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    Indexes to accepted names and synonyms:
    (synonyms indicated with asterisks)
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Saccharum ravennae
Sagina apetala
Sagina apetala var. barbata* (under Sagina apetala)
Sagina decumbens subsp. occidentalis
Sagina maxima subsp. crassicaulis
Sagina procumbens
Sagina saginoides
Sagina subulata
Sagittaria cuneata
Sagittaria latifolia
Sagittaria longiloba
Sagittaria montevidensis subsp. calycina
Sagittaria rigida
Sagittaria sanfordii
Salazaria mexicana* (under Scutellaria mexicana)
Salicornia bigelovii
Salicornia depressa
Salicornia europaea* (under Salicornia depressa)
Salicornia pacifica
Salicornia perennis
Salicornia rubra
Salicornia subterminalis* (under Arthrocnemum subterminale)
Salicornia utahensis* (under Salicornia pacifica)
Salicornia virginica* (under Salicornia pacifica)
Salix alba
Salix alba var. vitellina* (under Salix alba)
Salix arctica subsp. petraea* (under Salix petrophila)
Salix arctica* (under Salix petrophila)
Salix babylonica
Salix bebbiana
Salix bonplandiana var. laevigata* (under Salix laevigata)
Salix boothii
Salix brachycarpa subsp. brachycarpa* (under Salix brachycarpa var. brachycarpa)
Salix brachycarpa var. brachycarpa
Salix breweri
Salix delnortensis
Salix drummondiana
Salix eastwoodiae
Salix eriocephala subsp. mackenzieana* (under Salix prolixa)
Salix eriocephala var. ligulifolia* (under Salix ligulifolia)
Salix eriocephala var. watsonii* (under Salix lutea)
Salix exigua
Salix exigua var. exigua
Salix exigua var. hindsiana
Salix exigua var. nevadensis* (under Salix exigua var. exigua)
Salix exigua var. stenophylla* (under Salix exigua var. exigua)
Salix geyeriana
Salix gooddingii
Salix hindsiana var. leucodendroides* (under Salix exigua var. hindsiana)
Salix hindsiana var. parishiana* (under Salix exigua var. hindsiana)
Salix hindsiana* (under Salix exigua var. hindsiana)
Salix hookeriana
Salix jepsonii
Salix laevigata
Salix lasiandra
Salix lasiandra var. caudata
Salix lasiandra var. lasiandra
Salix lasiolepis
Salix lasiolepis var. bigelovii* (under Salix lasiolepis)
Salix lemmonii
Salix ligulifolia
Salix lucida subsp. caudata* (under Salix lasiandra var. caudata)
Salix lucida subsp. lasiandra* (under Salix lasiandra var. lasiandra)
Salix lutea
Salix melanopsis
Salix myrtillifolia* (under Salix boothii)
Salix nivalis
Salix orestera
Salix petrophila
Salix phylicifolia var. monica* (under Salix planifolia)
Salix planifolia
Salix planifolia subsp. planifolia* (under Salix planifolia)
Salix prolixa
Salix pseudocordata* (under Salix boothii)
Salix purpurea
Salix reticulata subsp. nivalis* (under Salix nivalis)
Salix scouleriana
Salix sessilifolia* (under Salix)
Salix sitchensis
Salix tracyi
Salpichroa origanifolia
Salsola atriplicifolia* (under Cycloloma atriplicifolium)
Salsola australis
Salsola damascena
Salsola gobicola
Salsola iberica* (under Salsola tragus)
Salsola kali subsp. pontica* (under Salsola australis)
Salsola kali var. tenuifolia* (under Salsola australis) (under Salsola tragus)
Salsola paulsenii
Salsola paulsenii* (under Salsola gobicola)
Salsola pestifer* (under Salsola tragus)
Salsola ryanii
Salsola soda
Salsola tragus
Salsola tragus* (under Salsola australis) (under Salsola gobicola)
Salsola vermiculata* (under Salsola damascena)
Saltugilia australis
Saltugilia caruifolia
Saltugilia grinnellii* (under Saltugilia splendens)
Saltugilia latimeri
Saltugilia splendens
Saltugilia splendens subsp. grantii
Saltugilia splendens subsp. splendens
Salvia aethiopis
Salvia apiana
Salvia brandegeei
Salvia brandegei* (under Salvia brandegeei)
Salvia carduacea
Salvia carnosa subsp. gilmanii* (under Salvia dorrii var. dorrii)
Salvia clevelandii
Salvia columbariae
Salvia columbariae var. ziegleri* (under Salvia columbariae)
Salvia dorrii
Salvia dorrii subsp. argentea* (under Salvia dorrii var. dorrii)
Salvia dorrii subsp. carnosa* (under Salvia dorrii var. incana)
Salvia dorrii subsp. gilmanii* (under Salvia dorrii var. dorrii)
Salvia dorrii var. carnosa* (under Salvia dorrii var. incana)
Salvia dorrii var. dorrii
Salvia dorrii var. incana
Salvia dorrii var. pilosa
Salvia eremostachya
Salvia funerea
Salvia funerea var. fornacis* (under Salvia funerea)
Salvia greatae
Salvia leucophylla
Salvia mellifera
Salvia mohavensis
Salvia munzii
Salvia pachyphylla
Salvia sonomensis
Salvia spathacea
Salvia vaseyi
Salvia verbenacea* (under Salvia)
Salvia virgata
Salvinia minima
Salvinia molesta
Salvinia oblongifolia
Sambucus melanocarpa* (under Sambucus racemosa var. melanocarpa)
Sambucus mexicana* (under Sambucus nigra subsp. caerulea)
Sambucus nigra subsp. caerulea
Sambucus racemosa
Sambucus racemosa var. melanocarpa
Sambucus racemosa var. microbotrys* (under Sambucus racemosa var. racemosa)
Sambucus racemosa var. racemosa
Samolus floribundus* (under Samolus parviflorus)
Samolus parviflorus
Sanguisorba minor subsp. muricata* (under Poterium sanguisorba)
Sanguisorba occidentalis* (under Poteridium annuum)
Sanguisorba officinalis
Sanicula arctopoides
Sanicula arguta
Sanicula bipinnata
Sanicula bipinnatifida
Sanicula crassicaulis
Sanicula graveolens
Sanicula hoffmannii
Sanicula laciniata
Sanicula maritima
Sanicula peckiana
Sanicula saxatilis
Sanicula simulans* (under Sanicula arguta)
Sanicula tracyi
Sanicula tuberosa
Santolina chamaecyparissus
Sanvitalia abertii
Sapium sebiferum* (under Triadica sebifera)
Saponaria officinalis
Sarcobatus baileyi
Sarcobatus maximillianii* (under Sarcobatus vermiculatus)
Sarcobatus vermiculatus
Sarcobatus vermiculatus var. baileyi* (under Sarcobatus baileyi)
Sarcocornia pacifica* (under Salicornia pacifica)
Sarcocornia perennis* (under Salicornia perennis)
Sarcodes sanguinea
Sarcostemma crispum* (under Funastrum crispum)
Sarcostemma cynanchoides subsp. hartwegii* (under Funastrum cynanchoides var. hartwegii)
Sarcostemma hirtellum* (under Funastrum hirtellum)
Sarracenia purpurea
Satureja chandleri* (under Clinopodium chandleri)
Satureja douglasii* (under Clinopodium douglasii)
Satureja mimuloides* (under Clinopodium mimuloides)
Saussurea americana
Saxifraga aprica* (under Micranthes aprica)
Saxifraga bryophora* (under Micranthes bryophora)
Saxifraga californica* (under Micranthes californica)
Saxifraga cespitosa
Saxifraga ferruginea* (under Micranthes ferruginea)
Saxifraga howellii* (under Micranthes howellii)
Saxifraga hyperborea
Saxifraga integrifolia* (under Micranthes integrifolia)
Saxifraga marshallii* (under Micranthes marshallii)
Saxifraga mertensiana
Saxifraga nidifica var. claytoniifolia* (under Micranthes fragosa)
Saxifraga nidifica var. nidifica* (under Micranthes nidifica)
Saxifraga nuttallii* (under Cascadia nuttallii)
Saxifraga odontoloma* (under Micranthes odontoloma)
Saxifraga oregana* (under Micranthes oregana)
Saxifraga rivularis* (under Saxifraga hyperborea)
Saxifraga rufidula* (under Micranthes marshallii)
Saxifraga stolonifera* (under Saxifraga)
Saxifraga tolmiei* (under Micranthes tolmiei)
Saxifragopsis fragarioides
Scabiosa atropurpurea
Scabiosa stellata
Scandix pecten-veneris
Sceptridium multifidum
Schedonorus arundinaceus* (under Festuca arundinacea)
Schedonorus phoenix* (under Festuca arundinacea)
Schedonorus pratensis* (under Festuca pratensis)
Scheuchzeria palustris
Scheuchzeria palustris subsp. americana* (under Scheuchzeria palustris)
Schinus molle
Schinus polygamus
Schinus terebinthifolius
Schismus arabicus
Schismus barbatus
Schizachyrium scoparium* (under Poaceae)
Schkuhria multiflora var. multiflora* (under Bahia neomexicana)
Schoenoplectus acutus var. occidentalis
Schoenoplectus americanus
Schoenoplectus californicus
Schoenoplectus fluviatilis* (under Bolboschoenus fluviatilis)
Schoenoplectus glaucus* (under Bolboschoenus glaucus)
Schoenoplectus heterochaetus
Schoenoplectus mucronatus
Schoenoplectus pungens var. longispicatus
Schoenoplectus robustus* (under Bolboschoenus robustus)
Schoenoplectus saximontanus
Schoenoplectus subterminalis
Schoenoplectus tabernaemontani
Schoenoplectus triqueter
Schoenus nigricans
Scirpus acutus var. occidentalis* (under Schoenoplectus acutus var. occidentalis)
Scirpus americanus var. longispicatus* (under Schoenoplectus pungens var. longispicatus)
Scirpus americanus* (under Schoenoplectus americanus)
Scirpus californicus* (under Schoenoplectus californicus)
Scirpus cernuus* (under Isolepis cernua)
Scirpus clementis* (under Trichophorum clementis)
Scirpus congdonii
Scirpus cyperinus
Scirpus diffusus
Scirpus fluviatilis* (under Bolboschoenus fluviatilis)
Scirpus heterochaetus* (under Schoenoplectus heterochaetus)
Scirpus koilolepis* (under Isolepis carinata)
Scirpus maritimus var. paludosus* (under Bolboschoenus maritimus subsp. paludosus)
Scirpus maritimus* (under Bolboschoenus maritimus subsp. paludosus)
Scirpus microcarpus
Scirpus mucronatus* (under Schoenoplectus mucronatus)
Scirpus nevadensis* (under Amphiscirpus nevadensis)
Scirpus pendulus
Scirpus pumilus* (under Trichophorum pumilum)
Scirpus pungens* (under Schoenoplectus pungens var. longispicatus)
Scirpus robustus* (under Bolboschoenus robustus)
Scirpus saximontanus* (under Schoenoplectus saximontanus)
Scirpus setaceus* (under Isolepis setacea)
Scirpus subterminalis* (under Schoenoplectus subterminalis)
Scirpus tabernaemontani* (under Schoenoplectus tabernaemontani)
Scirpus tenuis* (under Eleocharis tenuis var. tenuis)
Scirpus triqueter* (under Schoenoplectus triqueter)
Scirpus tuberosus* (under Bolboschoenus glaucus)
Scleranthus annuus subsp. annuus
Sclerocactus johnsonii
Sclerocactus polyancistrus
Sclerochloa dura
Sclerolinon digynum
Scleropogon brevifolius
Scoliopus bigelovii
Scolymus hispanicus
Scopulophila rixfordii
Scorzonera hispanica
Scribneria bolanderi
Scrophularia atrata
Scrophularia californica
Scrophularia californica subsp. californica* (under Scrophularia californica)
Scrophularia californica subsp. floribunda* (under Scrophularia californica)
Scrophularia desertorum
Scrophularia lanceolata
Scrophularia peregrina
Scrophularia villosa
Scutellaria angustifolia var. canescens* (under Scutellaria siphocampyloides)
Scutellaria antirrhinoides
Scutellaria austiniae* (under Scutellaria siphocampyloides)
Scutellaria bolanderi
Scutellaria bolanderi subsp. austromontana
Scutellaria bolanderi subsp. bolanderi
Scutellaria californica
Scutellaria galericulata
Scutellaria holmgreniorum* (under Scutellaria nana)
Scutellaria lateriflora
Scutellaria linearifolia* (under Scutellaria siphocampyloides)
Scutellaria mexicana
Scutellaria nana
Scutellaria pilosiuscula* (under Scutellaria tuberosa)
Scutellaria sanhedrinsis* (under Scutellaria antirrhinoides)
Scutellaria siphocampyloides
Scutellaria tuberosa
Scutellaria tuberosa subsp. similis* (under Scutellaria tuberosa)
Scutellaria viarum* (under Scutellaria antirrhinoides)
Searsia lancea
Secale cereale
Securigera varia* (under Coronilla varia)
Sedella congdonii* (under Sedella pumila)
Sedella leiocarpa
Sedella pentandra
Sedella pumila
Sedum albomarginatum
Sedum album
Sedum dendroideum subsp. praealtum* (under Sedum praealtum)
Sedum divergens
Sedum eastwoodiae* (under Sedum laxum subsp. eastwoodiae)
Sedum lanceolatum
Sedum lanceolatum var. subalpinum* (under Sedum lanceolatum)
Sedum laxum
Sedum laxum subsp. eastwoodiae
Sedum laxum subsp. flavidum
Sedum laxum subsp. heckneri
Sedum laxum subsp. laxum
Sedum laxum subsp. retusum* (under Sedum obtusatum subsp. retusum)
Sedum laxum var. eastwoodiae* (under Sedum laxum subsp. eastwoodiae)
Sedum laxum var. flavidum* (under Sedum laxum subsp. flavidum)
Sedum laxum var. heckneri* (under Sedum laxum subsp. heckneri)
Sedum laxum var. latifolium* (under Sedum laxum subsp. laxum)
Sedum laxum var. laxum* (under Sedum laxum subsp. laxum)
Sedum niveum
Sedum oblanceolatum
Sedum obtusatum
Sedum obtusatum subsp. boreale
Sedum obtusatum subsp. obtusatum
Sedum obtusatum subsp. paradisum
Sedum obtusatum subsp. retusum
Sedum obtusatum var. boreale* (under Sedum obtusatum subsp. boreale)
Sedum obtusatum var. obtusatum* (under Sedum obtusatum subsp. obtusatum)
Sedum obtusatum var. paradisum* (under Sedum obtusatum subsp. paradisum)
Sedum obtusatum var. retusum* (under Sedum obtusatum subsp. retusum)
Sedum oreganum
Sedum oregonense
Sedum paradisum* (under Sedum obtusatum subsp. paradisum)
Sedum praealtum
Sedum radiatum
Sedum radiatum var. depauperatum* (under Sedum radiatum)
Sedum rosea subsp. integrifolium* (under Rhodiola integrifolia subsp. integrifolia)
Sedum roseum subsp. integrifolium* (under Rhodiola integrifolia subsp. integrifolia)
Sedum spathulifolium
Sedum spathulifolium var. pruinosum* (under Sedum spathulifolium)
Sedum stenopetalum
Sedum stenopetalum subsp. radiatum* (under Sedum radiatum)
Sedum stenopetalum var. monanthum* (under Sedum stenopetalum)
Selaginella asprella
Selaginella bigelovii
Selaginella cinerascens
Selaginella densa var. scopulorum* (under Selaginella scopulorum)
Selaginella eremophila
Selaginella hansenii
Selaginella leucobryoides
Selaginella oregana
Selaginella scopulorum
Selaginella wallacei
Selaginella watsonii
Selinocarpus nevadensis* (under Acleisanthes nevadensis)
Senecio aphanactis
Senecio aronicoides
Senecio astephanus
Senecio bernardinus* (under Packera bernardina)
Senecio blochmaniae
Senecio bolanderi var. bolanderi* (under Packera bolanderi var. bolanderi)
Senecio bolanderi* (under Packera bolanderi var. bolanderi)
Senecio breweri* (under Packera breweri)
Senecio californicus
Senecio canus* (under Packera cana)
Senecio clarkianus
Senecio clevelandii* (under Packera clevelandii)
Senecio cymbalarioides* (under Packera subnuda var. subnuda)
Senecio elegans
Senecio eurycephalus var. eurycephalus* (under Packera eurycephala var. eurycephala)
Senecio eurycephalus var. lewisrosei* (under Packera eurycephala var. lewisrosei)
Senecio eurycephalus* (under Packera eurycephala var. eurycephala)
Senecio flaccidus
Senecio flaccidus var. douglasii
Senecio flaccidus var. monoensis
Senecio fremontii
Senecio fremontii var. fremontii
Senecio fremontii var. occidentalis
Senecio ganderi* (under Packera ganderi)
Senecio glomeratus
Senecio greenei* (under Packera greenei)
Senecio hesperius* (under Packera hesperia)
Senecio hybridus* (under Senecio)
Senecio hydrophiloides
Senecio hydrophilus
Senecio indecorus* (under Packera indecora)
Senecio integerrimus
Senecio integerrimus var. exaltatus
Senecio integerrimus var. major
Senecio integerrimus var. ochroleucus
Senecio ionophyllus* (under Packera ionophylla)
Senecio jacobaea
Senecio layneae* (under Packera layneae)
Senecio linearifolius var. linearifolius
Senecio lyonii
Senecio macounii* (under Packera macounii)
Senecio mikanioides* (under Delairea odorata)
Senecio minimus
Senecio mohavensis
Senecio multilobatus* (under Packera multilobata)
Senecio pattersonensis
Senecio pauciflorus* (under Packera pauciflora)
Senecio pseudaureus var. pseudaureus* (under Packera pseudaurea var. pseudaurea)
Senecio quadridentatus
Senecio scorzonella
Senecio serra var. serra
Senecio spartioides
Senecio spartioides var. multicapitatus* (under Senecio spartioides)
Senecio streptanthifolius* (under Packera streptanthifolia var. streptanthifolia)
Senecio sylvaticus
Senecio triangularis
Senecio vulgaris
Senecio werneriifolius* (under Packera werneriifolia)
Senegalia greggii
Senna armata
Senna artemisioides
Senna covesii
Senna didymobotrya
Senna marilandica
Senna multiglandulosa
Septimia multicava* (under Crassula multicava subsp. multicava)
Sequoia sempervirens
Sequoiadendron giganteum
Sericocarpus oregonensis
Sericocarpus oregonensis subsp. californicus
Sericocarpus oregonensis subsp. oregonensis
Sericocarpus oregonensis var. californicus* (under Sericocarpus oregonensis subsp. californicus)
Sericocarpus oregonensis var. oregonensis* (under Sericocarpus oregonensis subsp. oregonensis)
Sericocarpus tomentellus* (under Eucephalus tomentellus)
Sesbania exaltata* (under Sesbania herbacea)
Sesbania herbacea
Sesbania punicea
Sesbania tripetii* (under Sesbania punicea)
Sesuvium verrucosum
Setaria adhaerens
Setaria carnei* (under Setaria verticillata)
Setaria faberi
Setaria geniculata* (under Setaria parviflora)
Setaria glauca* (under Setaria pumila subsp. pumila)
Setaria gracilis* (under Setaria parviflora)
Setaria lutescens* (under Setaria pumila subsp. pumila)
Setaria parviflora
Setaria pumila subsp. pumila
Setaria sphacelata
Setaria verticillata
Setaria viridis
Shepherdia argentea
Shepherdia canadensis
Sherardia arvensis
Sibara deserti
Sibara filifolia
Sibara rosulata* (under Sibara deserti)
Sibara virginica* (under Planodes virginicum)
Sibaropsis hammittii
Sibbaldia procumbens
Sida rhombifolia
Sida spinosa
Sidalcea asprella
Sidalcea asprella subsp. asprella
Sidalcea asprella subsp. nana
Sidalcea calycosa
Sidalcea calycosa subsp. calycosa
Sidalcea calycosa subsp. rhizomata
Sidalcea celata
Sidalcea covillei
Sidalcea diploscypha
Sidalcea elegans
Sidalcea gigantea
Sidalcea glaucescens
Sidalcea hartwegii
Sidalcea hickmanii
Sidalcea hickmanii subsp. anomala
Sidalcea hickmanii subsp. hickmanii
Sidalcea hickmanii subsp. napensis
Sidalcea hickmanii subsp. parishii
Sidalcea hickmanii subsp. pillsburiensis
Sidalcea hickmanii subsp. viridis
Sidalcea hirsuta
Sidalcea keckii
Sidalcea malachroides
Sidalcea malviflora
Sidalcea malviflora subsp. asprella* (under Sidalcea asprella) (under Sidalcea asprella subsp. asprella)
Sidalcea malviflora subsp. californica
Sidalcea malviflora subsp. celata* (under Sidalcea celata)
Sidalcea malviflora subsp. dolosa
Sidalcea malviflora subsp. laciniata
Sidalcea malviflora subsp. malviflora
Sidalcea malviflora subsp. nana* (under Sidalcea asprella subsp. nana)
Sidalcea malviflora subsp. patula
Sidalcea malviflora subsp. purpurea
Sidalcea malviflora subsp. rostrata
Sidalcea malviflora subsp. sparsifolia* (under Sidalcea sparsifolia)
Sidalcea multifida
Sidalcea neomexicana
Sidalcea oregana
Sidalcea oregana subsp. eximia
Sidalcea oregana subsp. hydrophila
Sidalcea oregana subsp. oregana
Sidalcea oregana subsp. spicata
Sidalcea oregana subsp. valida
Sidalcea pedata
Sidalcea ranunculacea
Sidalcea reptans
Sidalcea robusta
Sidalcea setosa
Sidalcea sparsifolia
Sidalcea stipularis
Sidotheca caryophylloides
Sidotheca emarginata
Sidotheca trilobata
Silene antirrhina
Silene aperta
Silene armeria
Silene bernardina
Silene bolanderi
Silene bridgesii
Silene californica* (under Silene laciniata subsp. californica)
Silene campanulata
Silene campanulata subsp. campanulata
Silene campanulata subsp. glandulosa
Silene coniflora
Silene conoidea
Silene coronaria* (under Lychnis coronaria)
Silene dichotoma subsp. dichotoma
Silene douglasii var. douglasii
Silene gallica
Silene grayi
Silene hookeri
Silene hookeri subsp. bolanderi* (under Silene bolanderi)
Silene hookeri subsp. pulverulenta* (under Silene hookeri)
Silene invisa
Silene laciniata
Silene laciniata subsp. brandegeei* (under Silene laciniata subsp. laciniata)
Silene laciniata subsp. californica
Silene laciniata subsp. laciniata
Silene laciniata subsp. major* (under Silene laciniata subsp. laciniata)
Silene laciniata var. angustifolia* (under Silene laciniata subsp. laciniata)
Silene laciniata var. latifolia* (under Silene laciniata subsp. laciniata)
Silene latifolia
Silene latifolia subsp. alba* (under Silene latifolia)
Silene lemmonii
Silene marmorensis
Silene menziesii
Silene multinervia* (under Silene coniflora)
Silene noctiflora
Silene nuda
Silene occidentalis
Silene occidentalis subsp. longistipitata* (under Silene occidentalis)
Silene occidentalis subsp. occidentalis* (under Silene occidentalis)
Silene oregana
Silene parishii
Silene pendula
Silene pseudatocion
Silene salmonacea
Silene sargentii
Silene scouleri subsp. grandis* (under Silene scouleri subsp. scouleri)
Silene scouleri subsp. scouleri
Silene serpentinicola
Silene suksdorfii
Silene verecunda
Silene verecunda subsp. andersonii* (under Silene verecunda)
Silene verecunda subsp. platyota* (under Silene verecunda)
Silene verecunda subsp. verecunda* (under Silene verecunda)
Silene verecunda var. eglandulosa* (under Silene verecunda)
Silene vulgaris
Silybum marianum
Simmondsia chinensis
Sinapis alba
Sinapis arvensis
Sisymbrium altissimum
Sisymbrium erysimoides
Sisymbrium irio
Sisymbrium loeselii
Sisymbrium officinale
Sisymbrium orientale
Sisyrinchium bellum
Sisyrinchium californicum
Sisyrinchium douglasii var. douglasii* (under Olsynium douglasii var. douglasii)
Sisyrinchium elmeri
Sisyrinchium funereum
Sisyrinchium halophilum
Sisyrinchium hitchcockii
Sisyrinchium idahoense
Sisyrinchium idahoense var. idahoense
Sisyrinchium idahoense var. occidentale
Sisyrinchium longipes
Sitanion hystrix var. californicum* (under Elymus elymoides var. californicus)
Sitanion hystrix var. hystrix* (under Elymus elymoides var. elymoides)
Sitanion hystrix* (under Elymus elymoides)
Sitanion jubatum* (under Elymus multisetus)
Sitanion longifolium* (under Elymus elymoides var. brevifolius)
Sium suave
Smelowskia ovalis
Smelowskia ovalis var. congesta* (under Smelowskia ovalis)
Smilacina racemosa* (under Maianthemum racemosum)
Smilacina stellata* (under Maianthemum stellatum)
Smilax californica
Smilax jamesii
Solanum americanum
Solanum aviculare
Solanum carolinense
Solanum dimidiatum
Solanum douglasii
Solanum dulcamara
Solanum elaeagnifolium
Solanum furcatum
Solanum lanceolatum
Solanum marginatum
Solanum mauritianum* (under Solanum aviculare)
Solanum nigrum
Solanum parishii
Solanum peruvianum* (under Lycopersicon peruvianum)
Solanum physalifolium var. nitidibaccatum
Solanum rostratum
Solanum sarrachoides* (under Solanum physalifolium var. nitidibaccatum)
Solanum sisymbriifolium
Solanum triflorum
Solanum umbelliferum
Solanum wallacei
Solanum xanti
Soleirolia soleirolii
Solidago altissima subsp. altissima
Solidago altissima var. altissima* (under Solidago altissima subsp. altissima)
Solidago californica* (under Solidago velutina subsp. californica)
Solidago canadensis subsp. elongata* (under Solidago elongata)
Solidago canadensis var. elongata* (under Solidago elongata)
Solidago canadensis var. salebrosa* (under Solidago lepida var. salebrosa)
Solidago confinis
Solidago confinis var. spectabilis* (under Solidago spectabilis)
Solidago elongata
Solidago gigantea* (under Solidago lepida var. salebrosa)
Solidago guiradonis
Solidago lepida var. salebrosa
Solidago missouriensis* (under Solidago spectabilis)
Solidago multiradiata
Solidago sparsiflora* (under Solidago velutina subsp. sparsiflora)
Solidago spathulata
Solidago spectabilis
Solidago velutina
Solidago velutina subsp. californica
Solidago velutina subsp. sparsiflora
Soliva sessilis
Sollya heterophylla* (under Billardiera heterophylla)
Sonchus arvensis
Sonchus arvensis subsp. arvensis
Sonchus arvensis subsp. uliginosus
Sonchus asper subsp. asper
Sonchus oleraceus
Sonchus tenerrimus
Sophora secundiflora* (under Calia secundiflora)
Sorbus aucuparia
Sorbus californica
Sorbus scopulina
Sorbus scopulina var. cascadensis* (under Sorbus scopulina)
Sorbus scopulina var. scopulina* (under Sorbus scopulina)
Sorbus sitchensis
Sorbus sitchensis var. grayi
Sorbus sitchensis var. sitchensis
Sorghum bicolor
Sorghum halepense
Sparaxis grandiflora
Sparaxis tricolor
Sparganium angustifolium
Sparganium angustifolium subsp. emersum* (under Sparganium emersum)
Sparganium angustifolium var. multipedunculatum* (under Sparganium angustifolium)
Sparganium chlorocarpum var. acaule* (under Sparganium emersum)
Sparganium chlorocarpum* (under Sparganium emersum)
Sparganium emersum
Sparganium emersum subsp. acaule* (under Sparganium emersum)
Sparganium emersum var. multipedunculatum* (under Sparganium angustifolium)
Sparganium erectum subsp. stoloniferum* (under Sparganium eurycarpum var. greenei)
Sparganium eurycarpum
Sparganium eurycarpum subsp. eurycarpum* (under Sparganium eurycarpum var. eurycarpum)
Sparganium eurycarpum var. eurycarpum
Sparganium eurycarpum var. greenei
Sparganium greenei* (under Sparganium eurycarpum var. greenei)
Sparganium minimum* (under Sparganium natans)
Sparganium multipedunculatum* (under Sparganium angustifolium)
Sparganium natans
Sparganium simplex var. multipedunculatum* (under Sparganium angustifolium)
Spartina alterniflora
Spartina densiflora
Spartina foliosa
Spartina gracilis
Spartina patens
Spartium junceum
Spergula arvensis
Spergularia atrosperma
Spergularia bocconei* (under Spergularia bocconi)
Spergularia bocconi
Spergularia canadensis var. occidentalis
Spergularia macrotheca
Spergularia macrotheca var. leucantha
Spergularia macrotheca var. longistyla
Spergularia macrotheca var. macrotheca
Spergularia marina
Spergularia marina var. tenuis* (under Spergularia marina)
Spergularia maritima* (under Spergularia media var. media)
Spergularia media var. media
Spergularia platensis var. platensis
Spergularia rubra
Spergularia salina* (under Spergularia marina)
Spergularia villosa
Spermolepis echinata
Sphaeralcea ambigua
Sphaeralcea ambigua var. ambigua
Sphaeralcea ambigua var. rosacea
Sphaeralcea ambigua var. rugosa
Sphaeralcea angustifolia
Sphaeralcea coulteri
Sphaeralcea emoryi var. emoryi
Sphaeralcea grossulariifolia
Sphaeralcea grossulariifolia var. grossulariifolia* (under Sphaeralcea grossulariifolia)
Sphaeralcea munroana
Sphaeralcea orcuttii
Sphaeralcea rusbyi subsp. eremicola* (under Sphaeralcea rusbyi var. eremicola)
Sphaeralcea rusbyi var. eremicola
Sphaeromeria cana
Sphaeromeria potentilloides
Sphaeromeria potentilloides var. nitrophila
Sphaeromeria potentilloides var. potentilloides
Sphaerophysa salsula
Sphaeropteris cooperi
Sphenopholis obtusata
Sphenosciadium capitellatum
Spiraea densiflora subsp. splendens* (under Spiraea splendens)
Spiraea densiflora* (under Spiraea splendens)
Spiraea douglasii
Spiraea splendens
Spiranthes porrifolia
Spiranthes romanzoffiana
Spirodela oligorrhiza* (under Landoltia punctata)
Spirodela polyrhiza
Spirodela punctata* (under Landoltia punctata)
Sporobolus airoides
Sporobolus airoides var. wrightii* (under Sporobolus wrightii)
Sporobolus contractus
Sporobolus creber* (under Sporobolus indicus)
Sporobolus cryptandrus
Sporobolus cryptandrus var. strictus* (under Sporobolus contractus)
Sporobolus flexuosus
Sporobolus indicus
Sporobolus nealleyi* (under Sporobolus cryptandrus)
Sporobolus poiretii* (under Sporobolus indicus)
Sporobolus vaginiflorus
Sporobolus wrightii
Stachys ajugoides
Stachys ajugoides var. ajugoides* (under Stachys ajugoides)
Stachys ajugoides var. cymosa* (under Stachys pycnantha)
Stachys ajugoides var. quercetorum* (under Stachys rigida var. quercetorum)
Stachys ajugoides var. rigida* (under Stachys bergii) (under Stachys mexicana) (under Stachys rigida var. quercetorum) (under Stachys rigida var. rigida)
Stachys ajugoides var. stricta* (under Stachys stricta)
Stachys albens
Stachys albens var. juliensis* (under Stachys albens)
Stachys arvensis* (under Stachys)
Stachys bergii
Stachys bullata
Stachys californica* (under Stachys bullata)
Stachys chamissonis
Stachys flaccida* (under Stachys chamissonis)
Stachys gracilenta* (under Stachys rigida var. quercetorum)
Stachys lanuginosa* (under Stachys albens)
Stachys malacophylla* (under Stachys albens)
Stachys mexicana
Stachys palustris subsp. pilosa* (under Stachys pilosa)
Stachys pilosa
Stachys pycnantha
Stachys quercetorum* (under Stachys rigida var. quercetorum)
Stachys ramosa* (under Stachys ajugoides)
Stachys rigida
Stachys rigida subsp. lanata* (under Stachys bergii)
Stachys rigida subsp. quercetorum* (under Stachys rigida var. quercetorum)
Stachys rigida subsp. rivularis* (under Stachys rigida var. rigida)
Stachys rigida var. quercetorum
Stachys rigida var. rigida
Stachys stebbinsii
Stachys stricta
Stachys velutina* (under Stachys albens)
Stachys veronicifolia* (under Stachys rigida var. rigida)
Stachys viarum* (under Stachys rigida var. quercetorum)
Stanfordia californica* (under Caulanthus californicus)
Stanleya elata
Stanleya pinnata subsp. inyoensis* (under Stanleya pinnata var. pinnata)
Stanleya pinnata var. inyoensis* (under Stanleya pinnata var. pinnata)
Stanleya pinnata var. pinnata
Stanleya viridiflora
Staphylea bolanderi
Statice perezii* (under Limonium perezii)
Stebbinsoseris decipiens
Stebbinsoseris heterocarpa
Stellaria borealis subsp. sitchana
Stellaria calycantha
Stellaria crispa
Stellaria graminea
Stellaria lagunensis* (under Arenaria lanuginosa var. saxosa)
Stellaria littoralis
Stellaria longifolia
Stellaria longipes subsp. longipes
Stellaria longipes var. longipes* (under Stellaria longipes subsp. longipes)
Stellaria media
Stellaria media subsp. neglecta* (under Stellaria neglecta)
Stellaria neglecta
Stellaria nitens
Stellaria obtusa
Stellaria pallida
Stellaria umbellata
Stemodia durantifolia
Stenanthium occidentale
Stenotaphrum secundatum
Stenotus acaulis
Stenotus lanuginosus var. lanuginosus
Stenotus stenophyllus* (under Nestotus stenophyllus)
Stephanomeria blairii* (under Munzothamnus blairii)
Stephanomeria cichoriacea
Stephanomeria diegensis
Stephanomeria elata
Stephanomeria exigua
Stephanomeria exigua subsp. carotifera
Stephanomeria exigua subsp. coronaria
Stephanomeria exigua subsp. deanei
Stephanomeria exigua subsp. exigua
Stephanomeria exigua subsp. macrocarpa
Stephanomeria lactucina
Stephanomeria minor var. minor* (under Stephanomeria tenuifolia)
Stephanomeria minor var. myrioclada* (under Stephanomeria tenuifolia)
Stephanomeria minor* (under Stephanomeria tenuifolia)
Stephanomeria paniculata
Stephanomeria parryi
Stephanomeria pauciflora
Stephanomeria pauciflora var. parishii* (under Stephanomeria pauciflora)
Stephanomeria pauciflora var. pauciflora* (under Stephanomeria pauciflora)
Stephanomeria runcinata var. parishii* (under Stephanomeria pauciflora)
Stephanomeria spinosa* (under Pleiacanthus spinosus)
Stephanomeria tenuifolia
Stephanomeria tenuifolia var. myrioclada* (under Stephanomeria tenuifolia)
Stephanomeria tomentosa* (under Stephanomeria virgata subsp. virgata)
Stephanomeria virgata
Stephanomeria virgata subsp. pleurocarpa
Stephanomeria virgata subsp. virgata
Stillingia linearifolia
Stillingia paucidentata
Stillingia spinulosa
Stipa arida
Stipa brachychaeta
Stipa capensis
Stipa cernua
Stipa chaetophora
Stipa columbiana* (under Stipa nelsonii var. dorei)
Stipa comata
Stipa comata var. comata
Stipa comata var. intermedia
Stipa coronata
Stipa diegoensis
Stipa divaricata
Stipa exigua
Stipa formicarum* (under Stipa manicata)
Stipa hymenoides
Stipa kingii
Stipa latiglumis
Stipa lemmonii
Stipa lemmonii var. lemmonii
Stipa lemmonii var. pubescens
Stipa lepida
Stipa lettermanii
Stipa manicata
Stipa mauritanica
Stipa miliacea var. miliacea
Stipa nelsonii var. dorei
Stipa nevadensis
Stipa occidentalis
Stipa occidentalis var. californica
Stipa occidentalis var. occidentalis
Stipa occidentalis var. pubescens
Stipa parishii var. parishii
Stipa pinetorum
Stipa pulchra
Stipa purpurata
Stipa speciosa
Stipa stillmanii
Stipa thurberiana
Stipa webberi
Streptanthella longirostris
Streptanthella longirostris var. derelicta* (under Streptanthella longirostris)
Streptanthus albidus subsp. albidus* (under Streptanthus glandulosus subsp. albidus)
Streptanthus albidus subsp. peramoenus* (under Streptanthus glandulosus subsp. glandulosus)
Streptanthus albidus* (under Streptanthus glandulosus subsp. albidus)
Streptanthus anceps* (under Caulanthus anceps)
Streptanthus barbatus
Streptanthus barbiger
Streptanthus batrachopus
Streptanthus bernardinus
Streptanthus brachiatus
Streptanthus brachiatus subsp. hoffmanii* (under Streptanthus brachiatus)
Streptanthus breweri
Streptanthus breweri var. breweri* (under Streptanthus breweri)
Streptanthus breweri var. hesperidis* (under Streptanthus hesperidis)
Streptanthus callistus
Streptanthus campestris
Streptanthus cordatus
Streptanthus cordatus var. cordatus
Streptanthus cordatus var. duranii* (under Streptanthus cordatus var. cordatus)
Streptanthus cordatus var. exiguus* (under Streptanthus oliganthus)
Streptanthus cordatus var. piutensis
Streptanthus coulteri var. lemmonii* (under Caulanthus lemmonii)
Streptanthus diversifolius
Streptanthus drepanoides
Streptanthus farnsworthianus
Streptanthus fenestratus
Streptanthus flavescens* (under Caulanthus flavescens)
Streptanthus glandulosus
Streptanthus glandulosus subsp. albidus
Streptanthus glandulosus subsp. albidus* (under Streptanthus glandulosus subsp. albidus)
Streptanthus glandulosus subsp. arkii* (under Streptanthus glandulosus subsp. glandulosus)
Streptanthus glandulosus subsp. glandulosus
Streptanthus glandulosus subsp. hoffmanii
Streptanthus glandulosus subsp. niger
Streptanthus glandulosus subsp. pulchellus
Streptanthus glandulosus subsp. raichei* (under Streptanthus glandulosus subsp. glandulosus)
Streptanthus glandulosus subsp. secundus
Streptanthus glandulosus subsp. sonomensis
Streptanthus glandulosus var. hoffmanii* (under Streptanthus glandulosus subsp. hoffmanii)
Streptanthus glandulosus var. niger* (under Streptanthus glandulosus subsp. niger)
Streptanthus glandulosus var. pulchellus* (under Streptanthus glandulosus subsp. pulchellus)
Streptanthus glandulosus var. sonomensis* (under Streptanthus glandulosus subsp. sonomensis)
Streptanthus glaucus* (under Caulanthus glaucus)
Streptanthus gracilis
Streptanthus hallii* (under Caulanthus hallii)
Streptanthus hesperidis
Streptanthus heterophyllus* (under Caulanthus heterophyllus)
Streptanthus hispidus
Streptanthus howellii
Streptanthus inflatus* (under Caulanthus inflatus)
Streptanthus insignis
Streptanthus insignis subsp. insignis
Streptanthus insignis subsp. lyonii
Streptanthus longisiliquus
Streptanthus major* (under Caulanthus major)
Streptanthus morrisonii
Streptanthus morrisonii subsp. elatus* (under Streptanthus morrisonii)
Streptanthus morrisonii subsp. hirtiflorus* (under Streptanthus morrisonii)
Streptanthus morrisonii subsp. kruckebergii* (under Streptanthus morrisonii)
Streptanthus niger* (under Streptanthus glandulosus subsp. niger)
Streptanthus oblanceolatus
Streptanthus oliganthus
Streptanthus pilosus* (under Caulanthus pilosus)
Streptanthus polygaloides
Streptanthus simulans* (under Caulanthus simulans)
Streptanthus tortuosus
Streptanthus tortuosus var. flavescens* (under Streptanthus tortuosus)
Streptanthus tortuosus var. oblongus* (under Streptanthus tortuosus)
Streptanthus tortuosus var. optatus* (under Streptanthus tortuosus)
Streptanthus tortuosus var. orbiculatus* (under Streptanthus tortuosus)
Streptanthus tortuosus var. pallidus* (under Streptanthus tortuosus)
Streptanthus tortuosus var. suffrutescens* (under Streptanthus tortuosus)
Streptanthus vernalis
Streptanthus vimineus
Streptopus amplexifolius var. americanus
Strigosella africana
Struthiopteris spicant* (under Blechnum spicant)
Stuckenia filiformis subsp. alpina
Stuckenia pectinata
Stuckenia striata
Stutzia covillei
Stylocline citroleum
Stylocline gnaphalioides* (under Stylocline gnaphaloides)
Stylocline gnaphaloides
Stylocline intertexta
Stylocline masonii
Stylocline micropoides
Stylocline psilocarphoides
Stylocline sonorensis
Stylomecon heterophylla* (under Papaver heterophyllum)
Styrax officinalis var. californicus* (under Styrax redivivus)
Styrax officinalis var. fulvescens* (under Styrax redivivus)
Styrax officinalis var. redivivus* (under Styrax redivivus)
Styrax redivivus
Suaeda calceoliformis
Suaeda californica
Suaeda californica var. pubescens* (under Suaeda taxifolia)
Suaeda californica var. taxifolia* (under Suaeda taxifolia)
Suaeda depressa var. depressa* (under Suaeda calceoliformis)
Suaeda depressa var. erecta* (under Suaeda calceoliformis)
Suaeda esteroa
Suaeda fruticosa* (under Suaeda nigra)
Suaeda moquinii* (under Suaeda nigra)
Suaeda nigra
Suaeda occidentalis
Suaeda taxifolia
Suaeda torreyana var. ramosissima* (under Suaeda nigra)
Suaeda torreyana var. torreyana* (under Suaeda nigra)
Subularia aquatica subsp. americana
Subularia aquatica var. americana* (under Subularia aquatica subsp. americana)
Suksdorfia ranunculifolia* (under Hemieva ranunculifolia)
Swallenia alexandrae
Swertia albicaulis var. albicaulis* (under Frasera albicaulis var. modocensis)
Swertia albicaulis var. nitida* (under Frasera albicaulis var. nitida)
Swertia albicaulis* (under Frasera albicaulis)
Swertia albomarginata* (under Frasera albomarginata)
Swertia fastigiata* (under Frasera umpquaensis)
Swertia neglecta* (under Frasera neglecta)
Swertia parryi* (under Frasera parryi)
Swertia perennis
Swertia puberulenta* (under Frasera puberulenta)
Swertia radiata var. radiata* (under Frasera speciosa)
Swertia radiata* (under Frasera speciosa)
Swertia tubulosa* (under Frasera tubulosa)
Swertia umpquaensis* (under Frasera umpquaensis)
Syagrus romanzoffiana
Sympetaleia rupestris* (under Eucnide rupestris)
Symphoricarpos acutus* (under Symphoricarpos mollis)
Symphoricarpos albus var. laevigatus
Symphoricarpos hesperius* (under Symphoricarpos mollis)
Symphoricarpos longiflorus
Symphoricarpos mollis
Symphoricarpos rotundifolius
Symphoricarpos rotundifolius var. parishii
Symphoricarpos rotundifolius var. rotundifolius
Symphyotrichum ascendens
Symphyotrichum bracteolatum
Symphyotrichum campestre
Symphyotrichum campestre var. bloomeri* (under Symphyotrichum campestre)
Symphyotrichum chilense
Symphyotrichum chilense var. invenustum* (under Symphyotrichum chilense)
Symphyotrichum chilense var. medium* (under Symphyotrichum chilense)
Symphyotrichum defoliatum
Symphyotrichum eatonii* (under Symphyotrichum bracteolatum)
Symphyotrichum expansum* (under Symphyotrichum subulatum var. parviflorum)
Symphyotrichum foliaceum
Symphyotrichum foliaceum var. apricum
Symphyotrichum foliaceum var. parryi
Symphyotrichum frondosum
Symphyotrichum greatae
Symphyotrichum hendersonii
Symphyotrichum lanceolatum var. hesperium
Symphyotrichum lentum
Symphyotrichum spathulatum
Symphyotrichum spathulatum var. intermedium
Symphyotrichum spathulatum var. spathulatum
Symphyotrichum spathulatum var. yosemitanum
Symphyotrichum subspicatum
Symphyotrichum subulatum
Symphyotrichum subulatum var. elongatum
Symphyotrichum subulatum var. parviflorum
Symphyotrichum subulatum var. squamatum
Symphytum ×uplandicum
Symphytum asperum* (under Symphytum ×uplandicum)
Symphytum officinale
Synthyris cordata
Synthyris major* (under Synthyris missurica subsp. missurica)
Synthyris missurica subsp. missurica
Synthyris reniformis
Synthyris stellata* (under Synthyris missurica subsp. missurica)
Syntrichopappus fremontii
Syntrichopappus lemmonii
Systenotheca vortriedei
Syzygium australe

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