| Acanthomintha lanceolata | Santa Clara thornmint | Lamiaceae |
| Acer macrophyllum | big-leaf maple | Aceraceae |
| Achillea millefolium | common yarrow, yarrow | Asteraceae |
| Achyrachaena mollis | blow-wives | Asteraceae |
| Adenostoma fasciculatum | chamise, greasewood | Rosaceae |
| Adiantum capillus-veneris | southern maidenhair, Venus-hair fern | Pteridaceae |
| Adiantum jordanii | California maidenhair | Pteridaceae |
| Aesculus californica | California buckeye | Hippocastanaceae |
| Agoseris grandiflora | California dandelion, large-flowered agoseris | Asteraceae |
| Agoseris heterophylla | annual dandelion, mountain dandelion, annual agoseris | Asteraceae |
| Agrostis microphylla | small-leaf bent grass | Poaceae |
| *Agrostis semiverticillata | whorled bent grass | Poaceae |
| Agrostis viridis | whorled bent grass | Poaceae |
| Aira caryophyllea | silver European hair grass | Poaceae |
| Alcea rosea | holly-hock | Malvaceae |
| *Alchemilla occidentalis | western dew cup, western lady's mantle | Rosaceae |
| Alisma plantago-aquatica | common water plantain | Alismataceae |
| *Alisma triviale | common water plantain | Alismataceae |
| Allium amplectens | paper onion, narrow-leaf onion | Liliaceae |
| Allium cratericola | crater onion | Liliaceae |
| Allium diabloense | fringed onion | Liliaceae |
| Allium falcifolium | sickle-leaf onion | Liliaceae |
| *Allium fimbriatum var. diabloense | fringed onion | Liliaceae |
| Allium peninsulare | peninsular onion | Liliaceae |
| Allium serra | serrated onion, pom-pon onion | Liliaceae |
| *Allium serratum | serrated onion, pom-pon onion | Liliaceae |
| Allium unifolium | clay onion, one-leaf onion | Liliaceae |
| Allophyllum gilioides | blue false gilia, purple gilia, straggling gilia | Polemoniaceae |
| Alnus rhombifolia | white alder | Betulaceae |
| *Althaea rosea | holly-hock | Malvaceae |
| Amaranthus albus | tumbleweed | Amaranthaceae |
| Amaranthus californicus | California amaranth | Amaranthaceae |
| *Amelanchier pallida | Utah serviceberry, western serviceberry | Rosaceae |
| Amelanchier utahensis | Utah serviceberry, western serviceberry | Rosaceae |
| *Amsinckia intermedia | common fiddleneck, intermediate fiddleneck | Boraginaceae |
| Amsinckia mensiesii var. intermedia | common fiddleneck, intermediate fiddleneck | Boraginaceae |
| Amsinckia mensiesii var. mensiesii | Menzies' fiddleneck, rancher's-fireweed | Boraginaceae |
| Anagallis arvensis | scarlet pimpernel | Primulaceae |
| Ancistrocarphus filagineus | woolly fishhooks, northern stylocline | Asteraceae |
| Angelica tomentosa | California angelica | Apiaceae |
| Anthemis cotula | mayweed, stinkweed, dog-fennel | Asteraceae |
| Anthriscus caucalis | bur-chervil | Apiaceae |
| *Anthriscus neglecta var. scandix | bur-chervil | Apiaceae |
| Antirrhinum kelloggii | lax snapdragon, blue snapdragon, twining snapdragon | Scrophulariaceae |
| Antirrhinum multiflorum | many-flowered snapdragon, sticky snapdragon | Scrophulariaceae |
| Antirrhinum vexillo-calyculatum | wiry snapdragon | Scrophulariaceae |
| Aphanes occidentalis | western dew cup, western lady's mantle | Rosaceae |
| Apiastrum angustifolium | wild celery, mock parsley | Apiaceae |
| Apium graveolens | celery | Apiaceae |
| Apocynum cannabinum | Indian hemp, clasping-leaf dogbane | Apocynaceae |
| *Apocynum sibiricum var. salignum | Indian hemp, clasping-leaf dogbane | Apocynaceae |
| Aquilegia formosa | crimson columbine, red columbine | Ranunculaceae |
| *Aquilegia formosa var. truncata | crimson columbine, red columbine | Ranunculaceae |
| Arabis breweri | Brewer's rock cress | Brassicaceae |
| Arabis glabra | tower mustard | Brassicaceae |
| Aralia californica | elk clover, California spikenard | Araliceae |
| Arbutus menziesii | madrone, Pacific mandrone | Ericaceae |
| Arceuthobium campylopodum | western dwarf mistletoe | Viscaceae |
| Arceuthobium occidentale | foothill pine dwarf mistletoe | Viscaceae |
| Arctostaphylos glandulosa | eastwood manzanita | Ericaceae |
| Arctostaphylos glauca | bigberry manzanita | Ericaceae |
| Arctostaphylos manzanita | common manzanita, Parry manzanita | Ericaceae |
| *Arenaria californica | California sandwort | Caryophyllaceae |
| *Arenaria douglasii | Douglas' sandwort | Caryophyllaceae |
| Aristolochia californica | Dutchman's pipe, California pipevine | Aristolochiaceae |
| Arnica discoidea | coast arnica, rayless arnica | Asteraceae |
| *Arnica discoidea var. alata | coast arnica, rayless arnica | Asteraceae |
| Artemisia californica | California sagebrush, coast sagebrush | Asteraceae |
| Artemisia douglasiana | mugwort | Asteraceae |
| Artemisia dracunculus | tarragon, dragon sagewort | Asteraceae |
| Asclepias californica | California milkweed, round-hooded milkweed | Asclepiadaceae |
| Asclepias fascicularis | narrow-leaf milkweed | Asclepiadaceae |
| *Asclepias mexicana | narrow-leaf milkweed | Asclepiadaceae |
| Aster chilensis | common California aster, Chilean aster | Asteraceae |
| Aster radulinus | broadleaf aster, rough-leaf aster | Asteraceae |
| Astragalus gambelianus | Gambell's dwarf locoweed, Gambel milkvetch, dwarf locoweed | Fabaceae |
| Athysanus pusillus | dwarf athysanus, sandweed | Brassicaceae |
| Atriplex lentiformis | big salt brush, quail brush | Chenopodiaceae |
| Avena barbata | slender wild oat | Poaceae |
| Avena fatua | wild oat | Poaceae |
| Azolla filiculoides | duckweed fern, water fern | Azollaceae |
| Baccharis douglasii | marsh baccharis, saltmarsh baccharis | Asteraceae |
| *Baccharis glutinosa | mule fat, seep-willow, water-wally | Asteraceae |
| Baccharis pilularis | coyotebrush, chaparral broom | Asteraceae |
| *Baccharis pilularis var. consanguinea | coyotebrush, chaparral broom | Asteraceae |
| Baccharis salicifolia | mule fat, seep-willow, water-wally | Asteraceae |
| *Baccharis viminea | mule fat, seep-willow, water-wally | Asteraceae |
| *Baeria chrysostoma | goldfields, sunshine | Asteraceae |
| Barbarea verna | scurvy grass, early winter cress | Brassicaceae |
| Berberis pinnata | California barberry, shinyleaf Oregon grape | Berberidaceae |
| Bloomeria crocea | common goldenstars | Liliaceae |
| *Bloomeria crocea var. montana | common goldenstars | Liliaceae |
| *Boisduvalia densiflora | dense-flowered willow-herb | Onagraceae |
| *Boisduvalia stricta | narrowleaf willow-herb | Onagraceae |
| Bowlesia incana | Bowlesia | Apiaceae |
| *Brassica campestris | turnip, field mustard | Brassicaceae |
| *Brassica geniculata | Mediterranean mustard, summer mustard, shortpod mustard | Brassicaceae |
| Brassica nigra | black mustard | Brassicaceae |
| Brassica rapa | turnip, field mustard | Brassicaceae |
| *Brassica rapa ssp. sylvestris | turnip, field mustard | Brassicaceae |
| Brickellia californica | California brickellbush | Asteraceae |
| Briza minor | little quaking grass | Poaceae |
| *Brodiaea capitata | blue dicks, wild hyacinth | Liliaceae |
| *Brodiaea congesta | ookow | Liliaceae |
| Brodiaea elegans | harvest brodiaea, elegant brodiaea | Liliaceae |
| *Brodiaea hyacinthina | white brodiaea, white triteleia, white hyacinth | Liliaceae |
| *Brodiaea laxa | Ithuriel's spear, wally basket, grass nuts | Liliaceae |
| *Brodiaea pulchella | blue dicks, wild hyacinth | Liliaceae |
| *Bromus breviaristatus | California brome | Poaceae |
| Bromus carinatus | California brome | Poaceae |
| *Bromus commutatus | Japanese brome | Poaceae |
| Bromus diandrus | ripgut grass, ripgut brome | Poaceae |
| Bromus hordeaceus | soft cheat grass | Poaceae |
| Bromus japonicus | Japanese brome | Poaceae |
| Bromus laevipes | chinook brome | Poaceae |
| Bromus madritensis ssp. madritensis | foxtail chess, Spanish brome | Poaceae |
| Bromus madritensis ssp. rubens | foxtail chess | Poaceae |
| *Bromus molliformis | soft cheat grass | Poaceae |
| *Bromus mollis | soft cheat grass | Poaceae |
| *Bromus racemosus | soft cheat grass | Poaceae |
| *Bromus rubens | foxtail chess | Poaceae |
| Bromus tectorum | cheat grass, downy chess | Poaceae |
| Calandrinia ciliata | red maids | Portulacaceae |
| *Calandrinia ciliata var. menziesii | red maids | Portulacaceae |
| Callitriche sp.(?) | water starwort | Callitrichaceae |
| Calochortus albus | white globe lily, fairy lanterns | Liliaceae |
| Calochortus argillosus | clay mariposa lily, superb mariposa tulip | Liliaceae |
| Calochortus luteus | yellow mariposa lily, gold nuggets | Liliaceae
| *Calochortus superbus | clay mariposa lily, superb mariposa tulip | Liliaceae |
| Calochortus venustus | butterfly mariposa lily, white mariposa lily, square mariposa tulip | Liliaceae |
| Calycadenia multiglandulosa | sticky calycadenia, sticky rosinweed | Asteraceae |
| *Calycadenia multiglandulosa ssp. robusta | sticky calycadenia, sticky rosinweed | Asteraceae |
| Calycadenia truncata | rosin weed | Asteraceae |
| Calyptridium monandrum | common calyptridium, sand-cress | Portulacaceae |
| Calystegia malacophylla ssp. pedicellata | Sierra morning glory, hairy morning glory | Convolvulaceae |
| Calystegia purpurata | purplish morning glory, climbing morning glory | Convolvulaceae |
| Calystegia subacaulis | hill morning glory | Convolvulaceae |
| Camissonia contorta | contorted evening primrose, cruciated primrose | Onagraceae |
| Camissonia graciliflora | hill sun cup | Onagraceae |
| Camissonia hirtella | self-pollinating suncup, small primrose | Onagraceae |
| Campanula exigua | chaparral harebell | Campanulaceae |
| Capsella bursa-pastoris | shepherd's purse | Brassicaceae |
| Cardamine californica | milkmaids, toothwort | Brassicaceae |
| Cardamine oligosperma | western bittercress, few-seeded bittercress | Brassicaceae |
| Cardaria draba | heart-podded hoary cress, hoary cress | Brassicaceae |
| Carduus pycnocephalus | Italian thistle | Asteraceae |
| Carduus tenuiflorus | slender-flowered thistle | Asteraceae |
| Carex nudata | torrent sedge | Cyperaceae |
| Castilleja affinis | common Indian paintbrush, Indian paintbrush, coast paintbrush | Scrophulariaceae |
| Castilleja attenuata | valley tassels | Scrophulariaceae |
| Castilleja densiflora | common owl's clover, owl's clover | Scrophulariaceae |
| Castilleja exserta | purple owl's clover, escobita | Scrophulariaceae |
| Castilleja foliolosa | wooly Indian paintbrush, wooly paintbrush, felt paintbrush | Scrophulariaceae |
| *Caucalis microcarpa | California hedge-parsley | Apiaceae |
| Ceanothus cuneatus | buckbrush | Rhamnaceae |
| Ceanothus leucodermis | chaparral whitethorn | Rhamnaceae |
| Ceanothus oliganthus var. sorediatus | Jim brush | Rhamnaceae |
| *Ceanothus sorediatus | Jim brush | Rhamnaceae |
| Centaurea calcitrapa | purple star-thistle | Asteraceae |
| Centaurea melitensis | tocalote | Asteraceae |
| Centaurea solstitialis | yellow star thistle | Asteraceae |
| Centaurium davyi | Davy's centaury | Gentianaceae |
| Cerastium glomeratum | mouse-ear chickweed, sticky chickweed | Caryophyllaceae |
| *Cerastium viscosum | mouse-ear chickweed, sticky chickweed | Caryophyllaceae |
| Ceratophyllum demersum | rigid hornwort, hornwort | Ceratophyllaceae |
| Cercis occidentalis | western redbud | Fabaceae |
| Cercocarpus betuloides | birchleaf mountain mahogany, California mountain mahogany, hard tack | Rosaceae |
| Chaenactis glabriuscula var. glabriuscula | pebble pincushion | Asteraceae |
| *Chaenactis glabriuscula var. gracilenta | inner coast range chaenactis | Asteraceae |
| Chaenactis glabriuscula var. heterocarpha | inner coast range chaenactis | Asteraceae |
| *Chaenactis tanacetifolia | inner coast range chaenactis | Asteraceae |
| *Chaetopappa exilis | meager pentachaeta | Asteraceae |
| Chamaesyce ocellata | valley spurge | Euphorbiaceae |
| Chamaesyce serpyllifolia | thyme-leaf spurge | Euphorbiaceae |
| Chamomilla suaveolens | pineapple weed | Asteraceae |
| Cheilanthes intertexta | coastal lip fern | Pteridaceae |
| Chenopodium album | lamb's quarter, pigweed | Chenopodiaceae |
| Chenopodium californicum | California goosefoot, soap plant | Chenopodiaceae |
| *Chenopodium dessicatum var. leptophylloides | desiccated goosefoot | Chenopodiaceae |
| Chenopodium murale | nettle-leaf goosefoot, sowbane, wall goosefoot | Chenopodiaceae |
| Chenopodium pratericola | desiccated goosefoot | Chenopodiaceae |
| Chlorogalum pomeridianum | common soap plant, wavy-leaf soap plant | Liliaceae |
| Chorizanthe membranacea | pink spineflower, clustered spineflower | Polygonaceae |
| *Chrysopsis oregona var. scaberrima | Oregon golden-aster, sticky Oregon golden aster | Asteraceae |
| *Chrysopsis villosa var. camphorata | hairy golden-aster, bristly golden aster | Asteraceae |
| Cichorium intybus | chicory, blue sailors | Asteraceae |
| Cirsium cymosum | peregrine thistle | Asteraceae |
| Cirsium occidentale var. venustum | Venus thistle, red thistle | Asteraceae |
| *Cirsium proteanum | Venus thistle, red thistle | Asteraceae |
| Cirsium vulgare | bull thistle | Asteraceae |
| Cistus creticus | rock rose | Cistaceae |
| *Cistus villosus | rock rose | Cistaceae |
| Clarkia affinis | small clarkia, allied clarkia, speckled clarkia | Onagraceae |
| Clarkia breweri | fairy fans, Brewer's clarkia | Onagraceae |
| Clarkia concinna ssp. automixa | Santa Clara red ribbons | Onagraceae |
| *Clarkia elegans | elegant clarkia, canyon clarkia | Onagraceae |
| Clarkia epilobioides | willow-herb clarkia, willow-herb godetia | Onagraceae |
| Clarkia modesta | diamond clarkia | Onagraceae |
| Clarkia purpurea ssp. purpurea | purple clarkia, winecup clarkia, purple godetia | Onagraceae |
| Clarkia purpurea ssp. quadrivulnera | four-spotted clarkia, four-spot, winecup clarkia | Onagraceae |
| Clarkia rubicunda | ruby chalice clarkia, farewell-to-spring, godetia | Onagraceae |
| Clarkia unguiculata | elegant clarkia, canyon clarkia | Onagraceae |
| Claytonia exigua | common claytonia | Portulacaceae |
| Claytonia gypsophiloides | candy stripes, coast range montia, Santa Lucia claytonia | Portulacaceae |
| Claytonia perfoliata | miner's lettuce, Indian lettuce | Portulacaceae |
| Clematis lasiantha | pipestems, chaparral clematis | Ranunculaceae |
| Clematis ligusticifolia | virgin's bower, yerba de chiva, western virgin's bower | Ranunculaceae |
| *Collinsia bicolor | Chinese houses, purple Chinese houses, innocence | Scrophulariaceae |
| Collinsia heterophylla | Chinese houses, purple Chinese houses, innocence | Scrophulariaceae |
| Collinsia sparsiflora | blue-eyed Mary, spinster's blue-eyed Mary | Scrophulariaceae |
| Collomia grandiflora | grand collomia, large-flowered collomia | Polemoniaceae |
| Conium maculatum | poison-hemlock | Apiaceae |
| Convolvulus arvensis | field bindweed | Convolvulaceae |
| *Convolvulus malacophylla ssp. pedicellata | Sierra morning glory, hairy morning glory | Convolvulaceae |
| *Convolvulus occidentalis var. purpurata | purplish morning glory, climbing morning glory | Convolvulaceae |
| *Convolvulus subacaulis | hill morning glory | Convolvulaceae |
| Conyza canadensis | horseweed | Asteraceae |
| Cordylanthus rigidus | stiff bird's beak, mule weed | Scrophulariaceae |
| *Corethrogyne filaginifolia | cudweed aster, California aster | Asteraceae |
| *Cuscuta campestris | western field dodder, field dodder | Cuscutaceae |
| Cornus glabrata | brown dogwood | Cornaceae |
| Crassula aquatica | water pygmyweed, pygmyweed | Crassulaceae |
| Crassula connata | pygmyweed, sand pygmyweed | Crassulaceae |
| Crepis capillaris | smooth hawksbeard | Asteraceae |
| Crypsis schoenoides | swamp grass | Poaceae |
| Cryptantha flaccida | flaccid cryptantha | Boraginaceae |
| Cryptantha intermedia | common cryptantha, intermediate cryptantha, white forget-me-not | Boraginaceae |
| Cuscuta californica | California dodder | Cuscutaceae |
| Cuscuta pentagona | western field dodder, field dodder | Cuscutaceae |
| Cynodon dactylon | Bermuda grass | Poaceae |
| Cynoglossum grande | western hound's tongue, hound's tongue | Boraginaceae |
| Cynosurus echinatus | hedgehog dogtail | Poaceae |
| Cyperus eragrostis | tall cyperus, tall flat sedge | Cyperaceae |
| Cypselea humifusa | cypselea | Aizoaceae |
| Cystopteris fragilis | brittle fern | Dryopteridaceae |
| Datisca glomerata | durango root | Datiscaceae |
| *Datura meteloides | jimsonweed, tolguacha, sacred datura | Solanaceae |
| Datura wrightii | jimsonweed, tolguacha, sacred datura | Solanaceae |
| Daucus pusillus | American carrot, rattlesnake weed | Apiaceae |
| Delphinium californicum | California larkspur | Ranunculaceae |
| Delphinium decorum | yellow-tinge larkspur, coast larkspur | Ranunculaceae |
| Delphinium hesperium | western larkspur, coast larkspur | Ranunculaceae |
| Delphinium nudicaule | red larkspur, orange larkspur, canyon delphinium | Ranunculaceae |
| Delphinium parryi | Parry's larkspur, Parry's delphinium | Ranunculaceae |
| Delphinium patens | spreading larkspur, zigzap delphinium, Indian blue larkspur | Ranunculaceae |
| Delphinium variegatum | royal larkspur, royal delphinium | Ranunculaceae |
| *Dentaria californica | milkmaids, toothwort | Brassicaceae |
| Deschampsia danthonioides | annual hair grass | Poaceae |
| Descurainia pinnata ssp. menziesii | western tansy-mustard | Brassicaceae |
| Descurainia sophia | flixweed | Brassicaceae |
| Dicentra chrysantha | golden eardrops | Papaveraceae |
| Dichelostemma capitatum | blue dicks, wild hyacinth | Liliaceae |
| Dichelostemma congestum | ookow | Liliaceae |
| *Dichelostemma pulchellum | blue dicks, wild hyacinth | Liliaceae |
| Dipsacus sativus | fuller's teasel | Dipsacaceae |
| Distichlis spicata | salt grass | Poaceae |
| Dodecatheon clevelandii ssp. patulum | lowland shooting star, padre's shooting star | Primulaceae |
| Dodecatheon hendersonii | mosquito bills, sailor caps, woodland shooting star | Primulaceae |
| Draba verna | whitlow grass, spring whitlow grass | Brassicaceae |
| Dryopteris arguta | coastal wood fern, California wood fern | Dryopteridaceae |
| Dudleya cymosa | rock lettuce, spreading dudleya, common dudleya | Crassulaceae |
| Echinochloa crus-galli | barnyard grass | Poaceae |
| *Echinocystis fabaceus | wild cucumber, California manroot, common manroot | Cucurbitaceae |
| Elatine sp.(?) | waterwort | Elatinaceae |
| Eleocharis macrostachya | pale spikerush | Cyperaceae |
| *Eleocharis palustris | wild cucumber, California manroot, common manroot | Cucurbitaceae |
| Eleocharis rostellata | beaked spikerush, walking sedge | Cyperaceae |
| Elymus glaucus | blue wild rye | Poaceae |
| Elymus multisetus | big squirreltail | Poaceae |
| Emmenanthe penduliflora | whispering bells | Hydrophyllaceae |
| *Epilobium adenocaulon var. adenocaulon | northern willow-herb, American willow-herb, common willowherb | Onagraceae |
| *Epilobium adenocaulon var. holosericeum | northern willow-herb, American willow-herb, common willowherb | Onagraceae |
| Epilobium brachycarpum | panicled willow-herb, parched fireweed | Onagraceae |
| Epilobium canum | California fuchsia | Onagraceae |
| Epilobium ciliatum | northern willow-herb, American willow-herb, common willowherb | Onagraceae |
| Epilobium densiflorum | dense-flowered willow-herb | Onagraceae |
| Epilobium minutum | minute willow-herb, threadstem fireweed | Onagraceae |
| *Epilobium paniculatum | panicled willow-herb, parched fireweed | Onagraceae |
| Epilobium torreyi | narrowleaf willow-herb | Onagraceae |
| Epipactis gigantea | stream orchid | Orchidaceae |
| Equisetum laevigatum | smooth scouring rush | Equisetaceae |
| Equisetum telmateia ssp. braunii | giant horsetail | Equisetaceae |
| *Erechtites arguta | cut-leaf coast fireweed, bushman's burnweed | Asteraceae |
| Erechtites glomerata | cut-leaf coast fireweed, bushman's burnweed | Asteraceae |
| Eremocarpus setigerus | turkey mullein, dove weed | Euphorbiaceae
| Eriastrum abramsii | Abram's eriastrum | Polemoniaceae |
| Eriastrum pluriflorum | many-flowered eriastrum | Polemoniaceae |
| Ericameria arborescens | golden fleece | Asteraceae |
| Ericameria linearifolia | interior goldenbush, narrowleaf goldenbush | Asteraceae |
| Erigeron foliosus | leafy daisy | Asteraceae |
| Erigeron petrophilus | rock daisy | Asteraceae |
| Erigeron philadelphicus | Philadelphia fleabane, Philadelphia daisy | Asteraceae |
| Eriodictyon californicum | yerba santa, mountain balm | Hydrophyllaceae |
| Eriogonum fasciculatum var. foliolosum | California buckwheat | Polygonaceae |
| Eriogonum gracile | slender woolly buckwheat, slender eriogonum | Polygonaceae |
| Eriogonum luteolum var. luteolum | slender woolly buckwheat, slender eriogonum | Polygonaceae |
| Eriogonum nudum | naked-stemmed buckwheat, tibinagua | Polygonaceae |
| Eriogonum roseum | rose buckwheat, rosy eriogonum | Polygonaceae |
| Eriogonum vimineum | wicker buckwheat, wicker-stemmed eriogonum | Polygonaceae |
| Eriogonum wrightii | Wright's eriogonum, Wright's buckwheat | Polygonaceae |
| Eriophyllum confertiflorum | golden yarrow | Asteraceae |
| Eriophyllum jepsonii | Jepson's woolly sunflower | Asteraceae |
| Erodium botrys | broadleaf filaree, long-beaked storksbill | Geraniaceae |
| Erodium brachycarpumotrys | blunt-folded filaree, Southern European stork's-bill | Geraniaceae |
| Erodium cicutarium | red-stemmed filaree, redstem storksbill | Geraniaceae |
| Erodium moschatum | whitestem filaree, whitestem storksbill | Geraniaceae |
| *Erodium obtusiplicatum | blunt-folded filaree, Southern European stork's-bill | Geraniaceae |
| Erysimum capitatum | western wallflower, Douglas' wallflower | Brassicaceae |
| Eschscholzia caespitosa | tufted poppy | Papaveraceae |
| Eschscholzia californica | California poppy | Papaveraceae |
| Euphorbia crenulata | Chinese caps | Euphorbiaceae |
| *Euphorbia ocellata | valley spurge | Euphorbiaceae |
| *Euphorbia serpyllifolia | thyme-leaf spurge | Euphorbiaceae |
| Euphorbia spathulata | reticulate-seeded spurge, spatulate-leaf spurge | Euphorbiaceae |
| *Evax acaulis | dwarf evax | Asteraceae |
| *Evax sparsiflora | erect hesperevax, erect evax | Asteraceae |
| Euthamia occidentalis | western goldenrod | Asteraceae |
| Festuca arundinacea | tall fescue | Poaceae |
| *Festuca bromoides | brome fescue | Poaceae |
| *Festuca dertonensis | brome fescue | Poaceae |
| Festuca californica | California fescue | Poaceae |
| *Festuca eastwoodae | hairy fescue | Poaceae |
| Festuca elmeri | Elmer's fescue | Poaceae |
| *Festuca grayi | hairy fescue | Poaceae:
| *Festuca megalura | foxtail fescue | Poaceae |
| *Festuca myuros | rattail fescue | Poaceae |
| *Festuca pacifica | hairy fescue | Poaceae |
| *Festuca reflexa | common hairleaf fescue | Poaceae |
| Filago gallica | narrow-leaf filago, fluffweed | Asteraceae |
| Foeniculum vulgare | fennel, sweet fennel | Apiaceae |
| *Forestiera neomexicana | desert olive, adelia | Oleaceae |
| Forestiera pubescens | desert olive, adelia | Oleaceae |
| Fraxinus dipetala | California ash | Oleaceae |
| Fritillaria affinis | checker lily, mission bells | Liliaceae |
| *Fritillaria lanceolata | checker lily, mission bells | Liliaceae |
| Galium andrewsii | phlox-leaf bedstraw | Rubiaceae |
| Galium aparine | goosegrass, cleavers | Rubiaceae |
| Galium californicum | California bedstraw | Rubiaceae |
| Galium murale | tiny bedstraw | Rubiaceae |
| *Galium nuttallii var. ovalifolium | climbing bedstraw | Rubiaceae |
| Galium parisiense | wall bedstraw | Rubiaceae |
| Galium porrigens | climbing bedstraw | Rubiaceae |
| Garrya flavescens | ashy silk-tassel | Garryaceae |
| *Garrya flavescens var. pallida | ashy silk-tassel | Garryaceae |
| Gastridium ventricosum | nit grass | Poaceae |
| Geranium bicknellii | Bicknell's geranium, Bicknell's cranesbill | Geraniaceae |
| Geranium dissectum | cut-leaf geranium, cutleaf cranesbill | Geraniaceae |
| Geranium molle | dove's-foot geranium | Geraniaceae |
| Geranium pusillum | small-flowered geranium | Geraniaceae |
| Gilia achilleifolia ssp. achilleifolia | California gilia, blue gilia | Polemoniaceae |
| Gilia achilleifolia ssp. multicaulis | many-stemmed gilia, small California gilia | Polemoniaceae |
| Gilia clivorum | slope gilia, grassland gilia | Polemoniaceae |
| *Gilia gilioides | blue false gilia, purple gilia, straggling gilia | Polemoniaceae |
| Gilia tricolor | bird's eye gilia, bird's eyes, tricolor gilia | Polemoniaceae |
| Githopsis specularioides | common blue cup | Campanulaceae |
| Glinus lotoides | glinus | Molluginaceae |
| Glycyrrhiza lepidota | wild licorice, American licorice | Fabaceae |
| Gnaphalium californicum | California everlasting, California cudweed | Asteraceae |
| Gnaphalium luteo-album | weedy cudweed | Asteraceae |
| Gnaphalium palustre | lowland cudweed | Asteraceae |
| Grindelia camporum | Great Valley gumplant | Asteraceae |
| Guillenia lasiophylla | California mustard | Brassicaceae |
| *Gutierrezia bracteata | Californis matchweed, San Joaquin matchweed | Asteraceae |
| Gutierrezia californica | Californis matchweed, San Joaquin matchweed | Asteraceae |
| *Habenaria elegans | elegant rein orchid, slender rein orchid | Orchidaceae |
| *Habenaria unalascensis | Alaska rein orchid | Orchidaceae |
| *Haplopappus arborescens | golden fleece | Asteraceae |
| *Haplopappus linearifolia | interior goldenbush, narrowleaf goldenbush | Asteraceae |
| Hedara helix | English Ivy | Araliceae
| Helenium puberulum | rosilla | Asteraceae |
| *Heleochloa schoenoides | swamp grass | Poaceae |
| Helianthella californica | California helianthella | Asteraceae |
| Helianthemum scoparium | peak rush-rose, broom-rose | Cistaceae |
| *Helianthemum scoparium var. vulgare | peak rush-rose, broom-rose | Cistaceae |
| Helianthus californicus | California sunflower | Asteraceae |
| Heliotropium curassavicum | seaside heliotrope, salt heliotrope, quail plant | Boraginaceae |
| Hemizonia congesta ssp. luzulifolia | hayfield tarweed | Asteraceae |
| Hemizonia fitchii | Fitch's spikeweed | Asteraceae |
| Hemizonia kelloggii | Kellogg's tarweed | Asteraceae |
| *Hemizonia luzulaefolia ssp. rudis | hayfield tarweed | Asteraceae |
| *Herniaria cinerea | gray rupturewort | Caryophyllaceae |
| Herniaria hirsuta ssp. cinerea | gray rupturewort | Caryophyllaceae |
| Hesperevax acaulis | dwarf evax | Asteraceae |
| Hesperevax sparsiflora var. sparsiflora | erect hesperevax, erect evax | Asteraceae |
| Hesperolinon disjunctum | disjunct dwarf flax | Linaceae |
| Hesperolinon micranthum | small-flowered dwarf flax, smallflower western flax | Linaceae |
| Heterocodon rariflorum | heterocodon, differbells | Campanulaceae
| Heteromeles arbutifolia | toyon, Christmas berry, California holly | Rosaceae |
| Heterotheca oregona var. scaberrima | Oregon golden-aster, sticky Oregon golden aster | Asteraceae |
| Heterotheca sessiliflora ssp. echioides | hairy golden-aster, bristly golden aster | Asteraceae |
| Hirschfeldia incana | Mediterranean mustard, summer mustard, shortpod mustard | Brassicaceae |
| Hoita macrostachya | leather root, California hemp | Fabaceae |
| Hoita orbicularis | round-leaf psoralea, round-leaf hoita | Fabaceae |
| Holcus lanatus | common velvet grass | Poaceae |
| Holocarpha heermannii | Heermann's tarweed, Heermann tarplant | Asteraceae |
| Holocarpha virgata | virgate tarweed, sticky tarweed, virgate tarplant | Asteraceae |
| Holodiscus discolor | ocean spray, cream bush | Rosaceae |
| Holozonia filipes | holozonia, hareleaf | Asteraceae |
| Hordeum brachyantherum ssp. brachyantherum | meadow barley | Poaceae |
| Hordeum brachyantherum ssp. californicum | California barley | Poaceae |
| *Hordeum californicum | California barley | Poaceae |
| Hordeum depressum | low barley | Poaceae |
| *Hordeum geniculatum | Mediterranean barley | Poaceae |
| *Hordeum hystrix | Mediterranean barley | Poaceae |
| *Hordeum leporinum | hare barley | Poaceae |
| Hordeum marinum ssp. gussoneanum | Mediterranean barley | Poaceae |
| Hordeum murinum ssp. leporinum | hare barley | Poaceae |
| Hypericum anagalloides | tinker's penny | Hypericaceae |
| Hypochaeris glabra | smooth cat's-ear | Asteraceae |
| Idahoa scapigera | flatpod | Brassicaceae |
| Iris macrosiphon | ground iris, bowl-tubed iris | Iridaceae |
| Isoetes howellii | Howell's quillwort | Isoetaceae |
| Isopyrum occidentale | western rue-anemone | Ranunculaceae |
| Isopyrum stipitatum | rue-anemone, Siskiyou rue-anemone | Ranunculaceae |
| Juglans californica var. hindsii | Northern California black walnut | Juglandaceae |
| *Juglans hindsii | Northern California black walnut | Juglandaceae |
| Juncus balticus | Baltic rush, wire rush | Juncaceae |
| Juncus bufonius | toad rush | Juncaceae |
| Juncus effusus var. pacificus | Pacific bog rush | Juncaceae |
| Juncus xiphioides | iris-leaf rush, iris rush | Juncaceae |
| Juniperus californica | California juniper | Cupressaceae |
| Keckiella breviflora | gaping penstemon, bush beardtongue | Scrophulariaceae |
| Keckiella corymbosa | redwood penstemon | Scrophulariaceae |
| Kickxia elatine | sharp-leaf fluellin | Scrophulariaceae |
| *Koeleria cristata | June grass | Poaceae |
| Koeleria macrantha | June grass | Poaceae |
| *Kohlrauschia velutina | hairypink, wild carnation | Caryophyllaceae |
| Lactuca saligna | willow lettuce | Asteraceae |
| Lactuca serriola | prickly lettuce, wild lettuce | Asteraceae |
| Lagophylla ramosissima | common hareleaf | Asteraceae |
| Lamarckia aurea | goldentop | Poaceae |
| Lamium amplexicaule | clasping henbit, common henbit, giraffe head | Lamiaceae |
| Lasthenia californica | goldfields, sunshine | Asteraceae |
| *Lasthenia chrysostoma | goldfields, sunshine | Asteraceae |
| Lasthenia glabrata | yellow-rayed lasthenia, smooth lasthenia, smooth goldfields | Asteraceae |
| Lathyrus jepsonii var. californicus | buff pea, bluff pea | Fabaceae |
| Lathyrus latifolius | perennial sweet pea, everlasting pea | Fabaceae |
| Lathyrus vestitus | Pacific pea, hillside pea, woodland pea | Fabaceae |
| *Lathyrus watsonii | buff pea, bluff pea | Fabaceae |
| Layia gaillardioides | woodland layia | Asteraceae |
| Layia platyglossa | tidy tips | Asteraceae |
| *Lepidium draba | heart-podded hoary cress, hoary cress | Brassicaceae |
| Lepidium nitidum | shining peppergrass, common peppergrass | Brassicaceae |
| Lessingia filaginifolia | cudweed aster, California aster | Asteraceae |
| *Lessingia germanorum var. parvula | spring lessingia | Asteraceae |
| Lessingia micradenia var. glabrata | smooth lessingia | Asteraceae |
| *Lessingia ramulosa var. glabrata | smooth lessingia | Asteraceae |
| Lessingia tenuis | spring lessingia | Asteraceae |
| Lewisia rediviva | bitterroot | Portulacaceae |
| Limnanthes douglasii | Douglas' meadowfoam, common meadowfoam | Limnanthaceae |
| Limosella acaulis | southern mudwort | Scrophulariaceae |
| Linanthus ambiguus | serpentine linanthus | Polemoniaceae |
| Linanthus androsaceus | common linanthus, false baby stars, pinklobe linanthus | Polemoniaceae |
| *Linanthus androsaceus ssp. luteus | common linanthus | Polemoniaceae |
| Linanthus bicolor | true baby stars, bicolored linanthus | Polemoniaceae |
| Linanthus ciliatus | whisker brush, bristly leaf linanthus | Polemoniaceae |
| Linanthus dichotomus | evening snow | Polemoniaceae |
| Linanthus grandiflorus | large-flower linanthus, grand linanthus, mountain phlox | Polemoniaceae |
| Linanthus liniflorus | flax-flowered linanthus | Polemoniaceae |
| Linanthus parviflorus | common linanthus | Polemoniaceae |
| Linanthus pygmaeus ssp. continentalis | pigmy linanthus | Polemoniaceae |
| Linaria canadensis | blue toadflax | Scrophulariaceae |
| *Lippia nodiflora var. rosea | lemon verbena, capeweed, mat-grass | Verbenaceae |
| Lithophragma affine | woodland star | Saxifragaceae |
| Lithophragma heterophyllum | hill starflower | Saxifragaceae |
| Lithophragma parviflorum | prairie starflower | Saxifragaceae |
| Lolium multiflorum | Italian rye grass | Poaceae |
| Lolium perenne | perennial rye grass | Poaceae |
| Lomatium californicum | California lomatium, chu-chu-pate | Apiaceae |
| Lomatium caruifolium | caraway-leaf lomatium | Apiaceae |
| Lomatium dasycarpum | lace parsnip, woolly-fruited lomatium | Apiaceae |
| Lomatium macrocarpum | sheep parsnip, large-fruited lomatium | Apiaceae |
| Lomatium nudicaule | pestle parsnip | Apiaceae |
| Lomatium utriculatum | bladder parsnip, common lomatium | Apiaceae |
| Lonicera hispidula var. vacillans | hairy honeysuckle, California honeysuckle | Caprifoliaceae |
| Lonicera interrupta | chaparral honeysuckle | Caprifoliaceae |
| Lonicera subspicata var. denudata | southern honeysuckle | Caprifoliaceae |
| *Lonicera subspicata var. johnstonii | southern honeysuckle | Caprifoliaceae |
| Lotus corniculatus | bird's foot trefoil, birdsfoot lotus, bird's-foot deerweed | Fabaceae |
| Lotus crassifolius | broadleaf lotus, buck lotus | Fabaceae |
| Lotus humistratus | hill lotus, short-podded trefoil, colchita | Fabaceae |
| Lotus micranthus | hill lotus, small-flowered lotus, miniature lotus | Fabaceae |
| Lotus purshianus | Spanish lotus, Spanish clover | Fabaceae |
| Lotus salsuginosus | coastal trefoil, hookbeak lotus | Fabaceae |
| Lotus scoparius | deerweed, California broom | Fabaceae |
| Lotus strigosus | hairy lotus, strigose lotus | Fabaceae |
| *Lotus subpinnatus | California lotus, Chile trefoil, hill lotus | Fabaceae |
| Lotus wrangelianus | California lotus, Chile trefoil, hill lotus | Fabaceae |
| Lupinus albifrons var. albifrons | silver lupine, white-foliaged lupine | Fabaceae |
| Lupinus albifrons var. collinus | Bay Area silver lupine | Fabaceae |
| Lupinus bicolor | miniature lupine, dove lupine, blue and white lupine | Fabaceae |
| *Lupinus densiflorus | dense-flowered lupine, gully lupine, whitewhorl lupine | Fabaceae |
| Lupinus latifolius | broadleaf lupine | Fabaceae |
| Lupinus microcarpus var. densiflorus | dense-flowered lupine, gully lupine, whitewhorl lupine | Fabaceae |
| Lupinus microcarpus var. microcarpus | valley lupine, chick lupine | Fabaceae |
| Lupinus nanus | Douglas' lupine | Fabaceae |
| *Lupinus nanus ssp. latifolius | Douglas' lupine | Fabaceae |
| *Lupinus ruber | valley lupine, chick lupine | Fabaceae |
| *Lupinus subvexus | valley lupine, chick lupine | Fabaceae |
| Lupinus succulentus | arroyo lupine | Fabaceae |
| *Lupinus vallicola ssp. apricus | Douglas' lupine | Fabaceae |
| Luzula comosa | wood rush | Juncaceae |
| *Luzula subsessilis | wood rush | Juncaceae |
| Lycopersicon esculentum | tomato | Solanaceae |
| Lythrum californicum | California loosestrife | Lythraceae |
| Lythrum hyssopifolia | grass poly, hyssop loosestrife | Lythraceae |
| Madia elegans | common madia, elegant madia, springtime madia | Asteraceae |
| Madia exigua | threadstem madia, small tarweed, pygmy madia | Asteraceae |
| Madia gracilis | slender madia, slender tarweed | Asteraceae |
| *Mahonia pinnata | California barberry, shinyleaf Oregon grape | Berberidaceae |
| Malacothamnus fasciculatus | chaparral mallow | Malvaceae |
| Malacothrix floccifera | woolly malacothrix | Asteraceae |
| *Malus pumila | apple | Rosaceae |
| Malus sylvestris | apple | Rosaceae |
| Malva nicaeensis | bull mallow | Malvaceae |
| Malva parviflora | cheese weed, little mallow | Malvaceae |
| Malvella leprosa | alkali mallow, whiteweed | Malvaceae |
| Marah fabaceus | wild cucumber, California manroot, common manroot | Cucurbitaceae |
| Marrubium vulgare | horehound | Lamiaceae |
| Marsilea vestita | clover fern, hairy pepperwort | Marsileaceae |
| *Matricaria matricarioides | pineapple weed | Asteraceae |
| Meconella denticulata | small-flowered meconella | Papaveraceae |
| Medicago lupulina | black medick, yellow trefoil | Fabaceae |
| Medicago polymorpha | California bur clover, bur clover, toothed medick | Fabaceae |
| Melica californica | California melic | Poaceae |
| Melica imperfecta | coast range melic | Poaceae |
| Melica torreyana | Torrey melic | Poaceae |
| Melilotus indica | sour clover, yellow sweet clover, Indian melilot | Fabaceae |
| Melissa officinalis | bee balm, garden balm, lemon balm | Lamiaceae |
| Mentha pulegium | pennyroyal | Lamiaceae |
| Mentha spicata | spearmint | Lamiaceae |
| Mentzelia lindleyi | Lindley's blazing star | Loasaceae |
| Micropus californicus | slender cottonweed, Q-tips | Asteraceae |
| Microseris douglasii | Douglas' microseris, silver puffs | Asteraceae |
| Microseris elegans | elegant microseris | Asteraceae |
| *Microseris heterocarpa | derived microseris | Asteraceae |
| *Microseris lindleyi | silver puffs | Asteraceae |
| *Microseris linearifolia | silver puffs | Asteraceae |
| *Microsteris gracilis | slender phlox, annual phlox | Polemoniaceae |
| *Mimetanthe pilosa | downy monkeyflower | Scrophulariaceae |
| Mimulus aurantiacus | sticky monkeyflower, bush monkeyflower | Scrophulariaceae |
| Mimulus bolanderi | Bolander's monkeyflower | Scrophulariaceae |
| Mimulus cardinalis | scarlet monkeyflower, crimson monkeyflower | Scrophulariaceae |
| Mimulus congdonii | Congdon's monkeyflower | Scrophulariaceae |
| Mimulus douglasii | purple monkeyflower, purple mouse-ears, chinless mouse-ears, brownies | Scrophulariaceae |
| Mimulus floribundus | long-flowering monkeyflower, floriferous monkeyflower | Scrophulariaceae |
| Mimulus guttatus | common monkeyflower, seep-spring monkeyflower, yellow monkeyflower | Scrophulariaceae |
| Mimulus pilosus | downy monkeyflower | Scrophulariaceae |
| Minuartia californica | California sandwort | Caryophyllaceae |
| Minuartia douglasii | Douglas' sandwort | Caryophyllaceae |
| Monardella villosa | coyote mint, common coyote mint | Lamiaceae |
| Monolopia gracilens | woodland monolopia | Asteraceae |
| Montia fontana | water chickweed, blinks, water montia | Portulacaceae |
| *Montia fontana ssp. amporitana | water chickweed, blinks, water montia | Portulacaceae |
| *Montia hallii | water chickweed, blinks, water montia | Portulacaceae |
| *Montia gypsophiloides | candy stripes, coast range montia, Santa Lucia claytonia | Portulacaceae |
| *Montia perfoliata | miner's lettuce, Indian lettuce | Portulacaceae |
| *Montia perfoliata var. nubigena | candy stripes, coast range montia, Santa Lucia claytonia | Portulacaceae |
| *Montia spathula (all varieties) | common claytonia | Portulacaceae |
| Muscari botryoides | grape hyacinth | Liliaceae |
| Myriophyllum sibiricum | spiked water-milfoil, water milfoil | Haloragaceae |
| *Myriophyllum spicatum ssp. exalbescens | spiked water-milfoil, water milfoil | Haloragaceae |
| Nasella cernua | nodding needle grass | Poaceae |
| Nasella lepida | foothill needle grass | Poaceae |
| Nasella pulchra | purple needle grass | Poaceae |
| *Nasturtium officinale | watercress | Brassicaceae |
| Navarretia atractyloides | holly-leaf navarretia | Polemoniaceae |
| Navarretia intertexta | needle-leaf navarretia | Polemoniaceae |
| Navarretia mellita | honey-scented navarretia | Polemoniaceae |
| Navarretia squarrosa | skunkweed | Polemoniaceae |
| Nemophila menziesii ssp. atomaria | white baby-blue-eyes | Hydrophyllaceae |
| Nemophila parviflora | small-flowered nemophila | Hydrophyllaceae |
| Nicotiana acuminata var. multiflora | many-flowered tobacco | Solanaceae |
| Oemleria cerasiformis | oso berry | Rosaceae |
| *Oenothera cruciata | contorted evening primrose, cruciated primrose | Onagraceae |
| *Oenothera graciliflora | hill sun cup | Onagraceae |
| Olea europaea | common olive | Oleaceae |
| Orobanche californica ssp. californica | California broomrape | Orobanchaceae |
| Orobanche californica ssp. jepsonii | Jepson's broomrape | Orobanchaceae |
| Orobanche fasciculata | clustered broomrape | Orobanchaceae |
| *Orobanche fasciculata var. franciscana | clustered broomrape | Orobanchaceae |
| *Orobanche grayana var. jepsonii | Jepson's broomrape | Orobanchaceae |
| Orobanche uniflora | naked broomrape | Orobanchaceae |
| *Orthocarpus attenuatus | valley tassels | Scrophulariaceae |
| *Orthocarpus densiflorus | common owl's clover, owl's clover | Scrophulariaceae |
| *Orthocarpus eriantha | butter-and-eggs, Johnny-tuck, yellow Johnny-tuck | Scrophulariaceae |
| *Orthocarpus purpurascens | purple owl's clover, escobita | Scrophulariaceae |
| *Orthocarpus pusilla | dwarf owl's clover | Scrophulariaceae |
| *Oryzopsis miliacea | smilo grass | Poaceae |
| *Osmaronia cerasiformis | oso berry | Rosaceae |
| Osmorhiza brachypoda | California sweet-cicely | Apiaceae |
| Osmorhiza chilensis | mountain sweet-cicely, wood cicely | Apiaceae |
| *Osmorhiza nuda | mountain sweet-cicely, wood cicely | Apiaceae |
| *Parietaria floridana | pellitory | Urticaceae |
| Parietaria hespera | pellitory | Urticaceae |
| Paspalum dilatatum | dallis grass | Poaceae |
| Paspalum distichum | knot grass | Poaceae |
| Pectocarya pusilla | little pectocarya | Boraginaceae |
| Pedicularis densiflora | Indian warrior | Scrophulariaceae |
| Pellaea andromedifolia | coffee fern | Pteridaceae |
| Pellaea mucronata | bird's-foot fern, bird's-foot cliff-brake | Pteridaceae |
| *Penstemon breviflorus | gaping penstemon, bush beardtongue | Scrophulariaceae |
| *Penstemon corymbosus | redwood penstemon | Scrophulariaceae |
| Penstemon grinnellii ssp. scrophularioides | Grinnell's penstemon | Scrophulariaceae |
| Penstemon heterophyllus | foothill penstemon | Scrophulariaceae |
| Pentachaeta exilis | meager pentachaeta | Asteraceae |
| Pentagramma triangularis | goldenback fern | Pteridaceae |
| Perideridia californica | California yampah | Apiaceae |
| Perideridia kelloggii | Kellogg's yampah | Apiaceae |
| Petrorhagia dubia | hairypink, wild carnation | Caryophyllaceae |
| Phacelia breweri | Brewer's phacelia | Hydrophyllaceae |
| Phacelia cicutaria | caterpillar phacelia | Hydrophyllaceae |
| Phacelia imbricata | imbricate phacelia,rock phacelia | Hydrophyllaceae |
| Phacelia phacelioides | Mount Diablo phacelia | Hydrophyllaceae |
| Phacelia ramosissima | branching phacelia, branched phacelia | Hydrophyllaceae |
| Phacelia rattanii | Rattan's phacelia | Hydrophyllaceae |
| Phalaris aquatica | harding grass | Poaceae |
| Phalaris arundinacea | reed canary grass | Poaceae |
| Phalaris minor | little-seed canary grass | Poaceae |
| Phleum pratense | cultivated timothy | Poaceae |
| Phlox gracilis | slender phlox, annual phlox | Polemoniaceae |
| Pholistoma auritum | fiesta flower, blue fiesta flower | Hydrophyllaceae |
| Phoradendron villosum | oak mistletoe | Viscaceae |
| *Photinia arbutifolia | toyon, Christmas berry, California holly | Rosaceae |
| Phyla nodiflora | lemon verbena, capeweed, mat-grass | Verbenaceae |
| Physocarpus capitatus | Pacific ninebark, western ninebark | Rosaceae |
| Pickeringia montana | chaparral pea | Fabaceae |
| Picris echioides | bristly ox-tongue | Asteraceae |
| Pinus ponderosa | ponderosa pine, western yellow pine | Pinaceae |
| Pinus sabiniana | gray pine, foothill pine | Pinaceae |
| Piperia elegans | elegant rein orchid, slender rein orchid | Orchidaceae |
| Piperia unalascensis | Alaska rein orchid | Orchidaceae |
| Piptatherum miliaceum | smilo grass | Poaceae |
| *Pityrogramma triangularis | goldenback fern | Pteridaceae |
| Plagiobothrys bracteatus | bracted popcorn flower | Boraginaceae |
| Plagiobothrys canescens | valley popcorn flower | Boraginaceae |
| Plagiobothrys nothofulvus | popcorn flower, foothill snowdrops | Boraginaceae |
| Plagiobothrys fulvus | fulvous popcorn flower | Boraginaceae |
| *Plagiobothrys fulvus var. campestris | fulvous popcorn flower | Boraginaceae |
| Plantago erecta | California plantain, dwarf plantain | Plantaginaceae |
| *Plantago hookeriana var. californica | California plantain, dwarf plantain | Plantaginaceae |
| Plantago lanceolata | English plantain | Plantaginaceae |
| Plantago major | common plantain | Plantaginaceae |
| Platanus racemosa | California sycamore, western sycamore | Platanaceae |
| Platystemon californicus | cream cups | Papaveraceae |
| Plectritis brachystemon | pink plectritis, pale plectritis, short-spurred plectritis, cornsalad | Valerianaceae |
| Plectritis ciliosa | long-spurred plectritis | Valerianaceae |
| *Plectritis congesta ssp. brachystemon | pink plectritis, pale plectritis, short-spurred plectritis, corn salad | Valerianaceae |
| Plectritis macrocera | longhorn plectritis, white plectritis, rotund plectritis | Valerianaceae |
| Poa annua | annual blue grass | Poaceae |
| *Poa bolanderi ssp. howellii | Howell's blue grass | Poaceae |
| Poa bulbosa | bulbous blue grass | Poaceae |
| Poa howellii | Howell's blue grass | Poaceae |
| Poa pratensis | Kentucky blue grass | Poaceae |
| *Poa scabrella | one-sided blue grass | Poaceae |
| Poa secunda | one-sided blue grass | Poaceae |
| Pogogyne serpylloides | thyme-like pogogyne | Lamiaceae |
| Polygonum arenastrum | common knotweed, doorweed, yard knotweed | Polygonaceae |
| Polygonum lapathifolium | willow-weed | Polygonaceae |
| Polygonum punctatum | water smartweed | Polygonaceae |
| Polypodium californicum | California polypody | Polypodiaceae |
| Polypogon australis | Chilean beard grass | Poaceae |
| *Polypogon interruptus | Chilean beard grass | Poaceae |
| Polypogon monspeliensis | annual beard grass | Poaceae |
| Polystichum munitum (or P.imbricans ?) | western sword fern | Dryopteridaceae |
| Populus balsamifera ssp. trichocarpa | black cottonwood | Salicaceae |
| Populus fremontii | Fremont cottonwood, alamo cottonwood | Salicaceae |
| *Populus trichocarpa | black cottonwood | Salicaceae |
| Potamogeton illinoensis | shining pondweed | Potamogetonaceae |
| Potamogeton natans | floating-leaf pondweed | Potamogetonaceae |
| Potamogeton pectinatus | fennel-leaf pondweed | Potamogetonaceae |
| Potentilla glandulosa | sticky cinquefoil | Rosaceae |
| *Prunus amygdalus | almond | Rosaceae:
| Prunus armeniaca | apricot | Rosaceae |
| Prunus dulcis | almond | Rosaceae |
| Prunus ilicifolia | hollyleaf cherry, islay | Rosaceae |
| Prunus virginiana var. demissa | western chokecherry | Rosaceae |
| Psilocarphus brevissimus var. multiflorus | delta woolly marbles | Asteraceae |
| *Psoralea macrostachya | leather root, California hemp | Fabaceae |
| *Psoralea orbicularis | round-leaf psoralea, round-leaf hoita | Fabaceae |
| *Psoralea physodes | California-tea | Fabaceae |
| *Ptelea baldwinii var. crenulata | western hoptree, hoptree | Rutaceae |
| Ptelea crenulata | western hoptree, hoptree | Rutaceae |
| Pteridium aquilinum var. pubescens | western bracken | Dennstaedtiaceae |
| Pterostegia drymarioides | botanist's friend | Polygonaceae |
| Pyracantha augustifolia | firethorn | Rosaceae |
| *Pyrus malus | apple | Rosaceae |
| Quercus agrifolia | coast live oak, California live oak, encina | Fagaceae |
| Quercus berberidifolia | scrub oak, California scrub oak | Fagaceae |
| Quercus chrysolepsis | canyon live oak, maul oak, goldcup oak | Fagaceae |
| Quercus douglasii | blue oak | Fagaceae |
| *Quercus dumosa | scrub oak, California scrub oak | Fagaceae |
| Quercus durata | leather oak | Fagaceae |
| Quercus kelloggii | California black oak | Fagaceae |
| Quercus lobata | valley oak, California white oak, roble | Fagaceae |
| Quercus wislizeni | interior live oak, sierra live oak | Fagaceae
| Quercus X morehus | oracle oak | Fagaceae |
| Rafinesquia californica | California chicory | Asteraceae |
| Ranunculus aquatilis var. capillaceus | water buttercup | Ranunculaceae |
| Ranunculus californicus | California buttercup | Ranunculaceae |
| Ranunculus hebecarpus | downy buttercup | Ranunculaceae |
| Ranunculus muricatus | prickleseed buttercup | Ranunculaceae |
| Raphanus sativus | radish, wild radish | Brassicaceae |
| *Rhamnus californica var. tomentella | hoary coffeeberry, chaparral coffeeberry, coffeeberry | Rhamnaceae |
| Rhamnus crocea | spiny redberry, redberried buckthorn | Rhamnaceae |
| *Rhamnus crocea ssp. ilicifolia | hollyleaf redberry | Rhamnaceae |
| Rhamnus ilicifolia | hollyleaf redberry | Rhamnaceae |
| Rhamnus tomentella | hoary coffeeberry, chaparral coffeeberry, coffeeberry | Rhamnaceae |
| *Rhus diversiloba | western poison oak | Anacardiaceae |
| Ribes californicum | hillside gooseberry, California gooseberry | Grossulariaceae |
| Ribes malvaceum | chaparral current | Grossulariaceae |
| Ribes menziesii | canyon gooseberry | Grossulariaceae |
| *Ribes menziesii var. leptosmum | canyon gooseberry | Grossulariaceae |
| Ribes quercetorum | rock gooseberry, oak gooseberry | Grossulariaceae |
| Ribes speciosum | fuchsia-flowered gooseberry | Grossulariaceae |
| Rigiopappus leptocladus | rigiopappus | Asteraceae |
| Robinia pseudoacacia | black locust, false acacia | Fabaceae |
| Rorippa curvisiliqua | western yellowcress, yellowcress | Brassicaceae |
| Rorippa nasturtium-aquaticum | watercress | Brassicaceae |
| Rosa californica | California rose | Rosaceae |
| Rosa gymnocarpa | wood rose | Rosaceae |
| Rosa spithamea | ground rose | Rosaceae |
| *Rosa spithamea var. sonomensis | ground rose | Rosaceae |
| Rubus discolor | Himalayan blackberry | Rosaceae |
| *Rubus procerus | Himalayan blackberry | Rosaceae |
| Rubus ursinus | California blackberry, Pacific blackberry | Rosaceae |
| *Rubus vitifolius | California blackberry, Pacific blackberry | Rosaceae |
| Rumex acetosella | sheep sorrel | Polygonaceae |
| Rumex conglomeratus | whorled dock, green dock, clustered dock | Polygonaceae |
| Rumex crispus | curly dock, yellow dock | Polygonaceae |
| Rumex obtusifolius | bitter dock | Polygonaceae |
| Rumex salicifolius | willow dock | Polygonaceae |
| Rupertia physodes | California-tea | Fabaceae |
| *Sagittaria calycina | calycinate arrowhead | Alismataceae |
| Sagittaria montevidensis ssp. calycina | calycinate arrowhead | Alismataceae |
| Salix babylonica | weeping willow | Salicaceae |
| Salix exigua | narrowleaf willow, sandbar willow | Salicaceae |
| *Salix hindsiana | narrowleaf willow, sandbar willow | Salicaceae |
| Salix laevigata | red willow, smooth willow | Salicaceae |
| *Salsola pestifer | Russian thistle, tumbleweed | Chenopodiaceae |
| *Salsola kali var. tenuifolia | Russian thistle, tumbleweed | Chenopodiaceae |
| Salsola tragus | Russian thistle, tumbleweed | Chenopodiaceae |
| Salvia columbariae | chia | Lamiaceae |
| Sambucus mexicana | blue elderberry, Mexican elder, elder blueberry | Caprifoliaceae |
| Sanicula bipinnata | poison sanicle | Apiaceae |
| Sanicula bipinnatifida | purple sanicle | Apiaceae |
| Sanicula crassicaulis | gambleweed, Pacific snakeroot | Apiaceae |
| Sanicula saxatilis | rock sanicle, Diablo sanicle | Apiaceae |
| Sanicula tuberosa | turkey pea, tuberous sanicle | Apiaceae |
| Satureja douglasii | yerba buena | Lamiaceae |
| Saxifraga californica | California saxifrage | Saxifragaceae |
| Scandix pecten-veneris | shepherd's needle, Venus' needle, Venus' comb | Apiaceae |
| Scirpus acutus var. occidentalis | hardstem bulrush | Cyperaceae |
| Scrophularia californica ssp. floribunda | California figwort, beeplant, California beeplant | Scrophulariaceae |
| Scutellaria bolanderi ssp. bolanderi | skullcap | Lamiaceae |
| Scutellaria siphocampyloides | grayleaf skullcap | Lamiaceae |
| Scutellaria tuberosa | Danny's skullcap, blue skullcap | Lamiaceae |
| Sedum radiatum | star-fruited stonecrop, narrow-petal stonecrop | Crassulaceae |
| Sedum spathulifolium | Pacific stonecrop, broadleaf stonecrop | Crassulaceae |
| *Sedum stenopetalum ssp. radiatum | star-fruited stonecrop, narrow-petal stonecrop | Crassulaceae |
| Selaginella bigelovii | Bigelow moss-fern, bushy selaginella | Selaginellaceae |
| Senecio aronicoides | California butterweed | Asteraceae |
| Senecio breweri | Brewer's butterweed | Asteraceae |
| *Senecio douglasii | creek senecio, shrubby butterweed, bush groundsel | Asteraceae |
| Senecio flaccidus var. douglasii | creek senecio, shrubby butterweed, bush groundsel | Asteraceae |
| Senecio vulgaris | common groundsel, old-man-in-the-spring | Asteraceae |
| Sherardia arvensis | field madder, blue field madder | Rubiaceae |
| *Sida hederacea | alkali mallow, whiteweed | Malvaceae |
| *Sida leprosa var. hederacea | alkali mallow, whiteweed | Malvaceae |
| Sidalcea diploscypha | fringed sidalcea, fringed checkerbloom | Malvaceae |
| Sidalcea malvaeflora | common checkerbloom, wild hollyhock | Malvaceae |
| Silene gallica | windmill pink, common catchfly | Caryophyllaceae
| Silybum marianum | milk thistle, holy thistle | Asteraceae |
| *Sinapis incana | Mediterranean mustard, summer mustard, shortpod mustard | Brassicaceae |
| Sisymbrium irio | London rocket | Brassicaceae |
| Sisymbrium officinale | hedge mustard | Brassicaceae |
| Sisyrinchium bellum | blue-eyed grass, California blue-eyed grass | Iridaceae |
| *Sitanion jubatum | big squirreltail | Poaceae |
| Smilacina racemosa | fat Solomon, fat Solomon's seal, branched Solomon's seal | Liliaceae |
| *Smilacina racemosa var. amplexicaulis | fat Solomon, fat Solomon's seal, branched Solomon's seal | Liliaceae |
| Smilacina stellata | slim Solomon, slim Solomon's seal | Liliaceae |
| *Smilacina stellata var. sessilifolia | slim Solomon, slim Solomon's seal | Liliaceae |
| Solanum americanum | small-flowered nightshade | Solanaceae |
| Solanum nigrum | black nightshade | Solanaceae |
| *Solanum nodiflorum | small-flowered nightshade | Solanaceae |
| Solanum umbelliferum | blue witch, blue nightshade | Solanaceae |
| Solidago californica | California goldenrod | Asteraceae |
| *Solidago occidentalis | western goldenrod | Asteraceae |
| Sonchus asper | prickly sow thistle | Asteraceae |
| Sonchus oleraceus | common sow thistle | Asteraceae |
| Spergula arvensis | corn spurry, stickwort, starwort | Caryophyllaceae |
| Spergularia rubra | purple sand spurry | Caryophyllaceae |
| Spiranthes porrifolia | western ladies' tresses | Orchidaceae |
| *Spiranthes romanzoffiana var. porrifolia | western ladies' tresses | Orchidaceae |
| Stachys ajugoides var. rigida | rigid hedgenettle, rigid betony | Lamiaceae |
| Stachys pycnantha | short-spiked hedgenettle | Lamiaceae |
| *Stachys rigida ssp. quercetorum | rigid hedgenettle, rigid betony | Lamiaceae |
| Stebbinsoseris heterocarpa | derived microseris | Asteraceae |
| Stellaria media | common chickweed | Caryophyllaceae |
| Stellaria nitens | shining chickweed | Caryophyllaceae |
| Stephanomeria virgata | tall stephanomeria, twiggy wreath plant | Asteraceae |
| *Stipa cernua | nodding needle grass | Poaceae |
| *Stipa lepida | foothill needle grass | Poaceae |
| *Stipa pulchra | purple needle grass | Poaceae |
| Streptanthus callistus | Mount Hamilton jewelflower, royal jewelflower | Brassicaceae |
| Streptanthus glandulosus ssp. glandulosus | common jewel flower, bristly jewel flower | Brassicaceae |
| *Stylocline filaginea | woolly fishhooks, northern stylocline | Asteraceae |
| Stylomecon heterophylla | wind poppy | Papaveraceae |
| Symphoricarpos albus var. laevigatus | common snowberry | Caprifoliaceae |
| Symphoricarpos mollis | creeping snowberry, trip vine, spreading snowberry | Caprifoliaceae |
| *Symphoricarpos rivularis | common snowberry | Caprifoliaceae |
| Taraxacum officinale | common dandelion | Asteraceae |
| Tauschia hartwegii | Hartweg's tauschia | Apiaceae |
| Thalictrum fendleri var. polycarpum | Fendler's meadow-rue, many-fruited meadow-rue | Ranunculaceae |
| *Thalictrum polycarpum | Fendler's meadow-rue, many-fruited meadow-rue | Ranunculaceae |
| *Thelypodium lasiophylla | California mustard | Brassicaceae |
| Thermopsis macrophylla | California false lupine | Fabaceae |
| Thysanocarpus curvipes | lace pod, fringe pod, hairy fringepod | Brassicaceae |
| *Thysanocarpus curvipes var. elegans | lace pod, fringe pod, hairy fringepod | Brassicaceae |
| Thysanocarpus laciniatus | narrow-leaf fringe pod, crenate fringe pod | Brassicaceae |
| *Thysanocarpus laciniatus var. crenatus | narrow-leaf fringe pod, crenate fringe pod | Brassicaceae |
| *Tillaea aquatica | water pygmyweed, pygmyweed | Crassulaceae |
| *Tillaea erecta | pygmyweed, sand pygmyweed | Crassulaceae |
| Tonella tenella | small-flowered tonella, baby innocence | Scrophulariaceae |
| Torilis arvensis | spreading hedge-parsley | Apiaceae |
| Torilis nodosa | knotted hedge-parsley | Apiaceae |
| Torreya californica | California nutmeg, California torreya | Taxaceae |
| Toxicodendron diversilobum | western poison oak | Anacardiaceae |
| Trachycarpus excelsa | windmill palm, fortune palm | Arecaceae |
| Tragopogon dubius | yellow salsify | Asteraceae |
| Tragopogon porrifolius | salsify, oyster plant | Asteraceae |
| Trichostema lanceolatum | vinegar weed, blue curls | Lamiaceae |
| Trientalis latifolia | Pacific starflower, western starflower | Primulaceae |
| Trifolium albopurpureum var. albopurpureum | Indian clover, rancheria clover | Fabaceae |
| Trifolium albopurpureum var. dichotomum | branched Indian clover | Fabaceae |
| Trifolium albopurpureum var. olivaceum | olive clover, rancheria clover | Fabaceae |
| *Trifolium amplectans var. truncatum | dwarf sack clover, common palesack clover | Fabaceae |
| Trifolium bifidum | pinole clover, notch-leaf clover | Fabaceae |
| Trifolium ciliolatum | tree clover | Fabaceae |
| Trifolium depauperatum var. depauperatum | dwarf sack clover | Fabaceae |
| Trifolium depauperatum var. truncatum | dwarf sack clover, common palesack clover | Fabaceae |
| *Trifolium dichotomum | branched Indian clover | Fabaceae |
| Trifolium gracilentum | pinpoint clover | Fabaceae |
| Trifolium hirtum | rose clover | Fabaceae |
| Trifolium microcephalum | small-headed clover, maiden clover, smallhead clover | Fabaceae |
| Trifolium microdon | valparaiso clover, cup clover | Fabaceae |
| Trifolium obtusiflorum | creek clover, clammy clover | Fabaceae |
| Trifolium oliganthum | few-flowered clover | Fabaceae |
| *Trifolium olivaceum | olive clover, rancheria clover | Fabaceae |
| Trifolium repens | white clover, white lawn clover | Fabaceae |
| *Trifolium tridentatum | tomcat clover, common palesack clover | Fabaceae |
| Trifolium variegatum | white-tipped clover, whitetip clover | Fabaceae |
| Trifolium willdenovii | tomcat clover, common palesack clover | Fabaceae |
| Trillium chloropetalum | giant trillium | Liliaceae |
| *Trillium chloropetalum var. giganteum | giant trillium | Liliaceae |
| Triphysaria eriantha | butter-and-eggs, Johnny-tuck, yellow Johnny-tuck | Scrophulariaceae |
| Triphysaria pusilla | dwarf owl's clover | Scrophulariaceae |
| Trisetum canescens | tall trisetum | Poaceae |
| *Trisetum cernuum ssp. canescens | tall trisetum | Poaceae |
| Triteleia hyacinthina | white brodiaea, white triteleia, white hyacinth | Liliaceae |
| Triteleia laxa | Ithuriel's spear, wally basket, grass nuts | Liliaceae |
| Tropidocarpum gracile | dobiepod, slender tropidocarpum | Brassicaceae |
| Typha domingensis | southern cattail | Typhaceae |
| Typha latifolia | broad-leaf cattail | Typhaceae |
| Ulmus parvifolia | Chinese elm | Ulmaceae |
| Umbellularia californica | California bay laurel, Oregon myrtle | Lauraceae |
| Uropappus lindleyi | silver puffs | Asteraceae |
| Urtica dioica ssp. holosericea | hoary nettle | Urticaceae |
| *Urtica holosericea | hoary nettle | Urticaceae |
| Urtica urens | dwarf nettle, small nettle | Urticaceae |
| Velezia rigida | velezia | Caryophyllaceae |
| Verbascum thapsus | wooly mullein, common mullein | Scrophulariaceae |
| Verbena lasiostachys var. lasiostachys | western verbena, California vervain | Verbenaceae |
| Verbena lasiostachys var. scabrida | robust verbena, robust vervain | Verbenaceae |
| *Verbena robusta | robust verbena, robust vervain | Verbenaceae |
| Veronica anagallis-aquatica | water speedwell | Scrophulariaceae |
| Veronica arvensis | common speedwell, corn speedwell | Scrophulariaceae |
| Veronica persica | Persian speedwell | Scrophulariaceae |
| *Vicia dasycarpa | hairy vetch, winter vetch | Fabaceae |
| Vicia sativa | spring vetch, common vetch, tare | Fabaceae |
| Vicia villosa ssp. varia | hairy vetch, winter vetch | Fabaceae |
| Vinca major | greater periwinkle | Apocynaceae |
| Viola douglasii | Douglas' violet, golden violet | Violaceae |
| Viola ocellata | western heart's ease, two-eyed violet | Violaceae |
| Viola pedunculata | Johnny-jump-up, California golden violet, yellow pansy | Violaceae |
| Viola purpurea ssp. quercetorum | oak violet, mountain violet | Violaceae |
| *Viola quercetorum | oak violet, mountain violet | Violaceae |
| Vulpia bromoides | brome fescue | Poaceae |
| Vulpia microstachys var. ciliata | hairy fescue | Poaceae |
| Vulpia microstachys var. pauciflora | common hairleaf fescue | Poaceae |
| Vulpia myuros var. hirsuta | foxtail fescue | Poaceae |
| Vulpia myuros var. myuros | rattail fescue | Poaceae |
| Woodwardia fimbriata | giant chain fern | Blechnaceae |
| Wyethia helenioides | gray mule ears | Asteraceae |
| Xanthium spinosum | spiny clotbur, Spanish thistle | Asteraceae |
| Xanthium strumarium | cocklebur | Asteraceae |
| Yabea microcarpa | California hedge-parsley | Apiaceae |
| *Zauschneria californica | California fuchsia | Onagraceae |
| Zigadenus fremontii | common star lily, Fremont's camas | Liliaceae
| Zigadenus venenosus | death camas | Liliaceae |
| | | | | | | | |
|
|