Southern California Wildflowers
Common names Q-S

Brackets [ ] indicate taxa not necessarily recognized by the Jepson Manual but which I think are deserving of separate listings because they are so very different. Names preceded by the word 'Common' in brackets such as [Common] Hawkweed are not necessarily the most common species of the genus, but simply do not have any other descriptive name. The use of the name [Common] in this context is solely for indexing purposes.

* Indicates introduced and naturalized species



Quailbush (Atriplex lentiformis)
Quaking aspen (Populus tremuloides)
Queen Anne's lace (Daucus carota)
Quillwort,
    Bolander's (Isoetes bolanderi)
    Flowering (Triglochin scilloides)
Rabbitbrush,
    Black-banded (Ericameria paniculata)
    Ghostly rubber (Ericameria nauseosa var. hololeuca)
    Green (Ericameria teretifolia)
    Mojave rubber (Ericameria nauseosa ssp. mohavensis)
    Parry's (Ericameria parryi var. aspera)
    San Bernardino rubber (Ericameria nauseosa var. bernardina)
    Sharp-bracted rubber (Ericameria nauseosa var. ceruminosa )
    Sticky-leaved (Chrysothamnus viscidiflorus ssp. viscidiflorus)
    Threadleaf rubber (Ericameria nauseosa ssp. oreophila)
    White-flowered (Ericameria albida)
Rabbitsfoot grass (Polypogon monspeliensis)*
Ragged-leaf bahia (Hymenothrix dissecta)
Ragweed, Western (Ambrosia psilostachya)
Ragwort,
    Dwarf mountain (Senecio fremontii var. occidentalis)
    Mojave (Senecio mohavensis)
    San Bernardino (Packera bernardina)
    Tehachapi (Packera ionophylla)
Raillardella, Silky (Raillardella argentea)
Rainbow manzanita (Arctostaphylos rainbowensis)
Ramona clarkia (Clarkia similis)
Ramona horkelia (Horkelia truncata)
Ranger's buttons (Sphenosciadium capitellatum)
Raspberry, Western (Rubus leucodermis)
Rattail fescue (Festuca myuros)*
Rattlesnake weed (Euphorbia albomarginata)
Rattleweed,
    Braunton's (Astragalus brauntonii)
    Newberry's (Astragalus newberryi var. newberryi)
Rayless encelia (Encelia frutescens)
Rayless fleabane (Erigeron aphanactis var. congestus)
Rayless goldfields (Lasthenia glaberrima)
Rayless shaggy fleabane (Erigeron aphanactis var. aphanactis)
Rebman's silverback fern (Pentagramma rebmanii)
Red ammannia (Ammannia coccinea)
Red baneberry (Actaea rubra)
Redberry,
    Hollyleaf (Rhamnus ilicifolia)
    Island (Rhamnus pirifolia)
    Littleleaf (Rhamnus crocea)
Red brome (Bromus madritensis ssp. rubens)*
Redbud, Western (Cercis occidentalis)
Red clover (Trifolium pratense)*
Red elderberry (Sambucus racemosa var. racemosa)
Red fescue (Festuca rubra)
Red-flowered buckwheat (Eriogonum grande var. rubescens)
Red four o'clock (Mirabilis coccinea)
Red-gland spurge (Euphorbia melanadenia)
Red grama (Bouteloua trifida)
Red iceplant (Malephora crocea)*
Red maids,
    Brewer's (Calandrinia breweri)
    [Common] (Calandrinia menziesii)
    Seaside (Cistanthe maritima)
Red mariposa lily (Calochortus kennedyi var. kennedyi)
Red monardella (Monardella macrantha ssp. hallii)
Redowski's stickseed (Lappula redowskii var. redowskii)
Red-rayed hulsea (Hulsea heterochroma)
Red Rock tarplant (Deinandra arida)
Red sand-spurrey (Spergularia rubra)*
Red sand verbena (Abronia maritima)
Red shanks (Adenostoma sparsifolium)
Red-skinned onion (Allium haematochiton)
Red spot clarkia (Clarkia speciosa ssp. polyantha)
Red-stem filaree (Erodium cicutarium)*
Redstem spring beauty (Claytonia rubra ssp. rubra)
Red-stemmed monkeyflower (Mimulus rubellus)
Red thistle (Cirsium arizonicum var. tenuisectum)
Red valerian (Centranthus ruber)*
Red willow (Salix laevigata)
Reflexed blazing star (Mentzelia reflexa)
Rein orchid,
    Alaska (Piperia unalascensis)
    [Common] (Piperia cooperi)
    Dense-flowered (Piperia elongata)
    Royal (Piperia transversa)
Retrorse desert four o'clock (Mirabilis laevis var. retrorsa)
Reveal's buckwheat (Eriogonum contiguum)
Rhatany,
    Littleleaf (Krameria erecta)
    White (Krameria bicolor)
Rhubarb, Wild (Rumex hymenosepalus)
Ribbed cryptantha (Cryptantha costata)
Ricegrass, Indian (Stipa hymenoides)
Rigid cryptantha (Cryptantha nevadensis var. rigida)
Rigid fiddleneck (Amsinckia retrorsa)
Rigid hedge-nettle (Stachys rigida)
Rigid spineflower (Chorizanthe rigida)
Ringstem, Sticky (Anulocaulis annulatus)
Ripgut brome (Bromus diandrus)*
Ripley's aliciella (Aliciella ripleyi)
River bar bird's-foot trefoil (Acmispon denticulatus)
Riverside spineflower (Chorizanthe xanti var. leucotheca)
Rixford's buckwheat (Eriogonum rixfordii)
Rixford's rockwort (Scopulophila rixfordii)
Robust heartleaf sun cup (Chylismia cardiophylla ssp. robusta)
Robust Hoffmann's buckwheat (Eriogonum hoffmannii var. robustius)
Robust sun cup (Camissoniopsis robusta)
Robust vervain (Verbena lasiostachys var. scabrida)
Rock-brake, American (Cryptogramma acrostichoides)
Rock buckwheat (Eriogonum saxatile)
Rock Creek broomrape (Orobanche valida ssp. valida)
Rock-cress,
    Arching (Boechera arcuata)
    Beautiful (Boechera pulchra)
    Bristly-leaved (Boechera rectissima)
    Broad-seeded (Boechera platysperma)
    California (Boechera californica)
    Parish's (Boechera parishii)
    Perennial (Boechera perennans)
    Pine (Boechera retrofracta X)
    Shockley's (Boechera shockleyi)
    Slender beautiful (Boechera xylopoda)
    Yosemite (Boechera repanda)
Rock crossosoma (Crossosoma bigelovii)
Rock daisy
    [Common] (Perityle emoryi)
    Nevada (Perityle megalocephala var. megalocephala)
Rock dudleya (Dudleya saxosa ssp. aloides)
Rock gilia (Gilia scopulorum)
Rock goldenbush (Ericameria cuneata var. cuneata)
Rock hibiscus (Hibiscus denudatus)
Rock ivesia (Ivesia saxosa)
Rockjasmine monkeyflower (Mimulus androsaceus)
Rock lady (Holmgrenanthe petrophila)
Rock melic (Melica stricta)
Rock mustard (Halimolobos jaegeri)
Rocknettle,
    Annual (Eucnide rupestris)
    Desert (Eucnide urens)
Rock pennyroyal (Monardella robisonii)
Rock phacelia (Phacelia egena)
Rock-rose,
    Crimson spot (Cistus ladanifer var. maculatus)*
    Orchid (Cistus Xpurpureus)*
    Pink (Cistus incanus)*
    White-flowered (Cistus ladanifer var. albiflorus)*
Rock spiraea (Petrophytum caespitosum ssp. caespitosum)
Rockwort, Rixford's (Scopulophila rixfordii)
Rocky Mountain rush (Juncus saximontanus)
Ropevine (Clematis pauciflora)
Rose,
    Cliff (Purshia stansburyana)
    Interior (Rosa woodsii ssp. gratissima)
    Small-leaved (Rosa minutifolia)
    Wild (Rosa californica)
    Wood (Rosa gymnocarpa var. gymnocarpa)
Rose-and-white buckwheat (Eriogonum gracillimum)
Rose clover (Trifolium hirtum)*
Rose evening primrose (Oenothera rosea)*
Rose heath (Chaetopappa ericoides)
Rose sage (Salvia pachyphylla)
Rose snapdragon (Antirrhinum multiflorum)
Ross's sedge (Carex rossii)
Rosy apricot mallow (Sphaeralcea ambigua var. rosacea)
Rosy gilia (Gilia sinuata)
Rosy pussytoes (Antennaria rosea ssp. confinis)
Rosy spinystar (Coryphantha vivipara var rosea)
Rothrock's keckiella (Keckiella rothrockii var. rothrockii)
Rothrock's nama (Nama rothrockii)
Rothrock's sagebrush (Artemisia rothrockii)
Rough cat's ear (Hypochaeris radicata)*
Rough hairy golden-aster (Heterotheca villosa var. scabra)
Rough joint-fir (Ephedra aspera)
Rough menodora (Menodora scabra)
Roughseed cryptantha (Cryptantha flavoculata)
Round-fruited bladderpod (Peritoma arborea var. globosa)
Roundleaf geranium (Geranium rotundifolium)*
Roundleaf leather root (Hoita orbicularis)
Roundleaf oxytheca (Oxytheca perfoliata)
Round-leaved boykinia (Boykinia rotundifolia)
Round-leaved phacelia (Phacelia rotundifolia)
Royal desert lupine (Lupinus odoratus)
Royal goldfields (Lasthenia coronaria)
Royal penstemon (Penstemon speciosus)
Royal rein orchid (Piperia transversa)
Rubber rabbitbrush,
    Ghostly (Ericameria nauseosa var. hololeuca)
    Mojave (Chrysothamnus nauseosus ssp. mohavensis)
    San Bernardino (Ericameria nauseosa var. bernardina)
    Sharp-bracted (Ericameria nauseosa var. ceruminosa)
    Threadleaf (Chrysothamnus nauseosus ssp. consimilis)
Rusby's desert mallow (Sphaeralcea rusbyi var. eremicola)
Rush,
    Basket (Juncus textilis)
    Brown-headed (Juncus phaeocephalus var. paniculatus)
    Common toad (Juncus bufonius var. bufonius)
    Coville's (Juncus covillei)
    Clustered toad (Juncus bufonius var. congestus)
    Iris-leaved (Juncus xiphioides)
    Long-anthered (Juncus macrandus)
    Long-leaved (Juncus macrophyllus)
    Mariposa (Juncus dubius)
    Mexican (Juncus mexicanus)
    Moss (Juncus bryoides)
    Pacific (Juncus effusus ssp. pacificus)
    Pacific wood (Luzula comosa)
    Rocky Mountain (Juncus saximontanus)
    Spiny (Juncus acutus ssp. leopoldii)
    Spreading (Juncus patens)
    Straightleaf (Juncus orthophyllus)
    Tiehm's (Juncus tiehmii)
    Western toad (Juncus bufonius var. occidentalis)
    Wire (Juncus balticus)
    Wrinkled (Juncus rugulosus)
Rush bluegrass (Poa secunda ssp. juncifolia)
Rush milkweed (Asclepias subulata)
Rush seepweed (Suaeda nigra)
Rush-rose, see Peak rush-rose
Russian knapweed (Acroptilon repens)*
Russian thistle (Salsola tragus)*
Rusty slender sedge (Carex subfusca)
Rusty-haired popcorn flower (Plagiobothrys nothofulvus)
Rydberg's horkelia (Horkelia rydbergii)
Ryegrass, Italian (Festuca perennis)*
Sacapellote (Acourtia microcephala)
Sacred datura (Datura wrightii)
Safflower (Carthamus tinctorius)*
Sage,
    Black (Salvia mellifera)
    Blue (Salvia dorrii var. dorrii)
    Blue (Salvia dorrii var. pilosa)
    Brandegee's (Salvia brandegeei)
    Cleveland's (Salvia clevelandii)
    Creeping (Salvia sonomensis)
    Crimson pitcher (Salvia spathacea)
    Death Valley (Salvia funerea)
    Desert (Salvia eremostachya)
    Fragrant pitcher (Lepechinia fragrans)
    Munz's (Salvia munzii)
    Purple (Salvia leucophylla)
    Rose (Salvia pachyphylla)
    Thistle (Salvia carduacea)
    Vasey's (Salvia vaseyi)
    White (Salvia apiana)
Sagebrush,
    Basin (Artemisia tridentata ssp. tridentata)
    Black (Artemisia nova)
    California (Artemisia californica)
    Flat (Artemisia bigelovii)
    Mountain (Artemisia tridentata ssp. vaseyana)
    Parish's (Artemisia tridentata ssp. parishii)
    Rothrock's (Artemisia rothrockii)
Sagebrush sedge (Carex filifolia var. erostrata)
Saguaro, Giant (Carnegiea gigantea)
Saharan mustard (Brassica tournefortii)*
Salsify,
    Purple (Tragopogon porrifolius)*
    Yellow (Tragopogon dubius)*
Saltbush,
    Arrowleaf (Atriplex prostrata)*
    Australian (Atriplex semibaccata)*
    Beach (Atriplex leucophylla)
    Caleb (Atriplex canescens var. laciniata)
    California (Atriplex californica)
    Coulter's (Atriplex coulteri)
    Four-wing (Atriplex canescens var. canescens)
    Pacific (Atriplex pacifica)
    Shadscale (Atriplex confertifolia)
    Slenderleaf (Atriplex canescens var. linearis)
    Swamp (Atriplex amnicola)*
    Torrey's (Atriplex torreyi var. torreyi)
    Watson's (Atriplex watsonii)
    Waxy (Atriplex glauca)*
    Wheelscale (Atriplex elegans var. fasciculata)
Salt cedar (Tamarix ramosissima)*
Salt grass (Distichlis spicata)
Salt marsh baccharis (Baccharis glutinosa)
Salt marsh bird's beak (Chloropyron maritimum ssp. maritimum)
Salt marsh dodder (Cuscuta salina)
Salt marsh fleabane (Pluchea odorata var. odorata)
Salt marsh sand-spurrey (Spergularia marina)
Salton milkvetch (Astragalus crotalariae)
Saltwort (Batis maritima)
San Antonio Canyon bedstraw (Galium angustifolium ssp. gabrielense)
San Bernardino aster (Symphyotrichum defoliatum)
San Bernardino beardtongue (Penstemon caesius)
San Bernardino bluegrass (Poa atropurpurea)
San Bernardino buckwheat (Eriogonum microthecum var. corymbosoides)
San Bernardino mountain onion (Allium monticola)
San Bernardino Mountains alumroot (Heuchera parishii)
San Bernardino Mountains bladderpod (Physaria kingii ssp. bernardina)
San Bernardino Mountains dudleya (Dudleya abramsii ssp. affinis)
San Bernardino Mountains monkeyflower (Mimulus exiguus)
San Bernardino Mountains owl's clover (Castilleja lasiorhyncha)
San Bernardino ragwort (Packera bernardina)
San Bernardino rubber rabbitbrush (Ericameria nauseosa var. bernardina)
San Bernardino showy gilia (Gilia cana ssp. bernardina)
San Bernardino sun cup (Camissoniopsis confusa)
San Clemente Island bird's-foot trefoil (Acmispon argophyllus var. adsurgens)
San Clemente Island bush mallow (Malacothamnus clementinus)
San Diego ambrosia (Ambrosia pumila)
San Diego button-celery (Eryngium aristulatum var. parishii)
San Diego chamise (Adenostoma fasciculatum var. obtusifolium)
San Diego County goldeneye (Bahiopsis laciniata)
San Diego County needlegrass (Stipa diegoensis)
San Diego gilia (Gilia diegensis)
San Diego gumplant (Grindelia hallii)
San Diego hulsea (Hulsea californica)
San Diego mountain mahogany (Cercocarpus minutiflorus)
San Diego pea (Lathyrus vestitus var. alefeldii)
San Diego satureja (Clinopodium chandleri)
San Diego sedge (Carex spissa)
San Diego tarplant (Deinandra paniculata)
San Diego thornmint (Acanthomintha ilicifolia)
San Diego wreathplant (Stephanomeria diegensis)
San Felipe dyssodia (Adenophyllum porophylloides)
San Fernando Valley spineflower (Chorizanthe parryi var. fernandina)
San Gabriel beardtongue (Penstemon labrosus)
San Gabriel beardtongue (yellow variant) (Penstemon labrosus)
San Gabriel bluecup (Githopsis diffusa ssp. diffusa)
San Gabriel linanthus (Linanthus concinnus)
San Gabriel manzanita (Arctostaphylos glandulosa ssp. gabrielensis)
San Gabriel Mountains dudleya (Dudleya densiflora)
San Gabriel Mountains gilia (Gilia ochroleuca ssp. vivida)
San Gabriel Mountains hulsea (Hulsea vestita ssp. gabrielensis)
San Gabriel Mountains leather oak (Quercus durata var. gabrielensis)
San Gabriel River dudleya (Dudleya cymosa ssp. crebrifolia)
San Jacinto beardtongue (Penstemon clevelandii var. connatus)
San Jacinto buckwheat (Eriogonum apiculatum)
San Jacinto lupine (Lupinus hyacinthinus)
San Jacinto Mountains bedstraw (Galium angustifolium ssp. jacinticum)
San Jacinto Mountains fleabane (Erigeron breweri var. jacinteus)
San Jacinto Mountains keckiella (Keckiella rothrockii var. jacintensis)
San Jacinto prickly phlox (Linanthus jaegeri)
San Joaquin adobe sunburst (Pseudobahia peirsonii)
San Luis Obispo milkvetch (Astragalus curtipes)
San Miguel Island bedstraw (Galium californicum ssp. miguelense)
San Miguel Island deerweed (Acmispon dendroideus var. veatchii)
San Miguel milkvetch (Astragalus miguelensis)
Sandbar willow (Salix exigua var. exigua)
Sand blazing star (Mentzelia involucrata)
Sand cress (Calyptridium monandrum)
Sand-dune bluegrass (Poa douglasii)
Sand food (Pholisma sonorae)
Sand gilia (Aliciella triodon)
Sand-lettuce (Dudleya caespitosa)
Sand lupine (Lupinus brevicaulis)
Sandmat (Cardionema ramosissimum)
Sandpaper plant (Petalonyx thurberi ssp. thurberi)
Sandpaper plant, Shinyleaf (Petalonyx nitidus)
Sand plantain (Plantago arenaria)*
Sand spikerush (Eleocharis montevidensis)
Sand-spurrey,
    Boccone's (Spergularia bocconi)*
    Hairy (Spergularia villosa)*
    Red (Spergularia rubra)*
    Salt marsh (Spergularia marina)
    Sticky (Spergularia macrotheca var. macrotheca)
Sand verbena,
    Desert (Abronia villosa var. aurita)
    Desert (Abronia villosa var. villosa)
    Mojave (Abronia pogonantha)
    Pink (Abronia umbellata var. umbellata)
    Red (Abronia maritima)
    White (Abronia turbinata)
Sandwort,
    Annual (Minuartia pusilla)
    Bear Valley (Eremogone ursina)
    Brittle (Minuartia nuttallii var. gracilis)
    Desert (Eremogone macradenia var. macradenia)
    Forest camp (Eremogone macradenia var. arcuifolia)
    King's (Eremogone kingii var. glabrescens)
    Spreading (Arenaria lanuginosa var. saxosa)
Sanicle,
    Pacific (Sanicula crassicaulis)
    Poison (Sanicula bipinnata)
    Purple (Sanicula bipinnatifida)
    Sierra (Sanicula graveolens)
Santa Ana River woolstar (Eriastrum densifolium ssp. sanctorum)
Santa Barbara Island dudleya (Dudleya traskiae)
Santa Barbara milkvetch (Astragalus trichopodus var. phoxus)
Santa Catalina Island ironwood (Lyonothamnus floribundus ssp. floribundus)
Santa Catalina Island manzanita (Arctostaphylos catalinae)
Santa Cruz Island bird's-foot trefoil (Acmispon argophyllus var. niveus)
Santa Cruz Island buckwheat (Eriogonum arborescens)
Santa Cruz Island fringe-pod (Thysanocarpus conchuliferus)
Santa Cruz Island gooseberry (Ribes thacherianum)
Santa Monica Mountains manzanita, see Transverse Range manzanita
Santa Rosa basalt brodiaea (Brodiaea santarosae)
Santa Rosa Island manzanita (Arctostaphylos confertiflora)
Santa Rosa Island torrey pine (Pinus torreyana ssp. insularis)
Santa Rosa Mountains linanthus (Leptosiphon floribundus ssp. hallii)
Santa Susana tarplant (Deinandra minthornii)
Santa Ynez wild buckwheat (Eriogonum cithariforme var. agninum)
Santolina pincushion (Chaenactis santolinoides)
Sanvitalia, Abert's (Sanvitalia abertii)
Sapphire woolstar (Eriastrum sapphirinum)
Satintail, California (Imperata brevifolia)
Satureja, San Diego (Clinopodium chandleri)
Savory, Monkeyflower (Clinopodium mimuloides)
Sawatch knotweed (Polygonum sawatchense ssp. sawatchense)
Sawtooth goldenbush (Hazardia squarrosa var. grindelioides)
Saxifrage, California (Micranthes californica)
Scalebroom (Lepidospartum squamatum)
Scalebud (Anisocoma acaulis)
Scalloped moonwort (Botrychium crenulatum)
Scaly cloak fern (Astrolepis cochisensis)
Scaly-stemmed sand plant (Pholisma arenarium)
Scarlet bugler (Penstemon centranthifolius)
Scarlet gaura (Oenothera suffrutescens)
Scarlet larkspur (Delphinium cardinale)
Scarlet lobelia (Lobelia cardinalis var. pseudosplendens)
Scarlet milkvetch (Astragalus coccineus)
Scarlet monkeyflower (Mimulus cardinalis)
Scarlet pimpernel (Anagallis arvensis)*
Scarlet spiderling (Boerhavia coccinea)
Scented cryptantha (Cryptantha utahensis)
Schott's calico (Loeseliastrum schottii)
Schott's indigo bush (Psorothamnus schottii)
Scouler's St. John's wort (Hypericum scouleri)
Scouler's willow (Salix scouleriana)
Screwbean mesquite (Prosopis pubescens)
Scrub aster (Dieteria asteroides var. asteroides)
Scrub lotus (Acmispon argyraeus var. multicaulis)
Scrub oak,
    Channel Island (Quercus pacifica)
    Coastal (Quercus dumosa)
    Desert (Quercus john-tuckeri)
    Inland (Quercus berberidifolia)
Sea beet (Beta vulgaris ssp. maritima)
Sea dahlia (Leptosyne maritima)
Sea fig (Carpobrotus chilensis)*
Sea rocket (Cakile maritima)*
Sea-blite,
    Estuary (Suaeda esteroa)
    Woolly (Suaeda taxifolia)
Seacliff buckwheat (Eriogonum parvifolium)
Sea-lavender (Limonium californicum)
Sea-pink, California (Armeria maritima ssp. californica)
Searls' prairie clover (Dalea searlsiae)
Seashore bentgrass (Agrostis pallens)
Seaside brome (Bromus maritimus)
Seaside daisy (Erigeron glaucus)
Seaside fiddleneck (Amsinckia spectabilis var. spectabilis)
Seaside petunia (Petunia parviflora)
Seaside red maids (Cistanthe maritima)
Sedge,
    Black (Schoenus nigricans)
    Bolander's (Carex bolanderi)
    Clustered field (Carex praegracilis)
    Dense (Carex densa)
    Forest (Carex multicaulis)
    Fragile-sheathed (Carex fracta)
    Golden (Carex aurea)
    Ross's sedge (Carex rossii)
    Rusty slender (Carex subfusca)
    Sagebrush (Carex filifolia var. erostrata)
    San Diego (Carex spissa)
    Smooth-fruited (Carex heteroneura)
    Sturdy (Carex alma)
    Swamp (Carex senta)
    Tall flat (Cyperus eragrostis)
    Triangular-fruit (Carex triquetra)
Seepweed, Rush (Suaeda nigra)
Self-heal (Prunella vulgaris var. lanceolata)
Senecio, Bush (Senecio flaccidus var. douglasii)
Senna,
    Bladder (Colutea arborescens) *
    Coues' (Senna covesii)
    Desert (Senna armata)
    Silver (Senna artemisioides)
Sequoia, Giant (Sequoiadendron giganteum) *
Serviceberry, Utah (Amelanchier utahensis)
Shadscale saltbush (Atriplex confertifolia)
Shaggy hawkweed (Hieracium horridum)
Shaggy-haired alumroot (Heuchera hirsutissima)
Sharp-bracted rubber rabbitbrush (Ericameria nauseosa var. ceruminosa)
Sharpleaf cancerwort (Kickxia elatine) *
Sharpnut cryptantha (Cryptantha oxygona)
Shaw's agave (Agave shawii var. shawii)
Sheep sorrel (Rumex acetosella) *
Sheep's locoweed (Astragalus pachypus)
Shelton's violet (Viola sheltonii)
Shepherd's purse (Capsella bursa-pastoris) *
Shining chickweed (Stellaria nitens)
Shining milkvetch (Astragalus lentiginosus var. micans)
Shining willow (Salix lasiandra var. lasiandra)
Shiny lomatium (Lomatium lucidum)
Shiny peppergrass (Lepidium nitidum)
Shinyleaf sandpaper plant (Petalonyx nitidus)
Shockley's goldenheads (Acamptopappus shockleyi)
Shockley's prickleleaf (Hecastocleis shockleyi)
Shockley's rock-cress (Boechera shockleyi)
Shooting star,
    Alpine (Primula tetrandra)
    [Common] (Primula clevelandii ssp. clevelandii)
    Foothill (Primula hendersonii)
    Fragrant (Primula fragrans)
    Island (Primula clevelandii ssp. insularis)
Shoregrass (Distichlis littoralis)
Shortawn foxtail (Alopecurus aequalis var. aequalis)
Short-bannered coastal lotus (Acmispon brevivexillus var. brevivexillus)
Shortflower buckwheat (Eriogonum brachyanthum)
Short-flowered California dodder (Cuscuta occidentalis)
Short-fruited filaree (Erodium brachycarpum)*
Short-joint beavertail cactus (Opuntia basilaris var. brachyclada)
Shortleaf baccharis (Baccharis brachyphylla)
Short-leaved cliff aster (Malacothrix saxatilis var. tenuifolia)
Short-leaved squirreltail (Elymus elymoides ssp. brevifolius)
Short-lobed broomrape (Orobanche parishii ssp. brachyloba)
Shortpod mustard (Hirschfeldia incana)*
Shortray fleabane (Erigeron lonchophyllus)
Short-winged deerweed (Acmispon glaber var. brevialatus)
Showy Brewer's lupine (Lupinus breweri var. grandiflorus)
Showy cycladenia (Cycladenia humilis var. venusta)
Showy gilia (Gilia cana ssp. speciformis)
Showy island snapdragon (Gambelia speciosa)
Showy prickly-nut cryptantha (Cryptantha muricata var. muricata)
Shrub live oak (Quercus turbinella)
Shrubby brickellbush (Brickellia frutescens)
Shrubby indian mallow (Abutilon abutiloides)*
Shrubby interior live oak (Quercus wislizeni var. frutescens)
Sibbaldia (Sibbaldia procumbens)
Siberian milfoil (Myriophyllum sibiricum)
Sicklegrass, Curved (Parapholis incurva)*
Sicklepod rock-cress, see Elegant rock-cress
Side-oats grama (Bouteoua curtipendula)
Sierra gooseberry (Ribes roezlii var. roezlii)
Sierra helianthella (Helianthella californica var. nevadensis)
Sierra hoary coffeeberry (Frangula californica ssp. cuspidata)
Sierra lessingia (Lessingia leptoclada)
Sierra lewisia (Lewisia nevadensis)
Sierra man-root (Marah horrida)
Sierra nemophila (Nemophila spatulata)
Sierra Nevada lotus (Acmispon nevadensis var. nevadensis)
Sierra Nevada monkeyflower (Erythranthe sierrae)
Sierra onion (Allium campanulatum)
Sierra sanicle (Sanicula graveolens)
Sierra tansy mustard (Descurainia californica)
Sigmoid threadplant (Nemacladus sigmoideus)
Silktassel,
    Ashy (Garrya flavescens)
    Canyon (Garrya veatchii)
    Coast (Garrya elliptica)
    Fremont's (Garrya fremontii)
Silky dalea (Dalea mollis)
Silky deerweed (Acmispon procumbens var. procumbens)
Silky lupine (Lupinus elatus)
Silky raillardella (Raillardella argentea)
Silverback fern, Rebman's (Pentagramma rebmanii)
Silver beach bur (Ambrosia chamissonis)
Silver bush lupine (Lupinus albifrons var. albifrons)
Silver cholla (Cylindropuntia echinocarpa)
Silver-haired ivesia (Ivesia argyrocoma var. argyrocoma)
Silver Lake daisy (Arida arizonica)
Silverleaf cinquefoil (Potentilla anserina ssp. anserina)
Silverleaf horse-nettle (Solanum elaeagnifolium)*
Silver lotus (Acmispon argophyllus var. argophyllus)
Silver puffs (Uropappus lindleyi)
Silver senna (Senna artemisioides)*
Silverweed (Potentilla anserina ssp. pacifica)
Silver wormwood (Artemisia ludoviciana ssp. incompta)
Silvery false-lupine (Thermopsis californica var. argentata)
Silvery lupine (Lupinus argenteus var. argenteus)
Simpson's buckwheat (Eriogonum microthecum var. simpsonii)
Singleleaf pinyon pine (Pinus monophylla)
Single-rosetted desert agave (Agave deserti var. simplex)
Single-toothed sticky cinquefoil (Drymocallis glandulosa var. viscida)
Six-weeks fescue (Festuca octoflora)
Skeleton-plant, Thorny (Pleiacanthus spinosus)
Skullcap,
    Common (Scutellaria tuberosa)
    Grayleaf (Scutellaria siphocampyloides)
    Southern (Scutellaria bolanderi ssp. austromontana)
Skunkbrush (Rhus aromatica)
Sky lupine (Lupinus nanus)
Sky pilot, Western (Polemonium occidentale)
Sleepy catchfly (Silene antirrhina)
Slender beautiful rock-cress (Boechera xylopoda)
Slender bedstraw (Galium angustifolium ssp. gracillimum)
Slender boerhavia (Boerhavia triquetra)
Slender buckwheat (Eriogonum gracile var. gracile)
Slender cinquefoil (Potentilla gracilis var. fastigiata)
Slender cottonweed (Micropus californicus var. californicus)
Slender cryptantha (Cryptantha gracilis)
Slender draba (Draba albertina)
Slender everlasting (Pseudognaphalium thermale)
Slender fescue (Vulpia octoflora var. octoflora)
Slender goldenweed (Xanthisma gracile)
Slender hairgrass (Deschampsia elongata)
Slenderleaf collomia (Collomia linearis)
Slenderleaf saltbush (Atriplex canescens var. linearis)
Slender-leaved iceplant (Mesembryanthemum nodiflorum)*
Slender-leaved sunflower (Helianthus gracilentus)
Slender lip fern (Myriopteris gracilis)
Slender-lobed four o'clock (Mirabilis tenuiloba)
Slender mariposa lily (Calochortus clavatus var. gracilis)
Slender oats (Avena barbata)*
Slender pectocarya (Pectocarya linearis ssp. ferocula)
Slender-petalled mustard (Thelypodium stenopetalum)
Slender phlox (Microsteris gracilis)
Slender-pod jewelflower (Caulanthus heterophyllus)
Slender popcorn flower (Plagiobothrys tenellus)
Slender poreleaf (Porophyllum gracile)
Slender tarplant (Deinandra fasciculata)
Slender threadplant (Nemacladus tenuis var. tenuis)
Slender vetch (Vicia hassei)
Slender volcanic gilia (Gilia ochroleuca ssp. exilis)
Slender wheat grass (Elymus trachycaulus ssp. trachycaulus)
Slender wild cabbage (Caulanthus major)
Slender woodland star (Lithophragma tenellum)
Slender woollyheads (Psilocarphus tenellus)
Slim aster (Symphyotrichum subulatum var. parviflorum)
Slim tridens (Triden muticus)
Slim vetch (Vicia ludoviciana ssp. ludoviciana)
Small evening primrose (Camissoniopsis micrantha)
Small fescue (Festuca microstachys)
Small horseweed (Erigeron bonariensis)*
Small water-plantain buttercup (Ranunculus alismifolius var. alismellus)
Small wirelettuce (Stephanomeria exigua ssp. exigua)
Smallflower bluecurls (Trichostema micranthum)
Smallflower cryptantha (Cryptantha micrantha var. micrantha)
Smallflower monkeyflower (Mimulus inconspicuus)
Smallflower notchleaf phacelia (Phacelia crenulata var. minutiflora)
Smallflower threadplant (Nemacladus ramosissimus)
Smallflower woodland star (Lithophragma parviflorum var. parviflorum)
Small-flowered collinsia (Collinsia parviflora)
Small-flowered dwarf flax (Hesperolinon micranthum)
Small-flowered eucrypta (Eucrypta micrantha)
Small-flowered fiddleneck, see Rigid fiddleneck
Small-flowered groundsmoke (Gayophytum diffusum ssp. parviflorum)
Small-flowered lotus (Acmispon micranthus)
Small-flowered meconella (Meconella denticulata)
Small-flowered morning glory (Convolvulus simulans)
Small-flowered nightshade (Solanum americanum)
Small-flowered soap plant (Chlorogalum parviflorum)
Small-flowered tamarisk (Tamarix parviflora)*
Small-fruited seaside fiddleneck, see Mesa fiddleneck
Small-head field clover (Trifolium microcephalum)
Small-leaved cream bush (Holodiscus discolor var. microphyllus)
Small-leaved nama (Nama pusillum)
Small-leaved rose (Rosa minutifolia)
Small-seeded spurge (Euphorbia polycarpa)
Smartweed,
    Himalayan (Persicaria capitata)*
    Water (Persicaria punctata)
    Willow (Persicaria lapathifolia)
Smilo grass (Stipa miliacea var. miliacea)*
Smoke tree (Psorothamnus spinosus)
Smooth beggar-ticks (Bidens laevis)
Smooth boisduvalia (Epilobium campestre)
Smooth cat's ear (Hypochaeris glabra)*
Smooth flatsedge (Cyperus laevigatus)
Smooth many-flowered linanthus (Leptosiphon floribundus ssp. glaber)
Smooth scouring rush (Equisetum laevigatum)
Smooth willow-herb (Epilobium glaberrimum ssp. glaberrimum)
Smooth-fruited sedge (Carex heteroneura)
Smoothleaf yerba santa (Eriodictyon trichocalyx var. trichocalyx)
Smooth showy penstemon (Penstemon spectabilis var. spectabilis)
Smooth-stemmed fagonia (Fagonia laevis)
Smooth winter vetch (Vicia villosa ssp. varia)*
Snakeroot (Sanicula arguta)
Snake's head (Malacothrix coulteri)
Snakeweed,
    Broom (Gutierrezia sarothrae)
    Sticky (Gutierrezia microcephala)
Snapdragon,
    Desert twining (Antirrhinum filipes)
    Rose (Antirrhinum multiflorum)
    Showy island (Gambelia speciosa)
    Twining (Antirrhinum kelloggii)
    Violet (Antirrhinum nuttallianum ssp. nuttallianum)
    Violet twining (Maurandella antirrhiniflora)
    White (Antirrhinum coulterianum)
Sneezeweed,
    Bigelow's (Helenium bigelovii)
    [Common] (Helenium puberulum)
Snow plant (Sarcodes sanguinea)
Snowberry,
    Creeping (Symphoricarpos mollis)
    Desert (Symphoricarpos longiflorus)
    Mountain (Symphoricarpos rotundifolius var. parishii)
    White (Symphoricarpos albus var. laevigatus)
Snowdrop bush (Styrax redivivus)
Soap plant,
    [Common] (Chlorogalum pomeridianum var. pomeridianum)
    Small-flowered (Chlorogalum parviflorum)
Soda straw (Angelica lineariloba)
Soft arnica (Arnica mollis)
Soft chess (Bromus hordeaceus)*
Soft-leaved indian paintbrush (Castilleja mollis)
Solitary-leaved alkali goldenbush (Isocoma acradenia var. eremophila)
Solomon's seal
    False (Maianthemum racemosum)
    Star-flowered false (Maianthemum stellatum)
Sonoran spurge (Euphorbia micromera)
Sourclover (Melilotus indicus)*
South African cornflag (Chasmanthe floribunda)*
Southern alpine buckwheat (Eriogonum kennedyi var. alpigenum)
Southern bluecurls (Trichostema austromontanum ssp. austromontanum)
Southern California draba (Draba corrugata)
Southern California morning glory (Calystegia macrostegia ssp. arida)
Southern California rock draba (Draba saxosa)
Southern cattail (Typha domingensis)
Southern Chinese houses (Collinsia concolor)
Southern coast live oak (Quercus agrifolia var. oxyadenia)
Southern foothill penstemon (Penstemon heterophyllus var. australis)
Southern goldenrod (Solidago confinis)
Southern honeysuckle (Lonicera subspicata var. denudata)
Southern island morning glory (Calystegia macrostegia ssp. amplissima)
Southern jewelflower (Streptanthus campestris)
Southern meadow thistle (Cirsium scariosum var. citrinum)
Southern miner's lettuce (Claytonia perfoliata ssp. mexicana)
Southern monardella (Monardella australis ssp. australis)
Southern mountain buckwheat (Eriogonum kennedyi var. austromontanum)
Southern mountain cutleaf (Hymenopappus filifolius var. lugens)
Southern mountain lupine (Lupinus excubitus var. austromontanus)
Southern mountain misery (Chamaebatia australis)
Southern mountain phacelia (Phacelia austromontana)
Southern mountain phlox (Phlox austromontana)
Southern mountain woolstar (Eriastrum densifolium ssp. austromontanum)
Southern skullcap (Scutellaria bolanderi ssp. austromontana)
Southern tarplant (Centromadia parryi ssp. australis)
Southern tauschia (Tauschia arguta)
Southern woodland-gilia (Saltugilia australis)
Southwestern bushy bluestem (Andropogon glomeratus var. scabriglumis)
Sow-thistle,
    [Common] (Sonchus oleraceus)*
    Prickly (Sonchus asper ssp. asper)*
Spanish broom (Spartium junceum)*
Spanish clover (Acmispon americanus var. americanus)
Spanish needles,
    [Common] (Palafoxia arida var. arida)
    Giant (Palafoxia arida var. gigantea)
Sparse-flowered bog orchid (Platanthera sparsiflora)
Spearleaf brickellbush (Brickellia atractyloides var. arguta)
Spearleaf mountain dandelion (Agoseris retrorsa)
Spearmint (Mentha spicata)*
Speckled clarkia (Clarkia cylindrica ssp. cylindrica)
Spectacle pod (Dithyrea californica)
Speedwell,
    American (Veronica americana)
    Corn (Veronica arvensis) *
    Persian (Veronica persica)*
    Purslane (Veronica peregrina ssp. xalapensis)
    Thyme-leaved (Veronica serpyllifolia ssp. humifusa)*
    Water (Veronica anagallis-aquatica)*
Spicebush (Calycanthus occidentalis)*
Spiderling,
    Coulter's (Boerhavia coulteri var. palmeri)
    Scarlet (Boerhavia coccinea)
    Slender (Boerhavia triquetra var. intermedia)
    Wright's (Boerhavia wrightii)
Spike fescue (Festuca kingii)
Spike-moss,
    Ashy (Selaginella cinerascens)
    Bigelow's (Selaginella bigelovii)
    Bluish (Selaginella asprella)
    Desert (Selaginella eremophila)
    Hansen's (Selaginella hansenii)
    Watson's (Selaginella watsonii)
Spike primrose (Epilobium densiflorum)
Spikerush,
    Common (Eleocharis macrostachya)
    Needle (Eleocharis acicularis var. acicularis)
    Sand (Eleocharis montevidensis)
Spikeweed (Centromadia pungens ssp. pungens)
Spineflower,
    Brittle (Chorizanthe brevicornu var. brevicornu)
    California (Mucronea californica)
    Five-tooth (Chorizanthe watsonii)
    Fringed (Chorizanthe fimbriata var. fimbriata)
    Lace-fringed (Chorizanthe fimbriata var. laciniata)
    Leather (Lastarriaea coriacea)
    Mojave (Chorizanthe spinosa)
    Peninsular (Chorizanthe leptotheca)
    Pink (Chorizanthe membranacea)
    Prostrate (Chorizanthe procumbens)
    Rigid (Chorizanthe rigida)
    Riverside (Chorizanthe xanti var. leucotheca)
    San Fernando Valley (Chorizanthe parryi var. fernandina)
    Thurber's spineflower (Centrostegia thurberi)
    Wrinkled (Chorizanthe corrugata)
    Xantus' (Chorizanthe xanti var. xanti)
Spineless horsebrush (Tetradymia canescens)
Spiny aster (Chloracantha spinosa var. spinosa)
Spiny cocklebur (Xanthium spinosum)
Spiny greasebush (Glossopetalon spinescens var. aridum)
Spiny hopsage (Grayia spinosa)
Spiny horsebrush (Tetradymia spinosa)
Spiny menodora (Menodora spinescens)
Spiny rush (Juncus acutus ssp. leopoldii)
Spinystar,
    Alverson's (Coryphantha alversonii)
    Desert (Coryphantha chlorantha)
    Rosy (Coryphantha vivipara var. rosea)
Spiraea, Rock (Petrophyton caespitosum)
Splendid woodland-gilia (Saltugilia splendens ssp. splendens)
Splendid mariposa lily (Calochortus splendens)
Spotted buckwheat (Eriogonum maculatum)
Spotted coralroot (Corallorhiza maculata)
Spotted downingia (Downingia bella)
Spotted knapweed (Centaurea stoebe ssp. micranthos)*
Sprawling three-petal bedstraw (Galium trifidum ssp. columbianum)
Spreading dogbane (Apocynum androsaemifolium)
Spreading fleabane (Erigeron divergens)
Spreading gilia (Ipomopsis polycladon)
Spreading larkspur (Delphinium patens ssp. hepaticoideum)
Spreading navarretia (Navarretia fossalis)
Spreading phlox (Phlox diffusa)
Spreading pygmyleaf (Loeflingia squarrosa)
Spreading rush (Juncus patens)
Spreading sandwort (Arenaria lanuginosa var. saxosa)
Spring draba (Draba verna)
Spring lessingia (Lessingia tenuis)
Spring vetch (Vicia sativa ssp. sativa )*
Spruce, Big-cone (Pseudotsuga macrocarpa)
Spurge,
    Abrams' (Euphorbia abramsiana)
    Arizona (Euphorbia arizonica)
    Beetle (Euphorbia eriantha)
    Bush (Euphorbia characias)*
    Caper (Euphorbia lathyris)*
    Carrizo Mountain (Euphorbia pediculifera)
    Cliff (Euphorbia misera)
    Dune (Euphorbia ocellata ssp. arenicola)
    Mojave (Euphorbia schizoloba)
    Parish's (Euphorbia parishii)
    Parry's (Euphorbia parryi)
    Petty (Euphorbia peplus)*
    Prostrate (Euphorbia prostrata)*
    Red-gland (Euphorbia melanadenia)
    Small-seeded (Euphorbia polycarpa)
    Sonoran (Euphorbia micromera)
    Terracina (Euphorbia terracina)*
    Thyme-leaved (Euphorbia serpyllifolia ssp. serpyllifolia)
    Warty (Euphorbia spathulata)
    Woodland (Euphorbia lurida)
    Yuma (Euphorbia setiloba)
Squawbush, see Skunkbrush
Squirreltail,
    California (Elymus elymoides ssp. californicus)
    Short-leaved (Elymus elymoides ssp. brevifolius)
St. Catherine's lace (Eriogonum giganteum)
St. John's wort, Scouler's (Hypericum scouleri)
Stansbury phlox (Phlox stansburyi ssp. stansburyi)
Star gilia (Gilia stellata)
Star lily (Toxicoscordion fremontii)
Star thistle, Yellow (Centaurea solstitialis)*
Star-flowered bedstraw (Galium stellatum)
Star-flowered false solomon's seal (Maianthemum stellatum)
Starwort,
    Meadow (Stellaria longipes ssp. longipes)
    Northern (Stellaria calycantha)
    Sticky (Pseudostellaria jamesiana)
Stemless evax (Hesperevax acaulis var. ambusticola)
Stemless mudwort (Limosella acaulis)
Stephanomeria,
    Chicory-leaved (Stephanomeria cichoriacea)
    Narrow-leaved (Stephanomeria tenuifolia)
Stephens' beardtongue (Penstemon stephensii)
Stickleaf (Mentzelia micrantha)
Stickseed (Lappula redowskii var. cupulata)
Sticky Chinese houses (Collinsia tinctoria)
Sticky cinquefoil
    Coastal (Drymocallis glandulosa var. wrangelliana)
    Double-toothed (Drymocallis glandulosa var. reflexa)
    Inland (Drymocallis glandulosa var. glandulosa)
    Single-toothed (Drymocallis glandulosa var. viscida)
Sticky dudleya (Dudleya viscida)
Sticky fagonia (Fagonia pachyacantha)
Sticky false-gilia (Allophyllum glutinosum)
Sticky goldback fern (Pentagramma triangularis ssp. viscosa)
Sticky lessingia (Lessingia glandulifera var. glandulifera)
Sticky madia (Madia gracilis)
Sticky monkeyflower (Mimulus aurantiacus)
Sticky phacelia (Phacelia viscida)
Sticky ringstem (Anulocaulis annulatus)
Sticky sand-spurrey (Spergularia macrotheca var. macrotheca)
Sticky snakeweed (Gutierrezia microcephala)
Sticky starwort (Pseudostellaria jamesiana)
Sticky tarplant, see Graceful tarplant
Sticky-leaved rabbitbrush (Chrysothamnus viscidiflorus ssp. viscidiflorus)
Stiffbranch bird's beak (Cordylanthus rigidus var. rigidus)
Stillingia,
    Broad-leaved (Stillingia spinulosa)
    Narrow-leaved (Stillingia linearifolia)
Stinging lupine (Lupinus hirsutissimus)
Stinkweed, Mojave (Cleomella obtusifolia)
Stipa, Giant (Stipa coronata)
Stitchwort, Douglas's (Minuartia douglasii)
Stonecrop,
    Broad-leaf (Sedum spathulifolium)
    Davidson's (Sedum niveum)
Straightleaf rush (Juncus orthophyllus)
Strawberry cactus (Mammillaria dioica)
Strawberry, Wild (Fragaria vesca)
Stream orchid (Epipactis gigantea)
Streambank lotus (Hosackia oblongifolia var. oblongifolia)
Streptanthella, Longbeak (Streptanthella longirostris)
Strigose lotus (Acmispon strigosus)
Strigose sun cup (Camissonia strigulosa)
Striped adobe lily (Fritillaria striata)
Striped horsebrush (Tetradymia argyraea)
Sturdy sedge (Carex alma)
Succulent lupine, see Arroyo lupine
Suffrutescent wallflower (Erysimum suffrutescens)
Sugar bush (Rhus ovata)
Sugar pine (Pinus lambertiana)
Suksdorf's monkeyflower (Mimulus suksdorfii)
Sulphur-flowered buckwheat (Eriogonum umbellatum var. subaridum)
Sumac, Laurel (Malosma laurina)
Summer clover (Trifolium longipes ssp. hansenii)
Summer holly (Comarostaphylis diversifolia ssp. diversifolia)
Summer holly, Flat leaf (Comarostaphylis diversifolia ssp. planifolia)
Summer lupine (Lupinus formosus var. formosus)
Sun cup,
    [Common] (Camissoniopsis bistorta)
    Desert (Eremothera boothii ssp. desertorum)
    Hairy (Camissoniopsis hirtella)
    Heartleaf (Chylismia cardiophylla ssp. cardiophylla)
    Intermediate (Camissoniopsis intermedia)
    Jurupa Hills (Camissioniopsis ignota)
    Kern (Camissonia kernensis ssp. gilmanii)
    Little wiry (Camissonia pusilla)
    Longfruit (Eremothera chamaenerioides)
    Mojave (Camissonia campestris ssp. campestris)
    Narrow-leaf (Eremothera refracta)
    Palmer's (Tetrapteron palmeri)
    Robust (Camissoniopsis robusta)
    Robust heartleaf (Chylismia cardiophylla ssp. robusta)
    San Bernardino (Camissoniopsis confusa)
    Strigose (Camissonia strigulosa)
    Walker's (Chylismia walkeri ssp. tortilis)
    Wingfruit (Chylismiella pterosperma)
Sunflower,
    Algodones Dunes (Helianthus niveus ssp. tephrodes)
    Bush (Encelia californica)
    California (Helianthus californicus)
    Canyon (Venegasia carpesioides)
    Common (Helianthus annuus)
    Desert (Geraea canescens)
    Dune (Helianthus petiolaris ssp. canescens)
    Many-stem woolly (Eriophyllum multicaule)
    Nevin's woolly (Constancea nevinii)
    Slender-leaved (Helianthus gracilentus)
    Woolly (Eriophyllum lanatum var. obovatum)
Sunray (Enceliopsis nudicaulis)
Swamp knotweed (Persicaria amphibia)
Swamp saltbush (Atriplex amnicola)*
Swamp sedge (Carex senta)
Sweet acacia (Vachellia farnesiana var. farnesiana)*
Sweet alyssum (Lobularia maritima)*
Sweet fennel (Foeniculum vulgare)*
Sweet pea,
    Canyon (Lathyrus vestitus var. vestitus)
    Perennial (Lathyrus latifolius)*
Sweetbush (Bebbia juncea var. aspera)
Sweet-cicely,
    [Common] (Osmorhiza brachypoda)
    Mountain (Osmorhiza berteroi)
Sweetclover,
    Yellow (Melilotus officinalis)
    White (Melilotus albus)*
Sword fern,
    Cliff (Polystichum imbricans ssp. curtum)
    Western (Polystichum munitum)
Sycamore, Western (Platanus racemosa)
Syntrichopappus, Fremont's (Syntrichopappus fremontii)

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