
| 22508 | Salix bonplandiana | bonpland willow |
| red willow |
| 22529 | Salix exigua | sandbar willow |
| 507257 | Salix laevigata | red willow | willow |
| 22551 | Salix lasiolepis | arroyo willow |
| 524653 | Salix lucida ssp. lasiandra | yellow willow | Pacific willow |
| 32703 | Salvia brandegei | Salvia brandegeei | Brandegee's sage | Santa Rosa Island sage |
| 32707 | Salvia columbariae | chia |
| 32721 | Salvia leucophylla | purple sage |
| 32724 | Salvia mellifera | black sage |
| 525079 | Sambucus nigra ssp. | (Sambucus mexicana) | elderberry |
| canadensis |
| 524659 | Samolus valerandi ssp. | (Samolus parviflorus) | water pimpernel | seaside brookweed |
| parviflorus |
| 29847 | Sanicula arguta | sharptooth blacksnakeroot |
| 29854 | Sanicula hoffmannii | Hoffmann's blacksnakeroot |
| 32305 | Satureja douglasii | yerba buena |
| 24257 | Saxifraga californica | California saxifrage |
| 28811 | Schinus molle | peppertree |
| Peruvian peppertree |
| 42065 | Schismus arabicus | Mediterranean grass | Arabian schismus |
| 42066 | Schismus barbatus | common Mediterranean |
| grass |
| 508142 | Schoenoplectus californicus | (Scirpus californicus) | California bulrush |
| 508146 | Schoenoplectus pungens | (Scirpus pungens) | sharp bulrush |
| 20360 | Scleranthus annuus | German knotgrass |
| 524681 | Scrophularia californica ssp. | California figwort |
| californica |
| 32779 | Scutellaria tuberosa | skullcap | Danny's skullcap |
| 17073 | Selaginella bigelovii | bushy spike-moss | bushy spikemoss |
| 36097 | Senecio aphanactis | chaparral ragwort |
| 530312 | Senecio flaccidus var. | bush groundsel | Douglas' groundsel |
| douglasii |
| 36156 | Senecio mikanioides | capeivy |
| 36194 | Senecio vulgaris | common groundsel |
| 23304 | Sibara filifolia | Santa Cruz Island winged |
| rockcress |
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