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Key to families Table of families and genera
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Scientific Name

Index Page: S

Scientific NameCommon Name
Saccharum
Saccharum ravennaeRAVENNA GRASSNaturalized
Sagina
  ↳  Key to Sagina
PEARLWORT
Sagina apetalaDWARF PEARLWORTNaturalized
Sagina apetala var. barbata
(Under Sagina apetala)
Synonym
Sagina crassicaulis
(Under Sagina maxima subsp. crassicaulis)
Synonym
Sagina decumbens subsp. occidentalisWESTERN PEARLWORTNative
Sagina maxima subsp. crassicaulisTHICK-STEMMED PEARLWORTNative
Sagina occidentalis
(Under Sagina decumbens subsp. occidentalis)
Synonym
Sagina procumbensMATTED PEARLWORTNaturalized
Sagina saginoidesARCTIC PEARLWORTNative
Sagina saginoides var. hesperia
(Under Sagina saginoides)
Synonym
Sagina subulataSCOTTISH MOSSWaif
Sagittaria
  ↳  Key to Sagittaria
ARROWHEAD
Sagittaria brevirostra
(Under Sagittaria)
Mentioned in
a note
Sagittaria cuneataNative
Sagittaria latifoliaNative
Sagittaria longilobaNative
Sagittaria montevidensis subsp. calycinaNative
Sagittaria rigidaSESSILE-FRUITED ARROWHEADNaturalized
Sagittaria sanfordiiSANFORD'S ARROWHEADNative
Sairocarpus breweri
(Under Antirrhinum vexillocalyculatum subsp. breweri)
Synonym
Sairocarpus cornutus
(Under Antirrhinum cornutum)
Synonym
Sairocarpus coulterianus
(Under Antirrhinum coulterianum)
Synonym
Sairocarpus kingii
(Under Antirrhinum kingii)
Synonym
Sairocarpus multiflorus
(Under Antirrhinum multiflorum)
Synonym
Sairocarpus subcordatus
(Under Antirrhinum subcordatum)
Synonym
Sairocarpus virga
(Under Antirrhinum virga)
Synonym
Salazaria mexicana
(Under Scutellaria mexicana)
Synonym
Salicaceae
  ↳  Key to Salicaceae
WILLOW FAMILY
Salicornia
  ↳  Key to Salicornia
PICKLEWEED
Salicornia bigeloviiNative
Salicornia depressaNative
Salicornia europaea
(Under Salicornia depressa)
Synonym
Salicornia europaea
(Under Salicornia rubra)
Mentioned in
a note
Salicornia pacificaNative
Salicornia perennisNative
Salicornia rubraNative
Salicornia subterminalis
(Under Arthrocnemum subterminale)
Synonym
Salicornia subterminalis
(Under Salicornia)
Mentioned in
a note
Salicornia utahensis
(Under Salicornia pacifica)
Mentioned in
a note
Salicornia virginica
(Under Salicornia pacifica)
Synonym
Salicornia virginica
(Under Salicornia perennis)
Mentioned in
a note
Salix
  ↳  Key to Salix
WILLOW
Salix albaWHITE WILLOWNaturalized
Salix alba var. vitellina
(Under Salix alba)
Synonym
Salix arctica
(Under Salix petrophila)
Synonym
Salix arctica subsp. petraea
(Under Salix petrophila)
Synonym
Salix babylonicaWEEPING WILLOWNaturalized
Salix bebbianaBEBB'S WILLOWNative
Salix bonplandiana
(Under Salix)
Mentioned in
a note
Salix bonplandiana var. laevigata
(Under Salix laevigata)
Synonym
Salix boothiiBOOTH'S WILLOWNative
Salix brachycarpa subsp. brachycarpa
(Under Salix brachycarpa var. brachycarpa)
Synonym
Salix brachycarpa var. brachycarpaSHORT-FRUITED WILLOWNative
Salix breweriBREWER'S WILLOWNative
Salix cascadensis
(Under Salix petrophila)
Mentioned in
a note
Salix caudata var. bryantiana
(Under Salix lasiandra var. caudata)
Synonym
Salix commutata
(Under Salix)
Mentioned in
a note
Salix cordata var. mackenzieana
(Under Salix prolixa)
Synonym
Salix coulteri
(Under Salix sitchensis)
Synonym
Salix delnortensisDEL NORTE WILLOWNative
Salix drummondianaDRUMMOND'S WILLOWNative
Salix drummondiana var. subcoerulea
(Under Salix drummondiana)
Synonym
Salix eastwoodiaeSIERRA WILLOWNative
Salix eriocephala subsp. mackenzieana
(Under Salix prolixa)
Synonym
Salix eriocephala var. ligulifolia
(Under Salix ligulifolia)
Synonym
Salix eriocephala var. watsonii
(Under Salix lutea)
Synonym
Salix euxina
(Under Salix alba)
Mentioned in
a note
Salix exigua
  ↳  Key to Salix exigua
Native
Salix exigua subsp. melanopsis
(Under Salix melanopsis)
Synonym
Salix exigua var. exiguaNARROW-LEAVED WILLOW, COYOTE WILLOWNative
Salix exigua var. hindsianaHINDS' WILLOWNative
Salix exigua var. nevadensis
(Under Salix exigua var. exigua)
Synonym
Salix exigua var. stenophylla
(Under Salix exigua var. exigua)
Synonym
Salix fragilis
(Under Salix alba)
Mentioned in
a note
Salix geyerianaGEYER'S WILLOWNative
Salix geyeriana var. argentea
(Under Salix geyeriana)
Synonym
Salix gooddingiiGOODDING'S BLACK WILLOWNative
Salix gooddingii var. variabilis
(Under Salix gooddingii)
Synonym
Salix hindsiana
(Under Salix exigua var. hindsiana)
Synonym
Salix hindsiana var. leucodendroides
(Under Salix exigua var. hindsiana)
Synonym
Salix hindsiana var. parishiana
(Under Salix exigua var. hindsiana)
Synonym
Salix hookerianaCOASTAL WILLOWNative
Salix jepsoniiJEPSON'S WILLOWNative
Salix laevigataRED WILLOWNative
Salix laevigata f. araquipa
(Under Salix laevigata)
Synonym
Salix laevigata var. congesta
(Under Salix laevigata)
Synonym
Salix lasiandra
  ↳  Key to Salix lasiandra
Native
Salix lasiandra var. abramsii
(Under Salix lasiandra var. lasiandra)
Synonym
Salix lasiandra var. caudataTAIL-LEAF WILLOWNative
Salix lasiandra var. lancifolia
(Under Salix lasiandra var. lasiandra)
Synonym
Salix lasiandra var. lasiandraPACIFIC WILLOWNative
Salix lasiandra var. macrophylla
(Under Salix lasiandra var. lasiandra)
Synonym
Salix lasiolepisARROYO WILLOWNative
Salix lasiolepis var. bigelovii
(Under Salix lasiolepis)
Synonym
Salix lasiolepis var. bracelinae
(Under Salix lasiolepis)
Synonym
Salix lasiolepis var. lasiolepis
(Under Salix lasiolepis)
Synonym
Salix lasiolepis var. sandbergii
(Under Salix lasiolepis)
Synonym
Salix lemmoniiLEMMON'S WILLOWNative
Salix ligulifoliaSTRAP-LEAFED WILLOWNative
Salix lucida subsp. caudata
(Under Salix lasiandra var. caudata)
Synonym
Salix lucida subsp. lasiandra
(Under Salix lasiandra var. lasiandra)
Synonym
Salix luteaYELLOW WILLOWNative
Salix lutea var. nivaria
(Under Salix lasiolepis)
Synonym
Salix lutea var. watsonii
(Under Salix lutea)
Synonym
Salix mackenzieana
(Under Salix prolixa)
Synonym
Salix macrostachya var. leucodendroides
(Under Salix exigua var. hindsiana)
Synonym
Salix melanopsisDUSKY WILLOWNative
Salix melanopsis var. bolanderiana
(Under Salix melanopsis)
Synonym
Salix melanopsis var. gracilipes
(Under Salix melanopsis)
Synonym
Salix myrtillifolia
(Under Salix boothii)
Synonym
Salix nivalisSNOW WILLOWNative
Salix oresteraGRAY-LEAFED SIERRA WILLOWNative
Salix parksiana
(Under Salix melanopsis)
Synonym
Salix petrophilaROCKY MOUNTAIN WILLOWNative
Salix phylicifolia var. monica
(Under Salix planifolia)
Synonym
Salix piperi
(Under Salix hookeriana)
Synonym
Salix planifoliaTEA-LEAFED WILLOWNative
Salix planifolia subsp. planifolia
(Under Salix planifolia)
Synonym
Salix prolixaMACKENZIE'S WILLOWNative
Salix pseudocordata
(Under Salix boothii)
Synonym
Salix purpureaBASKET WILLOWNaturalized
Salix reticulata subsp. nivalis
(Under Salix nivalis)
Synonym
Salix scoulerianaSCOULER'S WILLOWNative
Salix scouleriana var. coetanea
(Under Salix scouleriana)
Synonym
Salix sessilifolia
(Under Salix)
Mentioned in
a note
Salix sessilifolia
(Under Salix exigua var. exigua)
Mentioned in
a note
Salix sitchensisSITKA WILLOWNative
Salix sitchensis var. angustifolia
(Under Salix jepsonii)
Synonym
Salix sitchensis var. ralphiana
(Under Salix jepsonii)
Synonym
Salix tracyiTRACY'S WILLOWNative
Salpichroa
Salpichroa origanifoliaNaturalized
Salpichroa rhomboidea
(Under Salpichroa origanifolia)
Synonym
Salsola
  ↳  Key to Salsola
Salsola atriplicifolia
(Under Cycloloma atriplicifolium)
Synonym
Salsola australisNaturalized
Salsola damascenaNaturalized
Salsola gobicolaNaturalized
Salsola iberica
(Under Salsola tragus)
Synonym
Salsola kali subsp. pontica
(Under Salsola australis)
Synonym
Salsola kali var. tenuifolia
(Under Salsola australis)
Synonym
Salsola kali var. tenuifolia
(Under Salsola tragus)
Synonym
Salsola paulseniiBARBWIRE RUSSIAN THISTLENaturalized
Salsola paulsenii
(Under Salsola gobicola)
Synonym
Salsola pestifer
(Under Salsola tragus)
Synonym
Salsola ryaniiNaturalized
Salsola sodaNaturalized
Salsola tragusRUSSIAN THISTLE, TUMBLEWEEDNaturalized
Salsola tragus
(Under Salsola australis)
Synonym
Salsola tragus
(Under Salsola gobicola)
Synonym
Salsola vermiculata
(Under Salsola damascena)
Synonym
Saltugilia
  ↳  Key to Saltugilia
Saltugilia australisNative
Saltugilia caruifoliaCARAWAY-LEAVED WOODLAND-GILIANative
Saltugilia grinnellii
(Under Saltugilia splendens)
Synonym
Saltugilia latimeriLATIMER'S WOODLAND-GILIANative
Saltugilia splendensSPLENDID WOODLAND-GILIANative
Saltugilia splendens subsp. grantiiNative
Saltugilia splendens subsp. splendensNative
Salvia
  ↳  Key to Salvia
Salvia aethiopisMEDITERRANEAN SAGENaturalized
Salvia apianaWHITE SAGENative
Salvia apiana var. compacta
(Under Salvia apiana)
Mentioned in
a note
Salvia brandegeeiBRANDEGEE'S SAGENative
Salvia brandegei
(Under Salvia brandegeei)
Synonym
Salvia carduaceaTHISTLE SAGENative
Salvia carnosa subsp. gilmanii
(Under Salvia dorrii var. dorrii)
Synonym
Salvia clevelandiiNative
Salvia columbariaeCHIANative
Salvia columbariae var. ziegleri
(Under Salvia columbariae)
Synonym
Salvia dorriiNative
Salvia dorrii subsp. argentea
(Under Salvia dorrii var. dorrii)
Synonym
Salvia dorrii subsp. carnosa
(Under Salvia dorrii var. incana)
Synonym
Salvia dorrii subsp. gilmanii
(Under Salvia dorrii var. dorrii)
Synonym
Salvia dorrii var. carnosa
(Under Salvia dorrii var. incana)
Synonym
Salvia dorrii var. dorriiNative
Salvia dorrii var. incanaFLESHY SAGENative
Salvia dorrii var. pilosaNative
Salvia eremostachyaDESERT SAGENative
Salvia funereaDEATH VALLEY SAGENative
Salvia funerea var. fornacis
(Under Salvia funerea)
Synonym
Salvia greataeOROCOPIA SAGENative
Salvia leucophyllaPURPLE SAGENative
Salvia melliferaBLACK SAGENative
Salvia microphylla
(Under Salvia)
Mentioned in
a note
Salvia mohavensisNative
Salvia munziiMUNZ'S SAGENative
Salvia pachyphyllaNative
Salvia pratensis
(Under Salvia virgata)
Mentioned in
a note
Salvia sonomensisNative
Salvia spathaceaCALIFORNIA HUMMINGBIRD SAGENative
Salvia vaseyiNative
Salvia verbenacea
(Under Salvia)
Mentioned in
a note
Salvia virgataMEADOW SAGENaturalized
Salvinia
  ↳  Key to Salvinia
Salvinia minimaNaturalized
Salvinia molestaNaturalized
Salvinia oblongifoliaWaif
SalviniaceaeFLOATING-FERN or WATER-SPANGLE FAMILY
Sambucus
  ↳  Key to Sambucus
ELDERBERRY
Sambucus caerulea
(Under Sambucus nigra subsp. caerulea)
Synonym
Sambucus melanocarpa
(Under Sambucus racemosa var. melanocarpa)
Synonym
Sambucus mexicana
(Under Sambucus nigra subsp. caerulea)
Synonym
Sambucus microbotrys
(Under Sambucus racemosa var. racemosa)
Synonym
Sambucus nigra
(Under Orobanche vallicola)
Mentioned in
a note
Sambucus nigra subsp. caeruleaBLUE ELDERBERRYNative
Sambucus racemosaNative
Sambucus racemosa var. melanocarpaBLACK ELDERBERRYNative
Sambucus racemosa var. microbotrys
(Under Sambucus racemosa var. racemosa)
Synonym
Sambucus racemosa var. racemosaRED ELDERBERRYNative
Samolus
Samolus ebracteatus
(Under Samolus parviflorus)
Mentioned in
a note
Samolus floribundus
(Under Samolus parviflorus)
Synonym
Samolus parviflorusSEASIDE BROOKWEEDNative
Samolus valerandi subsp. parviflorus
(Under Samolus parviflorus)
Synonym
Sanguisorba
Sanguisorba annua
(Under Poteridium annuum)
Synonym
Sanguisorba minor
(Under Poterium sanguisorba)
Synonym
Sanguisorba minor subsp. muricata
(Under Poterium sanguisorba)
Synonym
Sanguisorba muricata
(Under Sanguisorba officinalis)
Synonym
Sanguisorba officinalisGREAT BURNETNative
Sanguisorba officinalis subsp. microcephala
(Under Sanguisorba officinalis)
Mentioned in
a note
Sanicula
  ↳  Key to Sanicula
Sanicula arctopoidesFOOTSTEPS OF SPRING, YELLOW MATSNative
Sanicula argutaNative
Sanicula bipinnataPOISON SANICLENative
Sanicula bipinnatifidaPURPLE SANICLE, SHOE BUTTONSNative
Sanicula crassicaulisNative
Sanicula graveolensNative
Sanicula hoffmanniiHOFFMANN'S SANICLENative
Sanicula laciniataNative
Sanicula maritimaADOBE SANICLENative
Sanicula peckianaPECK'S SANICLENative
Sanicula saxatilisROCK SANICLENative
Sanicula simulans
(Under Sanicula arguta)
Synonym
Sanicula tracyiTRACY'S SANICLENative
Sanicula tuberosaNative
Santolina
Santolina chamaecyparissusLAVENDER-COTTONWaif
Santolina chamaecyparisus
(Under Asteraceae (Compositae))
Mentioned in
a note
Santolina suaveolens
(Under Matricaria discoidea)
Synonym
Sanvitalia
Sanvitalia abertiiABERT'S SANVITALIANative
Sanvitalia procumbens
(Under Sanvitalia)
Mentioned in
a note
Sapindaceae
  ↳  Key to Sapindaceae
SOAPBERRY FAMILY
Sapium sebiferum
(Under Triadica sebifera)
Synonym
SaponariaSOAPWORT
Saponaria hispanica
(Under Vaccaria hispanica)
Synonym
Saponaria ocymoides
(Under Saponaria)
Mentioned in
a note
Saponaria officinalisNaturalized
Saponaria vaccaria
(Under Vaccaria hispanica)
Synonym
SarcobataceaeSARCOBATUS or GREASEWOOD FAMILY
Sarcobatus
  ↳  Key to Sarcobatus
GREASEWOOD
Sarcobatus baileyiNative
Sarcobatus maximilianii
(Under Sarcobatus vermiculatus)
Synonym
Sarcobatus vermiculatusNative
Sarcobatus vermiculatus var. baileyi
(Under Sarcobatus baileyi)
Synonym
Sarcocornia pacifica
(Under Salicornia pacifica)
Synonym
Sarcocornia perennis
(Under Salicornia perennis)
Synonym
SarcodesSNOW PLANT
Sarcodes sanguineaNative
Sarcostemma crispum
(Under Funastrum crispum)
Synonym
Sarcostemma cynanchoides subsp. hartwegii
(Under Funastrum cynanchoides var. hartwegii)
Synonym
Sarcostemma hirtellum
(Under Funastrum hirtellum)
Synonym
SarraceniaPITCHER-PLANT
Sarracenia purpureaNaturalized
Sarracenia purpurea subsp. purpurea
(Under Sarracenia purpurea)
Mentioned in
a note
Sarracenia purpurea subsp. venosa
(Under Sarracenia purpurea)
Mentioned in
a note
Sarraceniaceae
  ↳  Key to Sarraceniaceae
PITCHER-PLANT FAMILY
Satureja calamintha subsp. ascendens
(Under Lamiaceae (Labiatae))
Mentioned in
a note
Satureja chandleri
(Under Clinopodium chandleri)
Synonym
Satureja douglasii
(Under Clinopodium douglasii)
Synonym
Satureja mimuloides
(Under Clinopodium mimuloides)
Synonym
SaururaceaeLIZARD'S-TAIL FAMILY
Saussurea
Saussurea americanaAMERICAN SAW-WORTNative
Savastana hirta
(Under Anthoxanthum nitens subsp. nitens)
Synonym
Saviniona assurgentiflora
(Under Malva assurgentiflora)
Synonym
Saviniona clementina
(Under Malva assurgentiflora)
Synonym
Saviniona reticulata
(Under Malva assurgentiflora)
Synonym
Saxifraga
  ↳  Key to Saxifraga
SAXIFRAGE
Saxifraga aprica
(Under Micranthes aprica)
Synonym
Saxifraga bryophora
(Under Micranthes bryophora)
Synonym
Saxifraga bryophora var. bryophora
(Under Micranthes bryophora)
Synonym
Saxifraga californica
(Under Micranthes californica)
Synonym
Saxifraga cespitosaTUFTED SAXIFRAGENative
Saxifraga cespitosa var. emarginata
(Under Saxifraga cespitosa)
Synonym
Saxifraga ferruginea
(Under Micranthes ferruginea)
Synonym
Saxifraga ferruginea var. ferruginea
(Under Micranthes ferruginea)
Synonym
Saxifraga fragarioides
(Under Saxifragopsis fragarioides)
Synonym
Saxifraga howellii
(Under Micranthes howellii)
Synonym
Saxifraga hyperboreaNative
Saxifraga integrifolia
(Under Micranthes integrifolia)
Synonym
Saxifraga marshallii
(Under Micranthes marshallii)
Synonym
Saxifraga mertensianaNative
Saxifraga nidifica var. claytoniifolia
(Under Micranthes fragosa)
Synonym
Saxifraga nidifica var. nidifica
(Under Micranthes nidifica)
Synonym
Saxifraga nuttallii
(Under Cascadia nuttallii)
Synonym
Saxifraga odontoloma
(Under Micranthes odontoloma)
Synonym
Saxifraga oregana
(Under Micranthes oregana)
Synonym
Saxifraga peltata
(Under Darmera peltata)
Synonym
Saxifraga rivularis
(Under Saxifraga hyperborea)
Synonym
Saxifraga rufidula
(Under Micranthes marshallii)
Mentioned in
a note
Saxifraga stolonifera
(Under Saxifraga)
Mentioned in
a note
Saxifraga tolmiei
(Under Micranthes tolmiei)
Synonym
Saxifragaceae
  ↳  Key to Saxifragaceae
SAXIFRAGE FAMILY
Saxifragopsis
Saxifragopsis fragarioidesNative
Scabiosa
  ↳  Key to Scabiosa
PINCUSHION FLOWER
Scabiosa atropurpureaNaturalized
Scabiosa stellataWaif
Scandix
Scandix pecten-venerisVENUS' NEEDLENaturalized
SceptridiumGRAPE-FERN
Sceptridium multifidumLEATHER GRAPE-FERNNative
Schedonnardus paniculatus
(Under Poaceae (Gramineae))
Mentioned in
a note
Schedonorus arundinaceus
(Under Festuca arundinacea)
Synonym
Schedonorus phoenix
(Under Festuca arundinacea)
Synonym
Schedonorus pratensis
(Under Festuca pratensis)
Synonym
Scheuchzeria
Scheuchzeria palustrisSCHEUCHZERIANative
Scheuchzeria palustris subsp. americana
(Under Scheuchzeria palustris)
Synonym
Scheuchzeria palustris var. americana
(Under Scheuchzeria palustris)
Synonym
ScheuchzeriaceaeSCHEUCHZERIA FAMILY
Schinus
  ↳  Key to Schinus
Schinus mollePEPPER TREENaturalized
Schinus polygamusCHILEAN PEPPER TREENaturalized
Schinus terebinthifoliusBRAZILIAN PEPPER TREENaturalized
Schinus terebinthifolius var. raddianus
(Under Schinus terebinthifolius)
Synonym
Schismus
  ↳  Key to Schismus
MEDITERRANEAN GRASS
Schismus arabicusNaturalized
Schismus barbatusNaturalized
Schizachyrium cirratum
(Under Poaceae (Gramineae))
Mentioned in
a note
Schizachyrium scoparium
(Under Poaceae (Gramineae))
Mentioned in
a note
Schizococcus myrtifolius
(Under Arctostaphylos myrtifolia)
Synonym
Schizococcus nissenanus
(Under Arctostaphylos nissenana)
Synonym
Schkuhria multiflora
(Under Picradeniopsis multiflora)
Synonym
Schkuhria multiflora
(Under Asteraceae (Compositae))
Mentioned in
a note
Schkuhria multiflora var. multiflora
(Under Picradeniopsis multiflora)
Synonym
Schmaltzia trilobata
(Under Rhus aromatica)
Synonym
Schoenolirion album
(Under Hastingsia alba)
Synonym
Schoenoplectus
  ↳  Key to Schoenoplectus
NAKED-STEMMED BULRUSHES
Schoenoplectus acutus var. acutus
(Under Schoenoplectus acutus var. occidentalis)
Mentioned in
a note
Schoenoplectus acutus var. occidentalisCOMMON TULENative
Schoenoplectus americanusOLNEY'S THREE-SQUARE BULRUSHNative
Schoenoplectus californicusSOUTHERN BULRUSHNative
Schoenoplectus fluviatilis
(Under Bolboschoenus fluviatilis)
Synonym
Schoenoplectus glaucus
(Under Bolboschoenus glaucus)
Synonym
Schoenoplectus heterochaetusSLENDER BULRUSHNative
Schoenoplectus mucronatusROUGH-SEED BULRUSH, RICE-FIELD BULRUSHNaturalized
Schoenoplectus pungens
(Under Amphiscirpus nevadensis)
Mentioned in
a note
Schoenoplectus pungens
(Under Schoenoplectus americanus)
Mentioned in
a note
Schoenoplectus pungens var. badius
(Under Schoenoplectus pungens var. longispicatus)
Synonym
Schoenoplectus pungens var. longispicatusCOMMON THREE-SQUARE BULRUSHNative
Schoenoplectus pungens var. pungens
(Under Schoenoplectus pungens var. longispicatus)
Mentioned in
a note
Schoenoplectus robustus
(Under Bolboschoenus robustus)
Synonym
Schoenoplectus saximontanusROCKY MOUNTAIN BULRUSHNative
Schoenoplectus subterminalisWATER BULRUSHNative
Schoenoplectus tabernaemontaniSOFT-STEM BULRUSHNative
Schoenoplectus triqueterTHREE-SIDED BULRUSHHistorical waif
Schoenus
Schoenus nigricansBLACK BOG-RUSHNative
Scirpus
  ↳  Key to Scirpus
BULRUSH
Scirpus acutus var. occidentalis
(Under Schoenoplectus acutus var. occidentalis)
Synonym
Scirpus albomarginatus
(Under Eleocharis quadrangulata)
Synonym
Scirpus alpinus
(Under Trichophorum pumilum)
Synonym
Scirpus americanus
(Under Schoenoplectus americanus)
Synonym
Scirpus americanus var. longispicatus
(Under Schoenoplectus pungens var. longispicatus)
Synonym
Scirpus atropurpureus
(Under Eleocharis atropurpurea)
Synonym
Scirpus autumnalis
(Under Fimbristylis autumnalis)
Synonym
Scirpus bernardinus
(Under Eleocharis bernardina)
Synonym
Scirpus californicus
(Under Schoenoplectus californicus)
Synonym
Scirpus campestris
(Under Bolboschoenus maritimus subsp. paludosus)
Synonym
Scirpus capillaris
(Under Bulbostylis capillaris)
Synonym
Scirpus carinatus
(Under Isolepis carinata)
Synonym
Scirpus cernuus
(Under Isolepis cernua)
Synonym
Scirpus cernuus subsp. californicus
(Under Isolepis cernua)
Synonym
Scirpus cernuus var. californicus
(Under Isolepis cernua)
Synonym
Scirpus clementis
(Under Trichophorum clementis)
Synonym
Scirpus coloradoensis
(Under Eleocharis coloradoensis)
Synonym
Scirpus congdoniiNative
Scirpus cyperinusNaturalized
Scirpus diffususNative
Scirpus emergens
(Under Trichophorum pumilum)
Synonym
Scirpus fluviatilis
(Under Bolboschoenus fluviatilis)
Synonym
Scirpus geniculatus
(Under Eleocharis geniculata)
Synonym
Scirpus glaucus
(Under Bolboschoenus glaucus)
Synonym
Scirpus heterochaetus
(Under Schoenoplectus heterochaetus)
Synonym
Scirpus koilolepis
(Under Isolepis carinata)
Synonym
Scirpus lacustris var. tenuiculmis
(Under Schoenoplectus heterochaetus)
Synonym
Scirpus marginatus
(Under Eleocharis quadrangulata)
Synonym
Scirpus maritimus
(Under Bolboschoenus maritimus subsp. paludosus)
Synonym
Scirpus maritimus var. fluviatilis
(Under Bolboschoenus fluviatilis)
Synonym
Scirpus maritimus var. paludosus
(Under Bolboschoenus maritimus subsp. paludosus)
Synonym
Scirpus microcarpusNative
Scirpus microcarpus var. rubrotinctus
(Under Scirpus microcarpus)
Synonym
Scirpus mucronatus
(Under Schoenoplectus mucronatus)
Synonym
Scirpus nanus
(Under Eleocharis parvula)
Synonym
Scirpus nevadensis
(Under Amphiscirpus nevadensis)
Synonym
Scirpus obtusus
(Under Eleocharis obtusa)
Synonym
Scirpus olneyi
(Under Schoenoplectus americanus)
Synonym
Scirpus ovatus
(Under Eleocharis ovata)
Synonym
Scirpus pacificus
(Under Bolboschoenus maritimus subsp. paludosus)
Synonym
Scirpus paludosus
(Under Bolboschoenus maritimus subsp. paludosus)
Synonym
Scirpus palustris
(Under Eleocharis palustris)
Synonym
Scirpus parvulus
(Under Eleocharis parvula)
Synonym
Scirpus pauciflorus
(Under Eleocharis quinqueflora)
Synonym
Scirpus pendulusPENDULOUS BULRUSHNative
Scirpus pumilus
(Under Trichophorum pumilum)
Synonym
Scirpus pumilus subsp. rollandii
(Under Trichophorum pumilum)
Synonym
Scirpus pumilus var. rollandii
(Under Trichophorum pumilum)
Synonym
Scirpus pungens
(Under Schoenoplectus pungens var. longispicatus)
Synonym
Scirpus quadrangulatus
(Under Eleocharis quadrangulata)
Synonym
Scirpus quinqueflorus
(Under Eleocharis quinqueflora)
Synonym
Scirpus radicans
(Under Eleocharis radicans)
Synonym
Scirpus robustus
(Under Bolboschoenus robustus)
Synonym
Scirpus rollandii
(Under Trichophorum pumilum)
Synonym
Scirpus rostellatus
(Under Eleocharis rostellata)
Synonym
Scirpus rubrotinctus
(Under Scirpus microcarpus)
Synonym
Scirpus saximontanus
(Under Schoenoplectus saximontanus)
Synonym
Scirpus setaceus
(Under Isolepis setacea)
Synonym
Scirpus subterminalis
(Under Schoenoplectus subterminalis)
Synonym
Scirpus tabernaemontani
(Under Schoenoplectus tabernaemontani)
Synonym
Scirpus tenuis
(Under Eleocharis tenuis var. tenuis)
Synonym
Scirpus triqueter
(Under Schoenoplectus triqueter)
Synonym
Scirpus tuberosus
(Under Bolboschoenus glaucus)
Synonym
Scirpus vahlii
(Under Fimbristylis vahlii)
Synonym
Scirpus yosemitanus
(Under Trichophorum clementis)
Synonym
ScleranthusKNAWEL
Scleranthus annuus subsp. annuusNaturalized
Sclerocactus
  ↳  Key to Sclerocactus
PINEAPPLE CACTUS
Sclerocactus johnsoniiJOHNSON'S BEE-HIVE CACTUSNative
Sclerocactus polyancistrusMOJAVE FISHHOOK CACTUSNative
Sclerochloa
Sclerochloa duraHARDGRASS, FAIRGROUND GRASSNaturalized
Sclerolinon
Sclerolinon digynumNative
Scleropoa rigida
(Under Desmazeria rigida)
Synonym
Scleropogon
Scleropogon brevifoliusBURRO GRASSNative
Scoliopus
Scoliopus bigeloviiNative
ScolymusGOLDENTHISTLE
Scolymus hispanicusNaturalized
Scopulophila
Scopulophila rixfordiiRIXFORD ROCKWORTNative
Scorzonera
Scorzonera hispanicaSPANISH SALSIFY, VIPER'S GRASSNaturalized
ScribneriaSCRIBNER GRASS
Scribneria bolanderiNative
Scrophularia
  ↳  Key to Scrophularia
FIGWORT
Scrophularia atrataBLACK-FLOWERED FIGWORTNative
Scrophularia californicaCALIFORNIA FIGWORTNative
Scrophularia californica subsp. californica
(Under Scrophularia californica)
Synonym
Scrophularia californica subsp. floribunda
(Under Scrophularia californica)
Synonym
Scrophularia californica var. floribunda
(Under Scrophularia californica)
Synonym
Scrophularia desertorumNative
Scrophularia lanceolataNative
Scrophularia oregana
(Under Scrophularia californica)
Mentioned in
a note
Scrophularia peregrinaNaturalized
Scrophularia villosaSANTA CATALINA FIGWORTNative
Scrophulariaceae
  ↳  Key to Scrophulariaceae
FIGWORT FAMILY
Scutellaria
  ↳  Key to Scutellaria
SKULLCAP
Scutellaria angustifolia var. canescens
(Under Scutellaria siphocampyloides)
Synonym
Scutellaria antirrhinoidesNative
Scutellaria austiniae
(Under Scutellaria siphocampyloides)
Synonym
Scutellaria bolanderiNative
Scutellaria bolanderi subsp. austromontanaSOUTHERN MOUNTAINS SKULLCAPNative
Scutellaria bolanderi subsp. bolanderiNative
Scutellaria californicaNative
Scutellaria galericulataMARSH SKULLCAPNative
Scutellaria holmgreniorum
(Under Scutellaria nana)
Synonym
Scutellaria laterifloraSIDE-FLOWERING SKULLCAPNative
Scutellaria linearifolia
(Under Scutellaria siphocampyloides)
Synonym
Scutellaria mexicanaBLADDER-SAGENative
Scutellaria nanaNative
Scutellaria pilosiuscula
(Under Scutellaria tuberosa)
Synonym
Scutellaria sanhedrinsis
(Under Scutellaria antirrhinoides)
Synonym
Scutellaria siphocampyloidesNative
Scutellaria tuberosaNative
Scutellaria tuberosa subsp. similis
(Under Scutellaria tuberosa)
Synonym
Scutellaria viarum
(Under Scutellaria antirrhinoides)
Synonym
Searsia
Searsia lanceaAFRICAN SUMACNaturalized
SecaleRYE
Secale cerealeNaturalized
Securigera varia
(Under Coronilla varia)
Synonym
Sedella
  ↳  Key to Sedella
Sedella congdonii
(Under Sedella pumila)
Synonym
Sedella leiocarpaLAKE COUNTY STONECROPNative
Sedella pentandraNative
Sedella pumilaNative
Sedum
  ↳  Key to Sedum
STONECROP
Sedum albomarginatumFEATHER RIVER STONECROPNative
Sedum albumWHITE STONECROPNaturalized
Sedum congdonii
(Under Sedella pumila)
Synonym
Sedum dendroideum subsp. praealtum
(Under Sedum praealtum)
Synonym
Sedum divergensCASCADE STONECROPNative
Sedum eastwoodiae
(Under Sedum laxum subsp. eastwoodiae)
Synonym
Sedum lanceolatumSPEARLEAF STONECROPNative
Sedum lanceolatum subsp. lanceolatum
(Under Sedum lanceolatum)
Synonym
Sedum lanceolatum var. subalpinum
(Under Sedum lanceolatum)
Synonym
Sedum laxumNative
Sedum laxum subsp. eastwoodiaeRED MOUNTAIN STONECROPNative
Sedum laxum subsp. flavidumPALE-YELLOW STONECROPNative
Sedum laxum subsp. heckneriHECKNER'S STONECROPNative
Sedum laxum subsp. latifolium
(Under Sedum laxum subsp. laxum)
Synonym
Sedum laxum subsp. laxumROSEFLOWER STONECROPNative
Sedum laxum subsp. perplexum
(Under Sedum laxum subsp. laxum)
Synonym
Sedum laxum subsp. retusum
(Under Sedum obtusatum subsp. retusum)
Synonym
Sedum laxum var. eastwoodiae
(Under Sedum laxum subsp. eastwoodiae)
Synonym
Sedum laxum var. flavidum
(Under Sedum laxum subsp. flavidum)
Synonym
Sedum laxum var. heckneri
(Under Sedum laxum subsp. heckneri)
Synonym
Sedum laxum var. latifolium
(Under Sedum laxum subsp. laxum)
Synonym
Sedum laxum var. laxum
(Under Sedum laxum subsp. laxum)
Synonym
Sedum niveumDAVIDSON'S STONECROPNative
Sedum oblanceolatumAPPLEGATE STONECROPNative
Sedum obtusatumSIERRA STONECROPNative
Sedum obtusatum subsp. borealeNative
Sedum obtusatum subsp. obtusatumNative
Sedum obtusatum subsp. paradisumCANYON CREEK STONECROPNative
Sedum obtusatum subsp. retusumNative
Sedum obtusatum var. boreale
(Under Sedum obtusatum subsp. boreale)
Synonym
Sedum obtusatum var. hallii
(Under Sedum obtusatum subsp. obtusatum)
Synonym
Sedum obtusatum var. obtusatum
(Under Sedum obtusatum subsp. obtusatum)
Synonym
Sedum obtusatum var. paradisum
(Under Sedum obtusatum subsp. paradisum)
Synonym
Sedum obtusatum var. retusum
(Under Sedum obtusatum subsp. retusum)
Synonym
Sedum oreganumOREGON STONECROPNative
Sedum oregonenseCREAM STONECROPNative
Sedum paradisum
(Under Sedum obtusatum subsp. paradisum)
Synonym
Sedum pinetorum
(Under Sedum niveum)
Synonym
Sedum praealtumGREEN COCKSCOMBNaturalized
Sedum purdyi
(Under Sedum spathulifolium)
Synonym
Sedum radiatumCOAST RANGE STONECROPNative
Sedum radiatum subsp. depauperatum
(Under Sedum radiatum)
Synonym
Sedum radiatum subsp. radiatum
(Under Sedum radiatum)
Synonym
Sedum radiatum var. depauperatum
(Under Sedum radiatum)
Synonym
Sedum rosea subsp. integrifolium
(Under Rhodiola integrifolia subsp. integrifolia)
Synonym
Sedum roseum
(Under Sedum)
Mentioned in
a note
Sedum roseum subsp. integrifolium
(Under Rhodiola integrifolia subsp. integrifolia)
Synonym
Sedum sanhedrinum
(Under Sedum obtusatum subsp. retusum)
Synonym
Sedum spathulifoliumBROADLEAF STONECROPNative
Sedum spathulifolium subsp. anomalum
(Under Sedum spathulifolium)
Synonym
Sedum spathulifolium subsp. pruinosum
(Under Sedum spathulifolium)
Synonym
Sedum spathulifolium subsp. purdyi
(Under Sedum spathulifolium)
Synonym
Sedum spathulifolium subsp. spathulifolium
(Under Sedum spathulifolium)
Synonym
Sedum spathulifolium var. pruinosum
(Under Sedum spathulifolium)
Synonym
Sedum stenopetalumNative
Sedum stenopetalum subsp. monanthum
(Under Sedum stenopetalum)
Synonym
Sedum stenopetalum subsp. radiatum
(Under Sedum radiatum)
Synonym
Sedum stenopetalum var. monanthum
(Under Sedum stenopetalum)
Synonym
Selaginella
  ↳  Key to Selaginella
SPIKE-MOSS
Selaginella asprellaBLUISH SPIKE-MOSSNative
Selaginella bigeloviiNative
Selaginella cinerascensASHY SPIKE-MOSSNative
Selaginella densa var. scopulorum
(Under Selaginella scopulorum)
Synonym
Selaginella eremophilaDESERT SPIKE-MOSSNative
Selaginella hanseniiNative
Selaginella kraussiana
(Under Selaginella)
Mentioned in
a note
Selaginella lepidophylla
(Under Selaginella)
Mentioned in
a note
Selaginella leucobryoidesMOJAVE SPIKE-MOSSNative
Selaginella oreganaNative
Selaginella scopulorumROCKY MOUNTAIN SPIKE-MOSSNative
Selaginella wallaceiNative
Selaginella watsoniiNative
SelaginellaceaeSPIKE-MOSS FAMILY
Selinocarpus diffusus subsp. nevadensis
(Under Acleisanthes nevadensis)
Synonym
Selinocarpus nevadensis
(Under Acleisanthes nevadensis)
Synonym
Senecio
  ↳  Key to Senecio
RAGWORT, GROUNDSEL, BUTTERWEED
Senecio aphanactisCHAPARRAL RAGWORTNative
Senecio aronicoidesRAYLESS RAGWORTNative
Senecio astephanusSAN GABRIEL RAGWORTNative
Senecio bernardinus
(Under Packera bernardina)
Synonym
Senecio blochmaniaeBLOCHMAN'S RAGWORTNative
Senecio bolanderi
(Under Packera bolanderi var. bolanderi)
Synonym
Senecio bolanderi var. bolanderi
(Under Packera bolanderi var. bolanderi)
Synonym
Senecio breweri
(Under Packera breweri)
Synonym
Senecio californicusCALIFORNIA RAGWORTNative
Senecio canus
(Under Packera cana)
Synonym
Senecio clarkianusCLARK'S RAGWORTNative
Senecio clevelandii
(Under Packera clevelandii)
Synonym
Senecio covillei
(Under Senecio scorzonella)
Synonym
Senecio cymbalarioides
(Under Packera subnuda var. subnuda)
Synonym
Senecio douglasii
(Under Senecio flaccidus var. douglasii)
Synonym
Senecio douglasii var. tularensis
(Under Senecio flaccidus var. douglasii)
Synonym
Senecio elegansRED-PURPLE RAGWORTNaturalized
Senecio eurycephalus var. eurycephalus
(Under Packera eurycephala var. eurycephala)
Synonym
Senecio eurycephalus var. lewisrosei
(Under Packera eurycephala var. lewisrosei)
Synonym
Senecio flaccidusTHREADLEAF RAGWORTNative
Senecio flaccidus var. douglasiiDOUGLAS' THREADLEAF RAGWORTNative
Senecio flaccidus var. monoensisSMOOTH THREADLEAF RAGWORTNative
Senecio foetidus
(Under Senecio hydrophiloides)
Synonym
Senecio foetidus var. hydrophiloides
(Under Senecio hydrophiloides)
Synonym
Senecio fremontiiNative
Senecio fremontii var. fremontiiDWARF MOUNTAIN RAGWORTNative
Senecio fremontii var. occidentalisWESTERN DWARF MOUNTAIN RAGWORTNative
Senecio ganderi
(Under Packera ganderi)
Synonym
Senecio glomeratusCUTLEAF BURNWEEDNaturalized
Senecio greenei
(Under Packera greenei)
Synonym
Senecio hesperius
(Under Packera hesperia)
Synonym
Senecio hieraciifolius var. hieraciifolius
(Under Senecio)
Mentioned in
a note
Senecio hybridus
(Under Senecio)
Mentioned in
a note
Senecio hydrophiloidesSWEET MARSH RAGWORTNative
Senecio hydrophilusWATER RAGWORT, ALKALI-MARSH RAGWORTNative
Senecio indecorus
(Under Packera indecora)
Synonym
Senecio integerrimusNative
Senecio integerrimus var. exaltatusCOLUMBIA RAGWORTNative
Senecio integerrimus var. majorLAMBS-TONGUE RAGWORTNative
Senecio integerrimus var. ochroleucusPALE-YELLOW RAGWORTNative
Senecio ionophyllus
(Under Packera ionophylla)
Synonym
Senecio jacobaeaTANSY RAGWORTNaturalized
Senecio layneae
(Under Packera layneae)
Synonym
Senecio linearifolius var. linearifoliusLINEAR-LEAVED AUSTRALIAN FIREWEEDNaturalized
Senecio lyoniiISLAND SENECIONative
Senecio macounii
(Under Packera macounii)
Synonym
Senecio mikanioides
(Under Delairea odorata)
Synonym
Senecio minimusCOASTAL BURNWEEDNaturalized
Senecio mohavensisMOJAVE RAGWORTNative
Senecio mohavensis subsp. breviflorus
(Under Senecio mohavensis)
Mentioned in
a note
Senecio multilobatus
(Under Packera multilobata)
Synonym
Senecio pattersonensisMOUNT PATTERSON SENECIONative
Senecio pauciflorus
(Under Packera pauciflora)
Synonym
Senecio pseudaureus var. pseudaureus
(Under Packera pseudaurea var. pseudaurea)
Synonym
Senecio quadridentatusCOTTON BURNWEEDNaturalized
Senecio scorzonellaSIERRA RAGWORTNative
Senecio serra var. serraTALL RAGWORT, SAWTOOTH GROUNDSELNative
Senecio spartioidesBROOM-LIKE RAGWORTNative
Senecio spartioides var. multicapitatus
(Under Senecio spartioides)
Synonym
Senecio squalidus
(Under Senecio)
Mentioned in
a note
Senecio streptanthifolius
(Under Packera streptanthifolia var. streptanthifolia)
Synonym
Senecio sylvaticusWOODLAND RAGWORTNaturalized
Senecio triangularisARROWLEAF RAGWORTNative
Senecio vulgarisCOMMON GROUNDSELNaturalized
Senecio werneriifolius
(Under Packera werneriifolia)
Synonym
Senegalia
Senegalia greggiiCATCLAW, DEVIL'S CLAWNative
Senna
  ↳  Key to Senna
Senna armataSPINY SENNANative
Senna artemisioidesSILVER SENNANaturalized
Senna covesiiCOUES' CASSIANative
Senna didymobotryaNaturalized
Senna eremophila
(Under Senna artemisioides)
Synonym
Senna marilandicaMARYLAND SENNAWaif
Senna multiglandulosaNaturalized
Septimia multicava
(Under Crassula multicava subsp. multicava)
Synonym
SequoiaREDWOOD
Sequoia sempervirensNative
SequoiadendronGIANT SEQUOIA
Sequoiadendron giganteumNative
SericocarpusWHITE-TOPPED ASTER
Sericocarpus oregonensis
  ↳  Key to Sericocarpus oregonensis
Native
Sericocarpus oregonensis subsp. californicusNative
Sericocarpus oregonensis subsp. oregonensisNative
Sericocarpus oregonensis var. californicus
(Under Sericocarpus oregonensis subsp. californicus)
Synonym
Sericocarpus oregonensis var. oregonensis
(Under Sericocarpus oregonensis subsp. oregonensis)
Synonym
Sericocarpus tomentellus
(Under Eucephalus tomentellus)
Synonym
Sesbania
  ↳  Key to Sesbania
Sesbania exaltata
(Under Sesbania herbacea)
Synonym
Sesbania herbaceaBIGPOD SESBANIA, COFFEE WEED, COLORADO RIVER HEMPNative
Sesbania puniceaSCARLET SESBANNaturalized
Sesbania tripetii
(Under Sesbania punicea)
Synonym
SesuviumSEA-PURSLANE
Sesuvium portulacastrum
(Under Trianthema portulacastrum)
Synonym
Sesuvium verrucosumWESTERN SEA-PURSLANENative
Setaria
  ↳  Key to Setaria
BRISTLE GRASS
Setaria adhaerensBUR BRISTLE GRASSNaturalized
Setaria carnei
(Under Setaria verticillata)
Synonym
Setaria faberiCHINESE FOXTAILNaturalized
Setaria geniculata
(Under Setaria parviflora)
Synonym
Setaria glauca
(Under Setaria pumila subsp. pumila)
Synonym
Setaria gracilis
(Under Setaria parviflora)
Synonym
Setaria italica
(Under Setaria)
Mentioned in
a note
Setaria lutescens
(Under Setaria pumila subsp. pumila)
Synonym
Setaria megaphylla
(Under Setaria)
Mentioned in
a note
Setaria parvifloraKNOTROOT BRISTLE GRASSNative
Setaria pumila subsp. pumilaYELLOW BRISTLE GRASSNaturalized
Setaria sphacelataAFRICAN BRISTLE GRASSNaturalized
Setaria verticillataHOOKED BRISTLE GRASSNaturalized
Setaria verticilliformis
(Under Setaria)
Mentioned in
a note
Setaria viridisGREEN BRISTLE GRASSNaturalized
Seubertia crocea
(Under Triteleia crocea)
Synonym
Seubertia laxa
(Under Triteleia laxa)
Synonym
Seubertia obscura
(Under Triteleia laxa)
Synonym
Shepherdia
  ↳  Key to Shepherdia
Shepherdia argenteaBUFFALO-BERRYNative
Shepherdia canadensisCANADIAN BUFFALO-BERRYNative
Sherardia
Sherardia arvensisFIELD MADDERNaturalized
Sibara
  ↳  Key to Sibara
Sibara desertiDESERT WINGED ROCKCRESSNative
Sibara filifoliaSANTA CRUZ ISLAND ROCKCRESSNative
Sibara rosulata
(Under Sibara deserti)
Synonym
Sibara virginica
(Under Planodes virginica)
Synonym
Sibara virginica
(Under Sibara)
Mentioned in
a note
Sibaropsis
Sibaropsis hammittiiHAMMITT'S CLAY-CRESSNative
Sibbaldia
Sibbaldia procumbensNative
Sida
  ↳  Key to Sida
Sida abutifolia
(Under Sida)
Mentioned in
a note
Sida leprosa var. hederacea
(Under Malvella leprosa)
Synonym
Sida rhombifoliaSIDA, RHOMBUS-LEAVED SIDAWaif
Sida spinosaPRICKLY SIDAAgricultural weed
Sidalcea
  ↳  Key to Sidalcea
CHECKERBLOOM
Sidalcea asprellaNative
Sidalcea asprella subsp. asprellaHARSH CHECKERBLOOM, SIERRA FOOTHILLS CHECKERBLOOMNative
Sidalcea asprella subsp. nanaDWARF SIERRAN CHECKERBLOOMNative
Sidalcea calycosaVERNAL POOL CHECKERBLOOMNative
Sidalcea calycosa subsp. calycosaVERNAL POOL CHECKERBLOOM, HOGWALLOW CHECKERBLOOMNative
Sidalcea calycosa subsp. rhizomataPOINT REYES CHECKERBLOOMNative
Sidalcea celataREDDING CHECKERBLOOMNative
Sidalcea covilleiOWENS VALLEY CHECKERBLOOMNative
Sidalcea delphiniifolia
(Under Sidalcea malviflora subsp. malviflora)
Synonym
Sidalcea diploscyphaFRINGED CHECKERBLOOMNative
Sidalcea elegansDEL NORTE CHECKERBLOOMNative
Sidalcea favosa
(Under Sidalcea reptans)
Synonym
Sidalcea giganteaGIANT CHECKERBLOOMNative
Sidalcea glaucescensWAXY CHECKERBLOOMNative
Sidalcea hartwegiiHARTWEG'S CHECKERBLOOMNative
Sidalcea hickmaniiNative
Sidalcea hickmanii subsp. anomalaCUESTA PASS CHECKERBLOOMNative
Sidalcea hickmanii subsp. hickmaniiHICKMAN'S CHECKERBLOOMNative
Sidalcea hickmanii subsp. napensisNAPA CHECKERBLOOMNative
Sidalcea hickmanii subsp. parishiiPARISH'S CHECKERBLOOMNative
Sidalcea hickmanii subsp. pillsburiensisLAKE PILLSBURY CHECKERBLOOMNative
Sidalcea hickmanii subsp. viridisMARIN CHECKERBLOOMNative
Sidalcea hickmanii var. parishii
(Under Sidalcea hickmanii subsp. parishii)
Synonym
Sidalcea hirsutaHAIRY CHECKERBLOOMNative
Sidalcea keckiiKECK'S CHECKERBLOOMNative
Sidalcea malachroidesMAPLE-LEAVED CHECKERBLOOMNative
Sidalcea malvifloraCHECKERBLOOM, CHECKERMALLOWNative
Sidalcea malviflora subsp. asprella
(Under Sidalcea asprella subsp. asprella)
Synonym
Sidalcea malviflora subsp. californicaCHAPARRAL CHECKERBLOOM, CALIFORNIA CHECKERBLOOMNative
Sidalcea malviflora subsp. celata
(Under Sidalcea celata)
Synonym
Sidalcea malviflora subsp. dolosaBEAR VALLEY CHECKERBLOOMNative
Sidalcea malviflora subsp. elegans
(Under Sidalcea elegans)
Synonym
Sidalcea malviflora subsp. laciniataGERANIUM-LEAVED CHECKERBLOOMNative
Sidalcea malviflora subsp. malvifloraNative
Sidalcea malviflora subsp. nana
(Under Sidalcea asprella subsp. nana)
Synonym
Sidalcea malviflora subsp. patulaSISKIYOU CHECKERBLOOMNative
Sidalcea malviflora subsp. purpureaPURPLE-STEMMED CHECKERBLOOMNative
Sidalcea malviflora subsp. rostrataSEACLIFF CHECKERBLOOMNative
Sidalcea malviflora subsp. sparsifolia
(Under Sidalcea sparsifolia)
Synonym
Sidalcea malviflora var. celata
(Under Sidalcea celata)
Synonym
Sidalcea malviflora var. hirsuta
(Under Sidalcea sparsifolia)
Synonym
Sidalcea malviflora var. stellata
(Under Sidalcea sparsifolia)
Synonym
Sidalcea malviflora var. uliginosa
(Under Sidalcea sparsifolia)
Synonym
Sidalcea montana
(Under Sidalcea glaucescens)
Synonym
Sidalcea multifidaCUT-LEAF CHECKERBLOOMNative
Sidalcea neomexicanaSALT SPRING CHECKERBLOOMNative
Sidalcea neomexicana subsp. thurberi
(Under Sidalcea neomexicana)
Synonym
Sidalcea oreganaNative
Sidalcea oregana subsp. eximiaCOAST CHECKERBLOOMNative
Sidalcea oregana subsp. hydrophilaMARSH CHECKERBLOOMNative
Sidalcea oregana subsp. oreganaOREGON CHECKERBLOOMNative
Sidalcea oregana subsp. spicataNative
Sidalcea oregana subsp. validaKENWOOD MARSH CHECKERBLOOMNative
Sidalcea oregana var. maxima
(Under Sidalcea oregana subsp. oregana)
Mentioned in
a note
Sidalcea pedataBIRD-FOOT CHECKERBLOOMNative
Sidalcea ranunculaceaNative
Sidalcea reptansNative
Sidalcea reptans var. nana
(Under Sidalcea asprella subsp. nana)
Synonym
Sidalcea rhizomata
(Under Sidalcea calycosa subsp. rhizomata)
Synonym
Sidalcea robustaBUTTE COUNTY CHECKERBLOOMNative
Sidalcea rostrata
(Under Sidalcea malviflora subsp. rostrata)
Synonym
Sidalcea setosaBRISTLY CHECKERBLOOMNative
Sidalcea setosa
(Under Sidalcea oregana subsp. spicata)
Synonym
Sidalcea setosa var. setosa
(Under Sidalcea oregana subsp. spicata)
Synonym
Sidalcea sparsifoliaSOUTHERN CHECKERBLOOMNative
Sidalcea stipularisSCADDEN FLAT CHECKERBLOOMNative
Sidalcea virgata
(Under Sidalcea glaucescens)
Mentioned in
a note
Sidotheca
  ↳  Key to Sidotheca
STARRY PUNCTUREBRACT
Sidotheca caryophylloidesCHICKWEED OXYTHECANative
Sidotheca emarginataWHITE-MARGINED OXYTHECANative
Sidotheca trilobataTHREE-LOBED STARRY PUNCTUREBRACTNative
Sieglingia decumbens
(Under Danthonia decumbens)
Synonym
Silene
  ↳  Key to Silene
CATCHFLY, CAMPION
Silene antirrhinaSLEEPY CATCHFLYNative
Silene apertaNAKED CATCHFLY, TULARE CAMPIONNative
Silene armeriaSWEET-WILLIAM CATCHFLYNaturalized
Silene bernardinaPALMER'S CATCHFLYNative
Silene bernardina subsp. bernardina
(Under Silene bernardina)
Synonym
Silene bernardina subsp. maguirei
(Under Silene bernardina)
Synonym
Silene bernardina var. rigidula
(Under Silene bernardina)
Synonym
Silene bernardina var. sierrae
(Under Silene bernardina)
Synonym
Silene bolanderiBOLANDER'S CATCHFLYNative
Silene bridgesiiBRIDGES' CATCHFLYNative
Silene californica
(Under Silene laciniata subsp. californica)
Synonym
Silene californica
(Under Silene laciniata)
Mentioned in
a note
Silene campanulataNative
Silene campanulata subsp. campanulataRED MOUNTAIN CATCHFLYNative
Silene campanulata subsp. glandulosaBELL CATCHFLYNative
Silene campanulata subsp. greenei
(Under Silene campanulata subsp. glandulosa)
Synonym
Silene campanulata var. petrophila
(Under Silene campanulata subsp. glandulosa)
Synonym
Silene conifloraMULTINERVED CATCHFLYNaturalized
Silene conoideaLARGE SAND CATCHFLYNaturalized
Silene coronaria
(Under Lychnis coronaria)
Synonym
Silene cucubalus
(Under Silene vulgaris)
Synonym
Silene dichotoma subsp. dichotomaFORKED CATCHFLYNaturalized
Silene douglasii var. douglasiiDOUGLAS' CATCHFLYNative
Silene douglasii var. monantha
(Under Silene douglasii var. douglasii)
Synonym
Silene gallicaSMALL-FLOWER CATCHFLY, WINDMILL PINKNaturalized
Silene grandis
(Under Silene scouleri subsp. scouleri)
Synonym
Silene grayiGRAY'S CATCHFLYNative
Silene hookeriHOOKER'S CATCHFLYNative
Silene hookeri subsp. bolanderi
(Under Silene bolanderi)
Synonym
Silene hookeri subsp. pulverulenta
(Under Silene hookeri)
Synonym
Silene invisaSHORT-PETALED CAMPIONNative
Silene laciniataNative
Silene laciniata subsp. brandegeei
(Under Silene laciniata subsp. laciniata)
Synonym
Silene laciniata subsp. californicaCALIFORNIA PINKNative
Silene laciniata subsp. laciniataMEXICAN PINKNative
Silene laciniata subsp. major
(Under Silene laciniata subsp. laciniata)
Synonym
Silene laciniata var. angustifolia
(Under Silene laciniata subsp. laciniata)
Synonym
Silene laciniata var. latifolia
(Under Silene laciniata subsp. laciniata)
Synonym
Silene latifoliaWHITE CAMPIONNaturalized
Silene latifolia subsp. alba
(Under Silene latifolia)
Synonym
Silene lemmoniiLEMMON'S CATCHFLYNative
Silene marmorensisMARBLE MOUNTAIN CAMPIONNative
Silene menziesiiMENZIES' CATCHFLYNative
Silene montana subsp. bernardina
(Under Silene bernardina)
Synonym
Silene montana subsp. montana
(Under Silene bernardina)
Synonym
Silene montana var. rigidula
(Under Silene bernardina)
Synonym
Silene montana var. sierrae
(Under Silene bernardina)
Synonym
Silene multinervia
(Under Silene coniflora)
Synonym
Silene noctifloraNIGHT-FLOWERING CATCHFLYNaturalized
Silene nudaSTICKY CATCHFLYNative
Silene nuda subsp. insectivora
(Under Silene nuda)
Synonym
Silene occidentalisWESTERN CAMPIONNative
Silene occidentalis subsp. longistipitata
(Under Silene occidentalis)
Synonym
Silene occidentalis subsp. occidentalis
(Under Silene occidentalis)
Synonym
Silene oreganaOREGON CAMPIONNative
Silene parishiiPARISH'S CATCHFLYNative
Silene parishii var. latifolia
(Under Silene parishii)
Synonym
Silene parishii var. viscida
(Under Silene parishii)
Synonym
Silene pendulaDROOPING CATCHFLYWaif
Silene pseudatocionWaif
Silene salmonaceaKLAMATH MOUNTAIN CATCHFLY, SALMON-FLOWERED CATCHFLYNative
Silene sargentiiSARGENT'S CATCHFLYNative
Silene scouleri subsp. grandis
(Under Silene scouleri subsp. scouleri)
Synonym
Silene scouleri subsp. scouleriSCOULER'S CATCHFLYNative
Silene scouleri var. pacifica
(Under Silene scouleri subsp. scouleri)
Synonym
Silene scouleri var. scouleri
(Under Silene scouleri subsp. scouleri)
Synonym
Silene serpentinicolaSERPENTINE CATCHFLYNative
Silene suksdorfiiCASCADE ALPINE CAMPION, SUKSDORF'S CATCHFLYNative
Silene verecundaSAN FRANCISCO CAMPIONNative
Silene verecunda subsp. andersonii
(Under Silene verecunda)
Synonym
Silene verecunda subsp. platyota
(Under Silene verecunda)
Synonym
Silene verecunda subsp. verecunda
(Under Silene verecunda)
Synonym
Silene verecunda var. eglandulosa
(Under Silene verecunda)
Synonym
Silene verecunda var. platyota
(Under Silene verecunda)
Synonym
Silene verecunda var. verecunda
(Under Silene verecunda)
Synonym
Silene vulgarisBLADDER CAMPIONNaturalized
SilybumMILK THISTLE
Silybum marianumNaturalized
Simaroubaceae
  ↳  Key to Simaroubaceae
QUASSIA or SIMAROUBA FAMILY
SimmondsiaGOAT-NUT, JOJOBA
Simmondsia californica
(Under Simmondsia chinensis)
Synonym
Simmondsia chinensisNative
SimmondsiaceaeJOJOBA FAMILY
Sinapis
  ↳  Key to Sinapis
Sinapis albaWHITE MUSTARDNaturalized
Sinapis arvensisCHARLOCKNaturalized
Sisymbrium
  ↳  Key to Sisymbrium
Sisymbrium altissimumTUMBLE MUSTARDNaturalized
Sisymbrium erysimoidesNaturalized
Sisymbrium irioLONDON ROCKETNaturalized
Sisymbrium loeseliiNaturalized
Sisymbrium officinaleHEDGE MUSTARDNaturalized
Sisymbrium orientaleNaturalized
Sisyrinchium
  ↳  Key to Sisyrinchium
Sisyrinchium bellumWESTERN BLUE-EYED-GRASSNative
Sisyrinchium boreale
(Under Sisyrinchium californicum)
Synonym
Sisyrinchium brachypus
(Under Sisyrinchium californicum)
Synonym
Sisyrinchium californicumGOLDEN-EYED-GRASSNative
Sisyrinchium douglasii
(Under Sisyrinchium)
Mentioned in
a note
Sisyrinchium douglasii var. douglasii
(Under Olsynium douglasii var. douglasii)
Synonym
Sisyrinchium eastwoodiae
(Under Sisyrinchium bellum)
Synonym
Sisyrinchium elmeriELMER'S BLUE-EYED-GRASSNative
Sisyrinchium flavidum
(Under Sisyrinchium californicum)
Synonym
Sisyrinchium funereumDEATH VALLEY BLUE-EYED-GRASSNative
Sisyrinchium grandiflorum
(Under Olsynium douglasii var. douglasii)
Synonym
Sisyrinchium greenei
(Under Sisyrinchium bellum)
Synonym
Sisyrinchium halophilumNEVADA BLUE-EYED-GRASSNative
Sisyrinchium hesperium
(Under Sisyrinchium bellum)
Synonym
Sisyrinchium hitchcockiiHITCHCOCK'S BLUE-EYED-GRASSNative
Sisyrinchium idahoenseIDAHO BLUE-EYED-GRASSNative
Sisyrinchium idahoense var. idahoenseNative
Sisyrinchium idahoense var. occidentaleNative
Sisyrinchium leptocaulon
(Under Sisyrinchium halophilum)
Synonym
Sisyrinchium lineatum
(Under Sisyrinchium californicum)
Synonym
Sisyrinchium longipesTIMBERLAND BLUE-EYED-GRASSNative
Sisyrinchium maritimum
(Under Sisyrinchium bellum)
Synonym
Sisyrinchium occidentale
(Under Sisyrinchium idahoense var. occidentale)
Synonym
Sisyrinchium oreophilum
(Under Sisyrinchium idahoense var. idahoense)
Synonym
Sisyrinchium oreophilum var. occidentale
(Under Sisyrinchium idahoense var. occidentale)
Synonym
Sitanion hansenii
(Under Elymus elymoides)
Mentioned in
a note
Sitanion hystrix
(Under Elymus elymoides)
Synonym
Sitanion hystrix var. californicum
(Under Elymus elymoides var. californicus)
Synonym
Sitanion hystrix var. hystrix
(Under Elymus elymoides var. elymoides)
Synonym
Sitanion jubatum
(Under Elymus multisetus)
Synonym
Sitanion longifolium
(Under Elymus elymoides var. brevifolius)
Synonym
Sium
Sium suaveNative
Smelowskia
Smelowskia ovalisNative
Smelowskia ovalis var. congesta
(Under Smelowskia ovalis)
Synonym
SmilacaceaeSMILAX FAMILY
Smilacina racemosa
(Under Maianthemum racemosum)
Synonym
Smilacina racemosa var. amplexicaulis
(Under Maianthemum racemosum)
Synonym
Smilacina racemosa var. glabra
(Under Maianthemum racemosum)
Synonym
Smilacina stellata
(Under Maianthemum stellatum)
Synonym
Smilacina stellata var. sessilifolia
(Under Maianthemum stellatum)
Synonym
Smilax
  ↳  Key to Smilax
GREENBRIER
Smilax californicaNative
Smilax herbacea
(Under Smilax jamesii)
Mentioned in
a note
Smilax jamesiiENGLISH PEAK GREENBRIERNative
Solanaceae
  ↳  Key to Solanaceae
NIGHTSHADE FAMILY
Solanoa purpurescens
(Under Asclepias solanoana)
Synonym
Solanum
  ↳  Key to Solanum
NIGHTSHADE
Solanum americanumNative
Solanum aviculareNaturalized
Solanum carolinenseCAROLINA HORSE-NETTLENaturalized
Solanum clokeyi
(Under Solanum wallacei)
Synonym
Solanum dimidiatumTORREY'S NIGHTSHADEJfp-4, urban weed
Solanum douglasiiNative
Solanum dulcamaraNaturalized
Solanum elaeagnifoliumWHITE HORSE-NETTLENaturalized
Solanum furcatumNaturalized
Solanum lanceolatumLANCELEAF NIGHTSHADENaturalized
Solanum lycopersicum
(Under Lycopersicon esculentum)
Synonym
Solanum marginatumWHITE-MARGINED NIGHTSHADENaturalized
Solanum mauritianum
(Under Solanum aviculare)
Mentioned in
a note
Solanum nigrumBLACK NIGHTSHADENaturalized
Solanum nodiflorum
(Under Solanum americanum)
Synonym
Solanum parishiiNative
Solanum peruvianum
(Under Lycopersicon peruvianum)
Synonym
Solanum physalifolium var. nitidibaccatumNaturalized
Solanum rostratumBUFFALOBURNaturalized
Solanum sarrachoides
(Under Solanum physalifolium var. nitidibaccatum)
Synonym
Solanum sisymbriifoliumNaturalized
Solanum tenuilobatum
(Under Solanum xanti)
Synonym
Solanum torreyi
(Under Solanum dimidiatum)
Synonym
Solanum triflorumNaturalized
Solanum tuberosum
(Under Solanum)
Mentioned in
a note
Solanum umbelliferumNative
Solanum umbelliferum var. glabrescens
(Under Solanum umbelliferum)
Synonym
Solanum umbelliferum var. incanum
(Under Solanum umbelliferum)
Synonym
Solanum wallaceiWALLACE'S NIGHTSHADENative
Solanum wallacei var. clokeyi
(Under Solanum wallacei)
Synonym
Solanum xantiNative
Solanum xanti var. hoffmannii
(Under Solanum xanti)
Synonym
Solanum xanti var. intermedium
(Under Solanum xanti)
Synonym
Solanum xanti var. montanum
(Under Solanum xanti)
Synonym
Solanum xanti var. obispoense
(Under Solanum xanti)
Synonym
SoleiroliaBABY'S TEARS
Soleirolia soleiroliiNaturalized
Solidago
  ↳  Key to Solidago
GOLDENROD
Solidago altissima subsp. altissimaLATE GOLDENRODNaturalized
Solidago altissima var. altissima
(Under Solidago altissima subsp. altissima)
Synonym
Solidago californica
(Under Solidago velutina subsp. californica)
Synonym
Solidago canadensis
(Under Solidago elongata)
Mentioned in
a note
Solidago canadensis
(Under Solidago lepida var. salebrosa)
Mentioned in
a note
Solidago canadensis subsp. elongata
(Under Solidago elongata)
Synonym
Solidago canadensis var. elongata
(Under Solidago elongata)
Synonym
Solidago canadensis var. salebrosa
(Under Solidago lepida var. salebrosa)
Synonym
Solidago confinisSOUTHERN GOLDENRODNative
Solidago elongataWEST COAST CANADA GOLDENRODNative
Solidago gigantea
(Under Solidago lepida var. salebrosa)
Synonym
Solidago guiradonisGUIRADO'S GOLDENRODNative
Solidago guiradonis var. spectabilis
(Under Solidago spectabilis)
Synonym
Solidago lepida
(Under Solidago elongata)
Mentioned in
a note
Solidago lepida
(Under Solidago lepida var. salebrosa)
Mentioned in
a note
Solidago lepida var. lepida
(Under Solidago lepida var. salebrosa)
Mentioned in
a note
Solidago lepida var. salebrosaWESTERN GOLDENRODNative
Solidago missouriensis
(Under Solidago spectabilis)
Synonym
Solidago multiradiataNORTHERN GOLDENRODNative
Solidago occidentalis
(Under Euthamia occidentalis)
Synonym
Solidago sparsiflora
(Under Solidago velutina subsp. sparsiflora)
Synonym
Solidago spathulataCOAST GOLDENRODNative
Solidago spectabilisSHOWY GOLDENRODNative
Solidago spectabilis var. confinis
(Under Solidago confinis)
Synonym
Solidago velutinaVELVETY GOLDENRODNative
Solidago velutina subsp. californicaCALIFORNIA GOLDENRODNative
Solidago velutina subsp. sparsifloraNative
Soliva
Soliva daucifolia
(Under Soliva sessilis)
Synonym
Soliva pterosperma
(Under Soliva sessilis)
Synonym
Soliva sessilisNaturalized
Sollya fusiformis
(Under Billardiera heterophylla)
Mentioned in
a note
Sollya heterophylla
(Under Billardiera heterophylla)
Synonym
Sonchus
  ↳  Key to Sonchus
SOW THISTLE
Sonchus arvensisPERENNIAL SOW THISTLENaturalized
Sonchus arvensis subsp. arvensisAgricultural weed
Sonchus arvensis subsp. uliginosusNaturalized
Sonchus asper
(Under Sonchus oleraceus)
Mentioned in
a note
Sonchus asper subsp. asperPRICKLY SOW THISTLENaturalized
Sonchus oleraceusCOMMON SOW THISTLENaturalized
Sonchus tenerrimusNaturalized
Sophia nelsonii
(Under Descurainia nelsonii)
Synonym
Sophora secundiflora
(Under Calia secundiflora)
Synonym
Sorbus
  ↳  Key to Sorbus
MOUNTAIN ASH
Sorbus aucupariaEUROPEAN MOUNTAIN ASHWaif
Sorbus californicaCALIFORNIA MOUNTAIN ASHNative
Sorbus cascadensis
(Under Sorbus scopulina)
Synonym
Sorbus occidentalis
(Under Sorbus sitchensis var. grayi)
Synonym
Sorbus scopulinaROCKY MOUNTAIN or CASCADE MOUNTAIN ASHNative
Sorbus scopulina var. cascadensis
(Under Sorbus scopulina)
Synonym
Sorbus sitchensisNative
Sorbus sitchensis var. densa
(Under Sorbus scopulina)
Synonym
Sorbus sitchensis var. grayiDWARF or GRAY'S MOUNTAIN ASHNative
Sorbus sitchensis var. sitchensisSITKA MOUNTAIN ASHNative
Sorghum
  ↳  Key to Sorghum
Sorghum bicolorSORGHUMNaturalized
Sorghum halepenseJOHNSON GRASSNaturalized
Sorghum lanceolatum
(Under Sorghum bicolor)
Synonym
Sorghum sudanense
(Under Sorghum bicolor)
Synonym
Sorghum virgatum
(Under Sorghum bicolor)
Synonym
Sparaxis
  ↳  Key to Sparaxis
SPARAXIS
Sparaxis grandifloraBUTTER CUPWaif
Sparaxis tricolorHARLEQUIN FLOWERWaif
Sparganium
  ↳  Key to Sparganium
BUR-REED
Sparganium angustifoliumNARROW-LEAVED BUR-REEDNative
Sparganium angustifolium subsp. emersum
(Under Sparganium emersum)
Synonym
Sparganium angustifolium var. multipedunculatum
(Under Sparganium angustifolium)
Synonym
Sparganium californicum
(Under Sparganium eurycarpum var. eurycarpum)
Mentioned in
a note
Sparganium chlorocarpum
(Under Sparganium emersum)
Synonym
Sparganium chlorocarpum var. acaule
(Under Sparganium emersum)
Synonym
Sparganium emersumNative
Sparganium emersum subsp. acaule
(Under Sparganium emersum)
Synonym
Sparganium emersum var. multipedunculatum
(Under Sparganium angustifolium)
Synonym
Sparganium erectum
(Under Sparganium eurycarpum)
Mentioned in
a note
Sparganium erectum subsp. stoloniferum
(Under Sparganium eurycarpum var. greenei)
Synonym
Sparganium eurycarpumNative
Sparganium eurycarpum subsp. eurycarpum
(Under Sparganium eurycarpum var. eurycarpum)
Synonym
Sparganium eurycarpum var. eurycarpumNative
Sparganium eurycarpum var. greeneiNative
Sparganium greenei
(Under Sparganium eurycarpum var. greenei)
Synonym
Sparganium minimum
(Under Sparganium natans)
Synonym
Sparganium multipedunculatum
(Under Sparganium angustifolium)
Synonym
Sparganium natansSMALL BUR-REEDNative
Sparganium simplex var. multipedunculatum
(Under Sparganium angustifolium)
Synonym
Spartina
  ↳  Key to Spartina
CORD GRASS
Spartina alternifloraSALT-WATER CORD GRASSNaturalized
Spartina anglica
(Under Spartina)
Mentioned in
a note
Spartina densifloraDENSE-FLOWERED CORD GRASSNaturalized
Spartina foliosaCALIFORNIA CORD GRASSNative
Spartina gracilisALKALI CORD GRASSNative
Spartina patensSALT-MEADOW CORD GRASSNaturalized
Spartium
Spartium junceumSPANISH BROOMNaturalized
SpergulaSPURREY
Spergula arvensisSTICKWORT, STARWORTNaturalized
Spergularia
  ↳  Key to Spergularia
SAND-SPURREY
Spergularia atrospermaBLACK SEED SAND-SPURREYNative
Spergularia bocconei
(Under Spergularia bocconi)
Synonym
Spergularia bocconiBOCCONE'S SAND-SPURREYNaturalized
Spergularia canadensis var. occidentalisWESTERN SAND-SPURREYNative
Spergularia macrothecaSTICKY SAND-SPURREYNative
Spergularia macrotheca var. leucanthaNative
Spergularia macrotheca var. longistylaNative
Spergularia macrotheca var. macrothecaNative
Spergularia marinaSALTMARSH SAND-SPURREYNative
Spergularia marina var. tenuis
(Under Spergularia marina)
Synonym
Spergularia maritima
(Under Spergularia media var. media)
Synonym
Spergularia media
(Under Spergularia media var. media)
Mentioned in
a note
Spergularia media var. mediaGREATER SEA-SPURREYNaturalized
Spergularia platensis var. platensisLA PLATA SAND-SPURREYNaturalized
Spergularia rubraRED SAND-SPURREYNaturalized
Spergularia salina
(Under Spergularia marina)
Synonym
Spergularia villosaHAIRY SAND-SPURREYNaturalized
Spermolepis
Spermolepis echinataBRISTLY SCALESEEDNative
Sphaeralcea
  ↳  Key to Sphaeralcea
GLOBEMALLOW
Sphaeralcea ambiguaNative
Sphaeralcea ambigua subsp. ambigua
(Under Sphaeralcea ambigua var. ambigua)
Synonym
Sphaeralcea ambigua subsp. monticola
(Under Sphaeralcea ambigua var. ambigua)
Synonym
Sphaeralcea ambigua subsp. rosacea
(Under Sphaeralcea ambigua var. rosacea)
Synonym
Sphaeralcea ambigua subsp. rugosa
(Under Sphaeralcea ambigua var. rugosa)
Synonym
Sphaeralcea ambigua var. aculeata
(Under Sphaeralcea ambigua var. ambigua)
Synonym
Sphaeralcea ambigua var. ambiguaAPRICOT MALLOWNative
Sphaeralcea ambigua var. monticola
(Under Sphaeralcea ambigua var. ambigua)
Synonym
Sphaeralcea ambigua var. rosaceaPARISH MALLOWNative
Sphaeralcea ambigua var. rugosaROUGHLEAF APRICOT MALLOWNative
Sphaeralcea angustifoliaNARROW-LEAVED GLOBEMALLOWNative
Sphaeralcea angustifolia var. cuspidata
(Under Sphaeralcea angustifolia)
Synonym
Sphaeralcea angustifolia var. oblongifolia
(Under Sphaeralcea angustifolia)
Synonym
Sphaeralcea coulteriCOULTER'S GLOBEMALLOWNative
Sphaeralcea emoryi
(Under Sphaeralcea angustifolia)
Mentioned in
a note
Sphaeralcea emoryi var. arida
(Under Sphaeralcea emoryi var. emoryi)
Synonym
Sphaeralcea emoryi var. emoryiEMORY'S GLOBEMALLOWNative
Sphaeralcea emoryi var. nevadensis
(Under Sphaeralcea angustifolia)
Synonym
Sphaeralcea emoryi var. variabilis
(Under Sphaeralcea emoryi var. emoryi)
Synonym
Sphaeralcea grossulariifoliaGOOSEBERRY-LEAVED GLOBEMALLOWNative
Sphaeralcea grossulariifolia var. fumariensis
(Under Sphaeralcea grossulariifolia)
Mentioned in
a note
Sphaeralcea grossulariifolia var. grossulariifolia
(Under Sphaeralcea grossulariifolia)
Synonym
Sphaeralcea munroanaMUNRO'S DESERT-MALLOWNative
Sphaeralcea orcuttiiCARRIZO MALLOWNative
Sphaeralcea rusbyi subsp. eremicola
(Under Sphaeralcea rusbyi var. eremicola)
Synonym
Sphaeralcea rusbyi var. eremicolaRUSBY'S DESERT-MALLOWNative
Sphaeromeria
  ↳  Key to Sphaeromeria
Sphaeromeria canaGRAY CHICKENSAGENative
Sphaeromeria potentilloidesFIVEFINGER CHICKENSAGENative
Sphaeromeria potentilloides var. nitrophilaALKALI TANSY-SAGENative
Sphaeromeria potentilloides var. potentilloidesNative
Sphaerophysa
Sphaerophysa salsulaAUSTRIAN PEAWEEDExtirpated alien
SphaeropterisAUSTRALIAN TREE FERN
Sphaeropteris cooperiCOOPER'S TREE FERNNaturalized
SphenopholisWEDGE GRASS
Sphenopholis obtusataPRAIRIE WEDGE GRASSNative
Sphenosciadium
Sphenosciadium capitellatumSWAMP WHITE HEADS, RANGER'S BUTTONSNative
Spinacia oleracea
(Under Chenopodiaceae)
Mentioned in
a note
Spiraea
  ↳  Key to Spiraea
Spiraea densiflora
(Under Spiraea splendens)
Synonym
Spiraea densiflora subsp. splendens
(Under Spiraea splendens)
Synonym
Spiraea douglasiiNative
Spiraea helleri
(Under Spiraea splendens)
Synonym
Spiraea splendensNative
Spiraea splendens var. splendens
(Under Spiraea splendens)
Synonym
Spiranthes
  ↳  Key to Spiranthes
LADIES TRESSES
Spiranthes porrifoliaNative
Spiranthes romanzoffianaNative
Spiranthes stellata
(Under Spiranthes)
Mentioned in
a note
SpirodelaDUCKMEAT
Spirodela oligorrhiza
(Under Landoltia punctata)
Synonym
Spirodela polyrhizaNative
Spirodela punctata
(Under Landoltia punctata)
Synonym
Sporobolus
  ↳  Key to Sporobolus
DROPSEED, SACATON
Sporobolus airoidesALKALI SACATONNative
Sporobolus airoides var. wrightii
(Under Sporobolus wrightii)
Synonym
Sporobolus contractusSPIKE DROPSEEDNative
Sporobolus creber
(Under Sporobolus indicus)
Synonym
Sporobolus cryptandrusSAND DROPSEEDNative
Sporobolus cryptandrus var. strictus
(Under Sporobolus contractus)
Synonym
Sporobolus flexuosusMESA DROPSEEDNative
Sporobolus floridanus
(Under Sporobolus flexuosus)
Mentioned in
a note
Sporobolus indicusSMUT GRASSNaturalized
Sporobolus indicus var. creber
(Under Sporobolus indicus)
Synonym
Sporobolus nealleyi
(Under Sporobolus cryptandrus)
Mentioned in
a note
Sporobolus neglectus
(Under Sporobolus vaginiflorus)
Mentioned in
a note
Sporobolus poiretii
(Under Sporobolus indicus)
Synonym
Sporobolus vaginiflorusPOVERTY DROPSEEDNaturalized
Sporobolus wrightiiBIG SACATONNative
Stachys
  ↳  Key to Stachys
HEDGE-NETTLE
Stachys ajugoidesNative
Stachys ajugoides var. cymosa
(Under Stachys pycnantha)
Synonym
Stachys ajugoides var. quercetorum
(Under Stachys rigida var. quercetorum)
Synonym
Stachys ajugoides var. rigida
(Under Stachys bergii)
Synonym
Stachys ajugoides var. rigida
(Under Stachys mexicana)
Synonym
Stachys ajugoides var. rigida
(Under Stachys rigida var. quercetorum)
Synonym
Stachys ajugoides var. rigida
(Under Stachys rigida var. rigida)
Synonym
Stachys ajugoides var. stricta
(Under Stachys stricta)
Synonym
Stachys albensNative
Stachys albens var. juliensis
(Under Stachys albens)
Synonym
Stachys arvensis
(Under Stachys)
Mentioned in
a note
Stachys bergiiNative
Stachys bullataNative
Stachys californica
(Under Stachys bullata)
Synonym
Stachys chamissonisNative
Stachys chamissonis var. cooleyae
(Under Stachys chamissonis)
Mentioned in
a note
Stachys cooleyae
(Under Stachys chamissonis)
Mentioned in
a note
Stachys flaccida
(Under Stachys chamissonis)
Synonym
Stachys floridana
(Under Stachys)
Mentioned in
a note
Stachys gracilenta
(Under Stachys rigida var. quercetorum)
Synonym
Stachys lanuginosa
(Under Stachys albens)
Synonym
Stachys malacophylla
(Under Stachys albens)
Synonym
Stachys mexicanaNative
Stachys palustris subsp. pilosa
(Under Stachys pilosa)
Synonym
Stachys pilosaPRAIRIE WOUNDWORTNative
Stachys pycnanthaSHORT-SPIKED HEDGE NETTLENative
Stachys quercetorum
(Under Stachys rigida var. quercetorum)
Synonym
Stachys ramosa
(Under Stachys ajugoides)
Synonym
Stachys rigidaNative
Stachys rigida subsp. lanata
(Under Stachys bergii)
Synonym
Stachys rigida subsp. quercetorum
(Under Stachys rigida var. quercetorum)
Synonym
Stachys rigida subsp. rivularis
(Under Stachys rigida var. rigida)
Synonym
Stachys rigida var. quercetorumNative
Stachys rigida var. rigidaNative
Stachys stebbinsiiNative
Stachys strictaNative
Stachys velutina
(Under Stachys albens)
Synonym
Stachys veronicifolia
(Under Stachys rigida var. rigida)
Synonym
Stachys viarum
(Under Stachys rigida var. quercetorum)
Synonym
Stanleya
  ↳  Key to Stanleya
PRINCE'S PLUME
Stanleya elataNative
Stanleya pinnata subsp. inyoensis
(Under Stanleya pinnata var. pinnata)
Synonym
Stanleya pinnata var. integrifolia
(Under Stanleya pinnata var. pinnata)
Mentioned in
a note
Stanleya pinnata var. inyoensis
(Under Stanleya pinnata var. pinnata)
Synonym
Stanleya pinnata var. pinnataNative
Stanleya pinnata var. texana
(Under Stanleya pinnata var. pinnata)
Mentioned in
a note
Stanleya viridifloraGREEN-FLOWERED PRINCE'S PLUMENative
StaphyleaBLADDERNUT
Staphylea bolanderiSIERRA BLADDERNUTNative
StaphyleaceaeBLADDERNUT FAMILY
Statice perezii
(Under Limonium perezii)
Synonym
Stebbinsoseris
  ↳  Key to Stebbinsoseris
Stebbinsoseris decipiensSANTA CRUZ MICROSERISNative
Stebbinsoseris heterocarpaGRASSLAND SILVERPUFFSNative
Stellaria
  ↳  Key to Stellaria
CHICKWEED, STARWORT
Stellaria borealis subsp. borealis
(Under Stellaria borealis subsp. sitchana)
Mentioned in
a note
Stellaria borealis subsp. sitchanaSITKA STARWORTNative
Stellaria borealis var. bongardiana
(Under Stellaria borealis subsp. sitchana)
Synonym
Stellaria calycanthaNORTHERN STARWORTNative
Stellaria calycantha subsp. interior
(Under Stellaria calycantha)
Synonym
Stellaria calycantha var. bongardiana
(Under Stellaria borealis subsp. sitchana)
Synonym
Stellaria calycantha var. simcoei
(Under Stellaria calycantha)
Synonym
Stellaria calycantha var. sitchana
(Under Stellaria borealis subsp. sitchana)
Synonym
Stellaria crispaCRISP STARWORTNative
Stellaria dichotoma
(Under Stellaria littoralis)
Mentioned in
a note
Stellaria gramineaCOMMON STARWORTNaturalized
Stellaria jamesiana
(Under Pseudostellaria jamesiana)
Synonym
Stellaria lagunensis
(Under Arenaria lanuginosa var. saxosa)
Synonym
Stellaria littoralisBEACH STARWORTNative
Stellaria longifoliaLONG-LEAVED STARWORTNative
Stellaria longipes subsp. longipesGOLDIE'S STARWORTNative
Stellaria longipes var. laeta
(Under Stellaria longipes subsp. longipes)
Synonym
Stellaria longipes var. longipes
(Under Stellaria longipes subsp. longipes)
Synonym
Stellaria mediaCOMMON CHICKWEEDNaturalized
Stellaria media subsp. neglecta
(Under Stellaria neglecta)
Synonym
Stellaria media subsp. pallida
(Under Stellaria pallida)
Synonym
Stellaria neglectaGREATER CHICKWEEDNaturalized
Stellaria nitensSHINING CHICKWEEDNative
Stellaria obtusaOBTUSE STARWORT, ROCKY MOUNTAIN STARWORTNative
Stellaria pallidaLESSER CHICKWEEDNaturalized
Stellaria sitchana var. bongardiana
(Under Stellaria borealis subsp. sitchana)
Synonym
Stellaria umbellataUMBELLATE STARWORTNative
Stemodia
Stemodia durantifoliaPURPLE STEMODIANative
Stemodia durantifolia var. chilensis
(Under Stemodia durantifolia)
Mentioned in
a note
Stenanthium
Stenanthium occidentaleNative
Stenophyllus capillaris
(Under Bulbostylis capillaris)
Synonym
Stenotaphrum
Stenotaphrum secundatumSAINT AUGUSTINE GRASSNaturalized
Stenotus
  ↳  Key to Stenotus
Stenotus acaulisSTEMLESS GOLDENWEEDNative
Stenotus lanuginosus var. lanuginosusWOOLLY STENOTUSNative
Stenotus stenophyllus
(Under Nestotus stenophyllus)
Synonym
Stenotus stenophyllus
(Under Stenotus)
Mentioned in
a note
Stephanomeria
  ↳  Key to Stephanomeria
Stephanomeria blairii
(Under Munzothamnus blairii)
Synonym
Stephanomeria blairii
(Under Stephanomeria)
Mentioned in
a note
Stephanomeria cichoriaceaSILVER ROCK-LETTUCE, CHICORYLEAF WIRE-LETTUCENative
Stephanomeria diegensisNative
Stephanomeria elataNative
Stephanomeria exiguaNative
Stephanomeria exigua subsp. carotiferaNative
Stephanomeria exigua subsp. coronariaNative
Stephanomeria exigua subsp. deaneiNative
Stephanomeria exigua subsp. exiguaNative
Stephanomeria exigua subsp. macrocarpaNative
Stephanomeria lactucinaNative
Stephanomeria minor
(Under Stephanomeria tenuifolia)
Synonym
Stephanomeria minor var. minor
(Under Stephanomeria tenuifolia)
Synonym
Stephanomeria minor var. myrioclada
(Under Stephanomeria tenuifolia)
Synonym
Stephanomeria paniculataNative
Stephanomeria parryiNative
Stephanomeria paucifloraWIRE-LETTUCENative
Stephanomeria pauciflora var. parishii
(Under Stephanomeria pauciflora)
Synonym
Stephanomeria pauciflora var. pauciflora
(Under Stephanomeria pauciflora)
Synonym
Stephanomeria runcinata var. parishii
(Under Stephanomeria pauciflora)
Synonym
Stephanomeria spinosa
(Under Pleiacanthus spinosus)
Synonym
Stephanomeria spinosa
(Under Stephanomeria)
Mentioned in
a note
Stephanomeria tenuifoliaNARROW-LEAVED WIRE-LETTUCENative
Stephanomeria tenuifolia var. myrioclada
(Under Stephanomeria tenuifolia)
Synonym
Stephanomeria tomentosa
(Under Stephanomeria virgata subsp. virgata)
Synonym
Stephanomeria virgataNative
Stephanomeria virgata subsp. pleurocarpaNative
Stephanomeria virgata subsp. virgataNative
Stillingia
  ↳  Key to Stillingia
Stillingia linearifoliaNative
Stillingia paucidentataNative
Stillingia spinulosaNative
Stipa
  ↳  Key to Stipa
NEEDLE GRASS
Stipa aridaMORMON NEEDLE GRASSNative
Stipa brachychaetaPUNA NEEDLE GRASSNaturalized
Stipa capensisCAPE RICE GRASSNaturalized
Stipa caudata
(Under Stipa)
Mentioned in
a note
Stipa cernuaNODDING NEEDLE GRASSNative
Stipa chaetophoraSTIPOID RICE GRASSNaturalized
Stipa clandestina
(Under Stipa)
Mentioned in
a note
Stipa columbiana
(Under Stipa nelsonii var. dorei)
Synonym
Stipa comataNEEDLE-AND-THREADNative
Stipa comata var. comataNative
Stipa comata var. intermediaNative
Stipa coronataCRESTED NEEDLE GRASSNative
Stipa diegoensisSAN DIEGO NEEDLE GRASSNative
Stipa divaricataSMALL-FLOWERED RICE GRASSNative
Stipa exiguaLITTLE RICE GRASSNative
Stipa formicarum
(Under Stipa manicata)
Synonym
Stipa hymenoidesSAND RICE GRASSNative
Stipa kingiiKING'S RICE GRASSNative
Stipa latiglumisWIDE-GLUMED NEEDLE GRASSNative
Stipa lemmoniiLEMMON'S NEEDLE GRASSNative
Stipa lemmonii var. lemmoniiNative
Stipa lemmonii var. pubescensNative
Stipa lepidaFOOTHILL NEEDLE GRASSNative
Stipa lettermaniiLETTERMAN'S NEEDLE GRASSNative
Stipa manicataANDEAN TUSSOCK GRASSNaturalized
Stipa mauritanicaMAURITANIAN GRASSNaturalized
Stipa miliacea var. miliaceaSMILO GRASSNaturalized
Stipa nelsonii var. doreiMOUNTAIN NEEDLE GRASSNative
Stipa nevadensisNEVADA NEEDLE GRASSNative
Stipa occidentalisNative
Stipa occidentalis var. californicaCALIFORNIA NEEDLE GRASSNative
Stipa occidentalis var. occidentalisWESTERN NEEDLE GRASSNative
Stipa occidentalis var. pubescensCOMMON WESTERN NEEDLE GRASSNative
Stipa parishii var. parishiiNative
Stipa pinetorumPINEWOODS NEEDLE GRASSNative
Stipa plumosa
(Under Stipa)
Mentioned in
a note
Stipa pulchraPURPLE NEEDLE GRASSNative
Stipa purpurataBRISTLY NEEDLE GRASSNaturalized
Stipa speciosaDESERT NEEDLE GRASSNative
Stipa stillmaniiSTILLMAN'S NEEDLE GRASSNative
Stipa tenacissima
(Under Stipa)
Mentioned in
a note
Stipa tenuissima
(Under Stipa)
Mentioned in
a note
Stipa thurberianaTHURBER'S NEEDLE GRASSNative
Stipa viridula
(Under Stipa)
Mentioned in
a note
Stipa webberiWEBBER'S NEEDLE GRASSNative
Streptanthella
Streptanthella longirostrisNative
Streptanthella longirostris var. derelicta
(Under Streptanthella longirostris)
Synonym
Streptanthus
  ↳  Key to Streptanthus
JEWELFLOWER
Streptanthus albidus subsp. albidus
(Under Streptanthus glandulosus subsp. albidus)
Synonym
Streptanthus albidus subsp. peramoenus
(Under Streptanthus glandulosus subsp. glandulosus)
Synonym
Streptanthus anceps
(Under Caulanthus anceps)
Synonym
Streptanthus barbatusNative
Streptanthus barbigerBEARDED JEWELFLOWERNative
Streptanthus batrachopusTAMALPAIS JEWELFLOWERNative
Streptanthus bernardinusLAGUNA MOUNTAINS JEWELFLOWERNative
Streptanthus brachiatusNative
Streptanthus brachiatus subsp. brachiatus
(Under Streptanthus brachiatus)
Synonym
Streptanthus brachiatus subsp. hoffmanii
(Under Streptanthus brachiatus)
Synonym
Streptanthus breweriNative
Streptanthus breweri var. breweri
(Under Streptanthus breweri)
Synonym
Streptanthus breweri var. hesperidis
(Under Streptanthus hesperidis)
Synonym
Streptanthus callistusMOUNT HAMILTON JEWELFLOWERNative
Streptanthus campestrisSOUTHERN JEWELFLOWERNative
Streptanthus cordatusNative
Streptanthus cordatus var. cordatusNative
Streptanthus cordatus var. duranii
(Under Streptanthus cordatus var. cordatus)
Synonym
Streptanthus cordatus var. exiguus
(Under Streptanthus oliganthus)
Synonym
Streptanthus cordatus var. piutensisPIUTE MOUNTAINS JEWELFLOWERNative
Streptanthus coulteri var. lemmonii
(Under Caulanthus lemmonii)
Synonym
Streptanthus diversifoliusVARIED-LEAVED JEWELFLOWERNative
Streptanthus drepanoidesSICKLE-FRUIT JEWELFLOWERNative
Streptanthus farnsworthianusFARNSWORTH'S JEWELFLOWERNative
Streptanthus fenestratusTEHIPITE VALLEY JEWELFLOWERNative
Streptanthus flavescens
(Under Caulanthus flavescens)
Synonym
Streptanthus glandulosusNative
Streptanthus glandulosus subsp. albidusMETCALF CANYON JEWELFLOWERNative
Streptanthus glandulosus subsp. arkii
(Under Streptanthus glandulosus subsp. glandulosus)
Synonym
Streptanthus glandulosus subsp. glandulosusNative
Streptanthus glandulosus subsp. hoffmaniiHOFFMAN'S BRISTLY JEWELFLOWERNative
Streptanthus glandulosus subsp. josephinensis
(Under Streptanthus glandulosus)
Mentioned in
a note
Streptanthus glandulosus subsp. nigerTIBURON JEWELFLOWERNative
Streptanthus glandulosus subsp. pulchellusMOUNT TAMALPAIS BRISTLY JEWELFLOWERNative
Streptanthus glandulosus subsp. raichei
(Under Streptanthus glandulosus subsp. glandulosus)
Synonym
Streptanthus glandulosus subsp. secundusNative
Streptanthus glandulosus subsp. sonomensisUNCOMMON JEWELFLOWERNative
Streptanthus glandulosus var. albidus
(Under Streptanthus glandulosus subsp. albidus)
Synonym
Streptanthus glandulosus var. hoffmanii
(Under Streptanthus glandulosus subsp. hoffmanii)
Synonym
Streptanthus glandulosus var. niger
(Under Streptanthus glandulosus subsp. niger)
Synonym
Streptanthus glandulosus var. pulchellus
(Under Streptanthus glandulosus subsp. pulchellus)
Synonym
Streptanthus glandulosus var. sonomensis
(Under Streptanthus glandulosus subsp. sonomensis)
Synonym
Streptanthus glaucus
(Under Caulanthus glaucus)
Synonym
Streptanthus gracilisALPINE JEWELFLOWERNative
Streptanthus hallii
(Under Caulanthus hallii)
Synonym
Streptanthus hesperidisNative
Streptanthus heterophyllus
(Under Caulanthus heterophyllus)
Synonym
Streptanthus hispidusMOUNT DIABLO JEWELFLOWERNative
Streptanthus howelliiHOWELL'S JEWELFLOWERNative
Streptanthus inflatus
(Under Caulanthus inflatus)
Synonym
Streptanthus insignisSAN BENITO JEWELFLOWERNative
Streptanthus insignis subsp. insignisNative
Streptanthus insignis subsp. lyoniiARBURUA RANCH JEWELFLOWERNative
Streptanthus longisiliquusLONG-FRUIT JEWELFLOWERNative
Streptanthus major
(Under Caulanthus major)
Synonym
Streptanthus morrisoniiNative
Streptanthus morrisonii subsp. elatus
(Under Streptanthus morrisonii)
Synonym
Streptanthus morrisonii subsp. hirtiflorus
(Under Streptanthus morrisonii)
Synonym
Streptanthus morrisonii subsp. morrisonii
(Under Streptanthus morrisonii)
Synonym
Streptanthus niger
(Under Streptanthus glandulosus subsp. niger)
Synonym
Streptanthus oblanceolatusTRINITY RIVER JEWELFLOWERNative
Streptanthus oliganthusMASONIC MOUNTAIN JEWELFLOWERNative
Streptanthus pilosus
(Under Caulanthus pilosus)
Synonym
Streptanthus polygaloidesMILKWORT JEWELFLOWERNative
Streptanthus simulans
(Under Caulanthus simulans)
Synonym
Streptanthus tortuosusMOUNTAIN JEWELFLOWERNative
Streptanthus tortuosus var. flavescens
(Under Streptanthus tortuosus)
Synonym
Streptanthus tortuosus var. foliosus
(Under Streptanthus tortuosus)
Synonym
Streptanthus tortuosus var. oblongus
(Under Streptanthus tortuosus)
Synonym
Streptanthus tortuosus var. optatus
(Under Streptanthus tortuosus)
Synonym
Streptanthus tortuosus var. orbiculatus
(Under Streptanthus tortuosus)
Synonym
Streptanthus tortuosus var. pallidus
(Under Streptanthus tortuosus)
Synonym
Streptanthus tortuosus var. suffrutescens
(Under Streptanthus tortuosus)
Synonym
Streptanthus tortuosus var. tortuosus
(Under Streptanthus tortuosus)
Synonym
Streptanthus vernalisEARLY JEWELFLOWERNative
Streptanthus vimineusNative
Streptopus
Streptopus amplexifolius var. americanusNative
Streptopus amplexifolius var. denticulatus
(Under Streptopus amplexifolius var. americanus)
Synonym
Strigosella
Strigosella africanaNaturalized
Stropholirion californicum
(Under Dichelostemma volubile)
Synonym
Struthiopteris
Struthiopteris spicantDEER FERNNative
Stuckenia
  ↳  Key to Stuckenia
PONDWEED
Stuckenia filiformis subsp. alpinaSLENDER-LEAVED PONDWEEDNative
Stuckenia filiformis subsp. filiformis
(Under Stuckenia filiformis subsp. alpina)
Mentioned in
a note
Stuckenia pectinataFENNEL-LEAF PONDWEEDNative
Stuckenia striataNEVADA PONDWEEDNative
Stutzia
Stutzia covilleiCOVILLE'S ORACHNative
Stylocline
  ↳  Key to Stylocline
NESTSTRAW
Stylocline amphibola
(Under Micropus amphibolus)
Synonym
Stylocline citroleumOIL NESTSTRAWNative
Stylocline filaginea
(Under Ancistrocarphus filagineus)
Synonym
Stylocline filaginea var. depressa
(Under Ancistrocarphus filagineus)
Synonym
Stylocline gnaphalioides
(Under Stylocline gnaphaloides)
Synonym
Stylocline gnaphaloidesEVERLASTING NESTSTRAWNative
Stylocline intertextaMOJAVE NESTSTRAWNative
Stylocline masoniiMASON'S NESTSTRAWNative
Stylocline micropoidesDESERT NESTSTRAW, WOOLLYHEAD FANBRACTNative
Stylocline psilocarphoidesPECK NESTSTRAWNative
Stylocline sonorensisMESQUITE NESTSTRAWNative
Stylomecon heterophylla
(Under Papaver heterophyllum)
Synonym
StyracaceaeSTORAX FAMILY
StyraxSNOWDROP BUSH
Styrax officinalis var. californicus
(Under Styrax redivivus)
Synonym
Styrax officinalis var. fulvescens
(Under Styrax redivivus)
Synonym
Styrax officinalis var. redivivus
(Under Styrax redivivus)
Synonym
Styrax redivivusNative
Suaeda
  ↳  Key to Suaeda
SEABLITE, SEEPWEED
Suaeda calceoliformisHORNED SEABLITENative
Suaeda californicaCALIFORNIA SEABLITENative
Suaeda californica var. pubescens
(Under Suaeda taxifolia)
Synonym
Suaeda californica var. taxifolia
(Under Suaeda taxifolia)
Synonym
Suaeda depressa var. depressa
(Under Suaeda calceoliformis)
Synonym
Suaeda depressa var. erecta
(Under Suaeda calceoliformis)
Synonym
Suaeda esteroaESTUARY SEABLITENative
Suaeda fruticosa
(Under Suaeda nigra)
Synonym
Suaeda moquinii
(Under Suaeda nigra)
Synonym
Suaeda nigraBUSH SEEPWEEDNative
Suaeda occidentalisWESTERN SEABLITENative
Suaeda taxifoliaWOOLLY SEABLITENative
Suaeda torreyana var. ramosissima
(Under Suaeda nigra)
Synonym
Suaeda torreyana var. torreyana
(Under Suaeda nigra)
Synonym
SubulariaAWLWORT
Subularia aquatica subsp. americanaWATER AWLWORTNative
Subularia aquatica var. americana
(Under Subularia aquatica subsp. americana)
Synonym
Suksdorfia ranunculifolia
(Under Hemieva ranunculifolia)
Synonym
Suksdorfia ranunculifolia
(Under Saxifragaceae)
Mentioned in
a note
Swallenia
Swallenia alexandraeEUREKA VALLEY DUNE GRASSNative
Swertia
Swertia albicaulis
(Under Frasera albicaulis)
Synonym
Swertia albicaulis var. albicaulis
(Under Frasera albicaulis var. modocensis)
Synonym
Swertia albicaulis var. nitida
(Under Frasera albicaulis var. nitida)
Synonym
Swertia albomarginata
(Under Frasera albomarginata)
Synonym
Swertia covillei
(Under Swertia perennis)
Synonym
Swertia fastigiata
(Under Frasera umpquaensis)
Mentioned in
a note
Swertia lassenica
(Under Frasera albicaulis var. nitida)
Synonym
Swertia modocensis
(Under Frasera albicaulis var. modocensis)
Synonym
Swertia neglecta
(Under Frasera neglecta)
Synonym
Swertia parryi
(Under Frasera parryi)
Synonym
Swertia perennisSTAR SWERTIANative
Swertia puberulenta
(Under Frasera puberulenta)
Synonym
Swertia radiata
(Under Frasera speciosa)
Synonym
Swertia radiata var. radiata
(Under Frasera speciosa)
Synonym
Swertia shastaensis
(Under Frasera albicaulis var. modocensis)
Synonym
Swertia tubulosa
(Under Frasera tubulosa)
Synonym
Swertia umpquaensis
(Under Frasera umpquaensis)
Synonym
Syagrus
Syagrus romanzoffianaQUEEN PALMWaif
Sympetaleia rupestris
(Under Eucnide rupestris)
Synonym
Symphoricarpos
  ↳  Key to Symphoricarpos
WAXBERRY, SNOWBERRY
Symphoricarpos acutus
(Under Symphoricarpos mollis)
Synonym
Symphoricarpos albus var. laevigatusSNOWBERRYNative
Symphoricarpos hesperius
(Under Symphoricarpos mollis)
Synonym
Symphoricarpos longiflorusFRAGRANT SNOWBERRYNative
Symphoricarpos mollisCREEPING SNOWBERRY, TRIP VINENative
Symphoricarpos parishii
(Under Symphoricarpos rotundifolius var. parishii)
Synonym
Symphoricarpos rivularis
(Under Symphoricarpos albus var. laevigatus)
Synonym
Symphoricarpos rotundifoliusNative
Symphoricarpos rotundifolius var. parishiiNative
Symphoricarpos rotundifolius var. rotundifoliusNative
Symphyotrichum
  ↳  Key to Symphyotrichum
AMERICAN-ASTER
Symphyotrichum ascendensNative
Symphyotrichum bracteolatumNative
Symphyotrichum campestreNative
Symphyotrichum campestre var. bloomeri
(Under Symphyotrichum campestre)
Synonym
Symphyotrichum campestre var. campestre
(Under Symphyotrichum campestre)
Synonym
Symphyotrichum chilenseNative
Symphyotrichum chilense var. chilense
(Under Symphyotrichum chilense)
Synonym
Symphyotrichum chilense var. invenustum
(Under Symphyotrichum chilense)
Synonym
Symphyotrichum chilense var. medium
(Under Symphyotrichum chilense)
Synonym
Symphyotrichum defoliatumSAN BERNARDINO ASTERNative
Symphyotrichum eatonii
(Under Symphyotrichum bracteolatum)
Synonym
Symphyotrichum expansum
(Under Symphyotrichum subulatum var. parviflorum)
Synonym
Symphyotrichum foliaceumNative
Symphyotrichum foliaceum var. apricumNative
Symphyotrichum foliaceum var. parryiNative
Symphyotrichum frondosumNative
Symphyotrichum greataeGREATA'S ASTERNative
Symphyotrichum hallii
(Under Symphyotrichum bracteolatum)
Mentioned in
a note
Symphyotrichum hendersoniiHENDERSON'S ASTERNative
Symphyotrichum laeve var. geyeri
(Under Symphyotrichum)
Mentioned in
a note
Symphyotrichum lanceolatum subsp. hesperium
(Under Symphyotrichum lanceolatum var. hesperium)
Synonym
Symphyotrichum lanceolatum var. hesperiumNative
Symphyotrichum lentumSUISUN MARSH ASTERNative
Symphyotrichum spathulatumNative
Symphyotrichum spathulatum var. intermediumNative
Symphyotrichum spathulatum var. spathulatumNative
Symphyotrichum spathulatum var. yosemitanumWESTERN BOG ASTERNative
Symphyotrichum subspicatumDOUGLAS ASTERNative
Symphyotrichum subulatumANNUAL SALTMARSH ASTERNative
Symphyotrichum subulatum var. elongatumNaturalized
Symphyotrichum subulatum var. parviflorumNative
Symphyotrichum subulatum var. squamatumNaturalized
Symphytotrichum subulatum var. ligulatum
(Under Symphyotrichum subulatum)
Mentioned in
a note
Symphytum
  ↳  Key to Symphytum
COMFREY
Symphytum ×uplandicumRUSSIAN COMFREYNaturalized
Symphytum asperum
(Under Symphytum ×uplandicum)
Synonym
Symphytum officinaleCOMFREYWaif
Synthyris
  ↳  Key to Synthyris
Synthyris cordataSERPENTINE SNOW QUEENNative
Synthyris major
(Under Synthyris missurica subsp. missurica)
Synonym
Synthyris missurica subsp. missuricaKITTENTAILNative
Synthyris reniformisSNOW QUEENNative
Synthyris reniformis var. cordata
(Under Synthyris cordata)
Synonym
Synthyris reniformis var. reniformis
(Under Synthyris reniformis)
Synonym
Synthyris stellata
(Under Synthyris missurica subsp. missurica)
Synonym
Syntrichopappus
  ↳  Key to Syntrichopappus
Syntrichopappus fremontiiNative
Syntrichopappus lemmoniiLEMMON'S SYNTRICHOPAPPUSNative
Systenotheca
Systenotheca vortriedeiVORTRIEDE'S SPINEFLOWERNative
Syzygium
Syzygium aromaticum
(Under Myrtaceae)
Mentioned in
a note
Syzygium australeSCRUB CHERRYWaif
Syzygium paniculatum
(Under Syzygium australe)
Mentioned in
a note