Quailbush (Atriplex lentiformis)
Quaking aspen (Populus tremuloides)
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)*
Rabbit thorn (Lycium pallidum var. oligospermum)
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)
Rancheria clover (Trifolium albopurpureum)
Ranger's buttons (Angelica
capitellata)
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 rubens)*
Redbud, Western (Cercis
occidentalis)
Red bush monkeyflower (Diplacus puniceus)
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 Canyon monkeyflower (Erythranthe rhodopetra)
Red Rock tarplant (Deinandra arida)
Red-root cryptantha (Eremocarya micrantha var. micrantha)
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)*
Red-stemmed monkeyflower (Erythranthe
rubella)
Redstem spring beauty (Claytonia rubra ssp. rubra)
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 (Johnstonella costata)
Ricegrass, Sand (Stipa hymenoides)
Rigid cryptantha (Cryptantha juniperensis)
Rigid fiddleneck (Amsinckia retrorsa)
Rigid hedge-nettle (Stachys rigida)
Rigid spineflower (Chorizanthe rigida)
Ring-stemmed bastard-sage (Eriogonum wrightii var. membranaceum)
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 (Aphyllon validum)
Rock-cress,
Arching (Boechera arcuata)
Beautiful (Boechera pulchra)
Bristly-leaved (Boechera
rectissima)
Broad-seeded (Boechera platysperma)
California (Boechera californica)
Mountain (Boechera retrofracta X)
Parish's (Boechera
parishii)
Perennial (Boechera
perennans)
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)
Rock-jasmine monkeyflower (Erythranthe androsacea)
Rock lady (Holmgrenanthe petrophila)
Rock melic (Melica stricta)
Rock mustard (Halimolobos jaegeri)
Rock-nettle,
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 thompsonii)
Ross's sedge (Carex rossii)
Rosy apricot mallow (Sphaeralcea ambigua var. rosacea)
Rosy gilia (Gilia sinuata)
Rosy pussytoes (Antennaria rosea ssp.
confinis)
Rosy spinystar (Escobaria 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 (Oreocarya flavoculata)
Round-fruited bladderpod (Cleomella arborea var. globosa)
Round-fruit yellowcress (Rorippa sphaerocarpa)
Roundleaf geranium (Geranium rotundifolium)*
Roundleaf leather root (Hoita orbicularis)
Roundleaf oxytheca (Oxytheca perfoliata)
Round-leaved boykinia (Boykinia
rotundifolia)
Round-leaved bush mallow (Malacothamnus
orbiculatus)
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)
Cooper's (Juncus cooperi)
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, Peak (Crocanthemum scoparium var. vulgare)
Russian knapweed (Rhaponticum repens)*
Russian thistle (Salsola tragus)*
Rusty-haired popcorn flower (Plagiobothrys
nothofulvus)
Rusty slender sedge (Carex subfusca)
Rydberg's horkelia (Horkelia rydbergii)
Ryegrass (Festuca perennis)*
Sacapellote (Acourtia microcephala)
Sacred datura (Datura
wrightii)
Safflower (Carthamus tinctorius)*
Sage,
Black (Salvia
mellifera)
Blue (Salvia dorrii var. dorrii)
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)
Hairy blue (Salvia
dorrii var. pilosa)
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)
Island (Artemisia nesiotica)
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 (Extriplex
californica)
Coulter's (Atriplex coulteri)
Four-wing (Atriplex
canescens var. canescens)
Pacific (Atriplex
pacifica)
Parry's (Atriplex parryi)
Shadscale (Atriplex
confertifolia)
Silverscale (Atriplex argentea)
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 pacifica var. pacifica)
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 (Erythranthe
exigua)
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)
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)
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 Diego yerba santa (Eriodictyon trichocalyx var. lanatum)
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 ricegrass (Stipa hymenoides)
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,
Chaparral (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 (Sabulina pusilla)
Bear Valley (Eremogone
ursina)
Brittle (Sabulina 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)
San Felipe dyssodia (Adenophyllum
porophylloides)
San Fernando Valley spineflower (Chorizanthe
parryi var. fernandina)
San Gabriel beardtongue (Penstemon
labrosus)
San Gabriel bedstraw (Galium grande)
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)
Sanicle,
Pacific (Sanicula
crassicaulis)
Poison (Sanicula
bipinnata)
Purple (Sanicula
bipinnatifida)
Sierra (Sanicula
graveolens)
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)
Santa Ana River woolstar (Eriastrum
densifolium ssp. sanctorum)
Santa Barbara Island buckwheat (Eriogonum giganteum var. compactum)
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 bush mallow (Malacothamnus fasciculatus var. nesioticus)
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 ssp. 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 (Erythranthe
cardinalis)
Scarlet pimpernel (Lysimachia 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-blite,
Estuary (Suaeda
esteroa)
Woolly (Suaeda
taxifolia)
Seacliff buckwheat (Eriogonum
parvifolium)
Sea dahlia (Leptosyne
maritima)
Sea fig (Carpobrotus chilensis)*
Sea-lavender (Limonium californicum)
Sea-pink, California (Armeria maritima
ssp. californica)
Searls' prairie clover (Dalea searlsiae)
Sea rocket (Cakile maritima)*
Seashore bentgrass (Agrostis pallens)
Seaside brome (Bromus sitchensis var. maritimus)
Seaside daisy (Erigeron
glaucus)
Seaside fiddleneck (Amsinckia spectabilis
var. spectabilis)
Seaside petunia, see Wild petunia
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)
Tall flat (Cyperus
eragrostis)
Triangular-fruit (Carex
triquetra)
Western rough (Carex senta)
Woolly (Carex pellita)
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-flowered woolstar (Eriastrum sapphirinum ssp. dasyanthum)
Shaggy-haired alumroot (Heuchera
hirsutissima)
Shaggy hawkweed (Hieracium horridum)
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)*
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)
Shinyleaf sandpaper plant (Petalonyx nitidus)
Shiny lomatium (Lomatium lucidum)
Shiny peppergrass (Lepidium nitidum)
Shockley's goldenheads (Acamptopappus
shockleyi)
Shockley's prickleleaf (Hecastocleis
shockleyi)
Shockley's rock-cress (Boechera shockleyi)
Shooting star,
Alpine (Primula
tetrandra)
[Common] (Primula
clevelandii var. clevelandii)
Foothill (Primula
hendersonii)
Fragrant (Primula fragrans)
Island (Primula
clevelandii ssp. insularis)
Shore grass (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 (Aphyllon
parishii ssp. brachylobum)
Shortpod mustard (Hirschfeldia
incana)*
Shortray fleabane (Erigeron lonchophyllus)
Short-stemmed bastard sage (Eriogonum wrightii var. subscaposum)
Short-winged deerweed (Acmispon glaber
var. brevialatus)
Showy Brewer's lupine (Lupinus breweri
var. grandiflorus)
Showy cryptantha (Cryptantha muricata var. muricata)
Showy cycladenia (Cycladenia humilis
var. venusta)
Showy gilia (Gilia cana ssp. speciformis)
Showy island snapdragon (Gambelia
speciosa)
Shrubby brickellbush (Brickellia
frutescens)
Shrubby interior live oak (Quercus
wislizeni var. frutescens)
Shrubby mallow (Abutilon abutiloides)*
Shrub live oak (Quercus turbinella)
Sibbaldia (Sibbaldia procumbens)
Siberian water-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 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,
Coastal (Pentagramma viscosa)
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 (Leucosyris arida)
Silverleaf horse-nettle (Solanum
elaeagnifolium)*
Silver lotus (Acmispon argophyllus var. argophyllus)
Silver puffs (Uropappus
lindleyi)
Silverscale saltbush (Atriplex argentea)
Silver senna (Senna artemisioides)*
Silverweed
Common (Potentilla anserina ssp. anserina)
Pacific
(Potentilla anserina ssp. pacific)
Silver wormwood (Artemisia ludoviciana ssp. ludoviciana)
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 grass (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 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 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 spiderling (Boerhavia triquetra var. intermedia)
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-flower baby blue eyes (Nemophila menziesii
var. integrifolia)
Smallflower bluecurls (Trichostema
micranthum)
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 (Hooveria
parviflora)
Small-flowered tamarisk (Tamarix
parviflora)*
Smallflower monkeyflower (Erythranthe inconspicua)
Smallflower notchleaf phacelia (Phacelia
crenulata var. minutiflora)
Smallflower threadplant (Nemacladus
ramosissimus)
Smallflower woodland star (Lithophragma parviflorum var. parviflorum)
Small-head field clover (Trifolium
microcephalum)
Small horseweed (Erigeron bonariensis)*
Small-leaved cream bush (Holodiscus
discolor var. microphyllus)
Small-leaved nama (Nama pusillum)
Small-leaved rose (Rosa minutifolia)
Small-seeded spurge (Euphorbia polycarpa)
Small water-plantain buttercup (Ranunculus
alismifolius var. alismellus)
Small wirelettuce (Stephanomeria exigua ssp. exigua)
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-fruited sedge (Carex heteroneura)
Smooth many-flowered linanthus (Leptosiphon
floribundus ssp. glaber)
Smooth scouring rush (Equisetum laevigatum)
Smooth showy penstemon (Penstemon spectabilis
var. spectabilis)
Smooth-stemmed fagonia (Fagonia
laevis)
Smooth tarplant (Centromadia pungens ssp. laevis)
Smooth willow-herb (Epilobium glaberrimum
ssp. glaberrimum)
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
thompsonii)
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)
Snowberry,
Creeping (Symphoricarpos
mollis)
Fragrant (Symphoricarpos
longiflorus)
Mountain (Symphoricarpos
rotundifolius var. parishii)
White (Symphoricarpos albus var. laevigatus)
Snowdrop bush (Styrax redivivus)
Snow plant (Sarcodes
sanguinea)
Soap plant,
[Common] (Chlorogalum
pomeridianum var. pomeridianum)
Small-flowered (Hooveria parviflora)
Soda straw (Angelica lineariloba)
Soft arnica (Arnica mollis)
Soft chess (Bromus hordeaceus)*
Soft-leaved paintbrush (Castilleja
mollis)
Solitary-leaved alkali goldenbush (Isocoma acradenia
var. eremophila)
Solomon's seal
False (Maianthemum racemosum)
Star-flowered false (Maianthemum stellatum)
Sonoran maiden fern (Pelazoneuron puberulum var. sonorensis)
Sonoran spurge (Euphorbia micromera)
Sourclover (Melilotus indicus)*
Southern alpine buckwheat (Eriogonum
kennedyi var. alpigenum)
Southern bluecurls (Trichostema austromontanum
ssp. austromontanum)
Southern bush monkeyflower (Diplacus australis)
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
albifrons 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 Sierra bush monkeyflower (Diplacus calycinus)
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 menodora (Menodora spinescens)
Spiny rush (Juncus acutus ssp. leopoldii)
Spinystar,
Alverson's (Escobaria alversonii)
Desert (Escobaria chlorantha)
Rosy (Escobaria vivipara var. rosea)
Spiraea, Rock (Petrophyton caespitosum)
Splendid mariposa lily (Calochortus
splendens)
Splendid woodland-gilia (Saltugilia splendens ssp. 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-parsley (Cymopterus aboriginum)
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)
Stansbury phlox (Phlox stansburyi ssp. stansburyi)
Star-flowered bedstraw (Galium
stellatum)
Star-flowered false solomon's seal (Maianthemum
stellatum)
Star gilia (Gilia stellata)
Star lily (Toxicoscordion
fremontii)
Star thistle, Yellow (Centaurea solstitialis)*
Starwort,
Meadow (Stellaria
longipes ssp. longipes)
Northern (Stellaria calycantha)
Sticky (Schizotechium
jamesianum)
Statice (Limonium sinuatum)*
St. Catherine's lace (Eriogonum giganteum var. giganteum)
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 geraea (Geraea viscida)
Sticky-leaved rabbitbrush (Chrysothamnus
viscidiflorus ssp. viscidiflorus)
Sticky lessingia (Lessingia glandulifera
var. glandulifera)
Sticky madia (Madia
gracilis)
Sticky phacelia
[Common]
(Phacelia
viscida var. viscida)
White sticky phacelia (Phacelia viscida var. albiflora)
Sticky ringstem (Anulocaulis annulatus)
Sticky sand-spurrey (Spergularia macrotheca
var. macrotheca)
Sticky snakeweed (Gutierrezia microcephala)
Sticky starwort (Schizotechium jamesianaum)
Sticky tarplant, see Graceful tarplant
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)
St. John's wort, Scouler's (Hypericum
scouleri)
Stonecrop,
Broad-leaf (Sedum
spathulifolium)
Davidson's (Sedum
niveum)
Straightleaf rush (Juncus orthophyllus)
Strawberry cactus (Mammillaria dioica)
Strawberry, Wild (Fragaria
vesca)
Streambank lotus (Hosackia oblongifolia
var. oblongifolia)
Stream orchid (Epipactis gigantea)
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 (Erythranthe
suksdorfii)
Sulphur-flowered buckwheat (Eriogonum
umbellatum var. subaridum)
Sumac, Laurel (Malosma
laurina)
Summer clover (Trifolium longipes ssp. hansenii)
Summer-holly,
Flat leaf
(Comarostaphylis
diversifolia ssp. planifolia)
Varied-leaf (Comarostaphylis diversifolia ssp. diversifolia)
Summer lupine (Lupinus formosus var. formosus)
Sun cup,
California (Eulobus californicus)
Common (Camissoniopsis
bistorta)
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)*
Sweet
acacia (Vachellia farnesiana var. farnesiana)*
Sweet alyssum (Lobularia maritima)*
Sweetbush (Bebbia juncea
var. aspera)
Sweet-cicely,
Common (Osmorhiza
brachypoda)
Mountain (Osmorhiza
berteroi)
Sweetclover,
White (Melilotus
albus)*
Yellow (Melilotus
officinalis)*
Sweet fennel (Foeniculum vulgare)*
Sweet pea,
Canyon (Lathyrus
vestitus var. vestitus)
Perennial (Lathyrus
latifolius)*
Sword fern,
Cliff (Polystichum
imbricans ssp. curtum)
Western (Polystichum
munitum)
Sycamore, Western (Platanus racemosa)
Syntrichopappus, Fremont's (Syntrichopappus
fremontii) |