| Checklist of Vascular Plant Species Occurring Within the BCCER | |
| This checklist is under continual revision. Please send corrections or additions to: pmaslin@csuchico.edu | |
| A "+" indicates non-native species | |
| SCIENTIFIC NAME | COMMON NAME |
| Abies concolor | White fir |
| Acer macrophyllum | Big-leaved maple |
| Achnatherum lemmonii | Lemmon's needlegrass |
| Achyrachaena mollis | Blow wives |
| Adiantum capillus-veneris | Southern maidenhair |
| Adiantum jordanii | California maidenhair |
| Aegilops triuncialis + | Barbed goatgrass |
| Aesculus californica | California buckeye |
| Agoseris heterophylla | Annual agoseris |
| Agoseris retrorsa | Spear-leafed agoseris |
| Agrostis exarata | Spiked bentgrass |
| Aira caryophyllea + | Silver European hairgrass |
| Alisma plantago-aquatica | Water-plantain |
| Allium amplectens | Clasping onion |
| Allium cratericola | Volcanic onion |
| Allium membranaceum | Papery onion |
| Allium peninsulare var. peninsulare | Mexican onion |
| Allium sanbornii var sanbornii | Sanborn's onion |
| Alnus rhombifolia | White alder |
| Alopecurus pratensis + | Meadow foxtail |
| Amsinkia menziesii var. intermedia | Common fiddleneck |
| Amsinkia menziesii var. menziesii | Menzie's fiddleneck |
| Anagallis arvensis + | Scarlet pimpernell |
| Andropogon glomeratus var. scabriglumis | Southwestern bushy bluestem |
| Angelica californica | California angelica |
| Anthemis cotula + | Mayweed |
| Anthriscus caucalis + | Bur-chervil |
| Antirrhinum cornutum | Spurred snapdragon |
| Antirrhinum vexillo-calyculatum ssp intermedium | Wiry Snapdragon |
| Aphanes occidentalis | Western lady's mantle |
| Apocynum cannabinum | Indian-hemp |
| Aquilegia formosa var. truncata | Crimson columbine |
| Arabis breweri var. austiniae | Austin's rockcress |
| Arabis glabra var. glabra | Tower-mustard |
| Arbutus menziesii | Pacific madrone |
| Arceuthobium occidentale | Gray pine dwarf-mistletoe |
| Arctostaphylos manzanita | Big manzanita |
| Arctostaphylos viscida | White-leaved manzanita |
| Aristolochia californica | California pipevine |
| Arrhenatherum elatius + | Tall oatgrass |
| Artemisia douglasiana | Douglas' mugwort |
| Asarum hartwegii | Hartweg's wild ginger |
| Asclepias cordifolia | Purple milkweed |
| Asclepias eriocarpa | Indian milkweed |
| Asclepias fascicularis | Narrow-leaved milkweed |
| Asclepias speciosa | Showy milkweed |
| Asparagus officinalis + | Garden asparagus |
| Aspidotis californica | California lace fern |
| Aster chilensis | California aster |
| Aster radulinus | Broad-leaved aster |
| Astragalus gambelianus | Gambel's milk-vetch |
| Astragalus pauperculus | Depauperate milk-vetch |
| Athysanus pusillus | Petty athysanus |
| Avena barbata + | Slender wild oats |
| Avena fatua + | Wild oats |
| Baccharis pilularis | Coyote-brush |
| Baccharis salicifolia | Mule's-fat |
| Balsamorhiza deltoidea | Deltoid balsamroot |
| Blennosperma nanum var. nanum | Yellow-carpet |
| Brachypodium distachyon + | False brome |
| Brassica nigra + | Black mustard |
| Brickellia californica | California brickellbush |
| Briza maxima + | Greater quaking-grass |
| Briza minor + | Small quaking-grass |
| Brodiaea californica | Claifornia brodiaea |
| Brodiaea elegans | Elegant brodiaea |
| Brodiaea minor | Blue stars |
| Brodiaea purdyi | Purdy's brodiaea |
| Bromus carinatus ssp. carinatus | California brome |
| Bromus diandrus + | Ripgut brome |
| Bromus hordeaceus + | Soft chess |
| Bromus laevipes | Woodland brome |
| Bromus madritensis ssp. rubens + | Red brome |
| Bromus madritensis var. madritensis + | Foxtail brome |
| Bromus sterilis + | Poverty brome |
| Calandrinia ciliata | Redmaids |
| Callitriche heterophylla var. bolanderi | Variable-leaved water-starwort |
| Callitriche marginata | Winged water-starwort |
| Calocedrus decurrens | Incense cedar |
| Calochortus luteus | Yellow mariposa lily |
| Calochortus monophyllus | Yellow star-tulip |
| Calochortus superbus | Superb mariposa lily |
| Calycadenia fremontii | Fremont's calycadenia |
| Calycadenia oppositifolia (CNPS LIST 1B) | Butte calycadenia |
| Calycadenia truncata | Rosinweed |
| Calycanthus occidentalis | Western Spicebush |
| Calystegia occidentalis ssp. occidentalis | Western morning-glory |
| Capsella bursa-pastoris + | Shepherd's purse |
| Cardamine californica var. californica | Milkmaids |
| Cardamine oligosperma | Western bitter cress |
| Carduus pycnocephalus + | Italian plumeless thistle |
| Carex amplifolia | Ample-leaved sedge |
| Carex barbarae | Santa Barbara sedge |
| Carex densa | Dense sedge |
| Carex deweyana ssp. leptopoda | Short-scaled sedge |
| Carex multicaulis | Many-stemmed sedge |
| Carex nudata | Torrent sedge |
| Castilleja affinis ssp. affinis | Lay-and-Collie's indian-paintbrush |
| Castilleja applegatei ssp. pinetorum | Wavy-leaved indian-paintbrush |
| Castilleja attenuata | Valley tassels |
| Castilleja exserta | Purple owl-clover |
| Castilleja lacera | Cut-leaved owl-clover |
| Ceanothus cuneatus | Buckbrush |
| Ceanothus integerrimus | Deerbrush |
| Centaurea melitensis + | Tocalote |
| Centaurea solstitialis + | Yellow star-thistle |
| Centaurium muehlenbergii | June centaury |
| Centaurium venustum | Canchalagua |
| Cephalanthera austiniae | Phantom orchid |
| Cephalanthus occidentalis | California buttonbush |
| Cerastium glomeratum + | Sticky mouse-eared chickweed |
| Cercis occidentalis | Western redbud |
| Cercocarpus betuloides | Birch-leaved mountain-mahogany |
| Chamaesyce ocellata ssp. ocellata | Valley spurge |
| Chamomilla suaveolens + | Common pineapple weed |
| Chlorogalum angustifolium | Narrow-leaved soaproot |
| Chlorogalum pomeridianum | Wavy-leaved soaproot |
| Chorizanthe polyganoides var. polyganoides | Knotweed spineflower |
| Chorizanthe stellulata | Starlet spineflower |
| Cichorium intybus + | Chichory |
| Cirsium occidentale var. venustum | Venus thistle |
| Cirsium vulgare + | Bull thistle |
| Clarkia gracilis ssp. albicaulis (CNPS 1B) | White-stemmed clarkia |
| Clarkia purpurea ssp. quadrivulnera | Purple clarkia |
| Clarkia rhomboidea | Diamond clarkia |
| Claytonia parviflora ssp parvilflora | Small-flowered miner's lettuce |
| Claytonia perfoliata | Miner's lettuce |
| Clematis lasiantha | Chaparral clematis |
| Clematis ligusticifolia | Western virgin's bower |
| Collinsia heterophylla | Chinese houses |
| Collinsia sparsiflora var. bruceae | Foothill collinsia |
| Collinsia sparsiflora var. sparsiflora | Few-flowered collinsia |
| Collinsia tinctoria | Sticky Chinese-houses |
| Collomia heterophylla | Variable-leaved collomia |
| Comandra umbellata | Bastard toadflax |
| Convolvulus arvensis + | Bindweed |
| Conyza canadensis | Canadian horseweed |
| Cordylanthus pilosus ssp. hansenii | Hansen's bird's-beak |
| Cornus glabrata | Brown dogwood |
| Cornus nuttallii | Mountain dogwood |
| Cornus sessilis | Black-fruited dogwood |
| Crassula aquatica | Water pygmyweed |
| Crassula connata | Pygmyweed |
| Crassula tillaea + | Mossy pygmyweed |
| Crataegus laevigata + | Smooth hawthorn |
| Crypsis schoenoides + | Swamp pricklegrass |
| Cryptantha flaccida | Weak-stemmed cryptantha |
| Crucianella angustifolia + | Crosswort |
| Cuscuta californica var. breviflora | Short-flowered dodder |
| Cynoglossum grande | Pacific hound's-tongue |
| Cynosurus echinatus + | Hedgehog dogtail |
| Cynodon dactylon + | Bermuda-grass |
| Cyperus eragrostis | Tall cyperus |
| Cyperus niger | Black cyperus |
| Cyperus strigosus | False nutsedge |
| Cystopteris fragilis | Brittle fern |
| Dactylis glomerata + | Orchard grass |
| Damasonium californicum | Fringed water-plantain |
| Darmera peltata | Indian-rhubarb |
| Datura wrightii | Thorn-apple |
| Daucus pusillus | Rattlesnake-weed |
| Delphinium hansenii ssp. hansenii | Hansen's larkspur |
| Delphinium nudicaule | Red larkspur |
| Delphinium patens ssp. patens | Spreading larkspur |
| Delphinium variegatum | Royal larkspur |
| Deschampsia danthonioides | Annual hairgrass |
| Deschampsia elongata | Slender hairgrass |
| Dichelostemma capitatum | Blue dicks |
| Dichelostemma congestum | Fork-toothed ookow |
| Dichelostemma multiflorum | Round-toothed ookow |
| Dichelostemma volubile | Twining ookow |
| Distichlis spicata | Saltgrass |
| Dodecatheon clevelandii ssp. patulum | Lowland shootingstar |
| Dodecatheon hendersonii | Henderson's shootingstar |
| Downingia ornatissima var. ornatissima | Folded downingia |
| Draba verna var. aestivalis + | Spring whitlow-grass |
| Dryopteris arguta | Coastal wood fern |
| Dudleya cymosa | Canyon dudleya |
| Eleocharis macrostachya | Pale spike-rush |
| Eleocharis parishii | Parish's spike-rush |
| Elymus glaucus | Blue wild-rye |
| Elymus multisetus | Big squirreltail |
| Epilobium canum ssp. latifolium | California fuchsia |
| Epilobium ciliatum ssp. ciliatum | Fringed-willowherb |
| Epilobium densiflorum | Dense-flowered spike-primrose |
| Epilobium minutum | Chaparral willowherb |
| Epilobium torreyi | Torrey's spike-primrose |
| Epipactis gigantea | Stream orchid |
| Equisetum hyemale ssp. affine | Common scouring-rush |
| Equisetum laevigatum | Smooth scouring-rush |
| Eremocarpus setigerus | Doveweed |
| Erigeron divergens | Spreading daisy |
| Erigeron inornatus var. inornatus | California rayless daisy |
| Erigeron philadelphicus | Philadelphia daisy |
| Eriodictyon californicum | Yerba-santa |
| Eriogonum nudum var. pubiflorum | Hairy-flowered buckwheat |
| Eriophyllum lanatum ssp. grandiflorum | Woolly sunflower |
| Erodium botrys + | Long-beaked stork's-bill |
| Erodium brachycarpum + | Short-beaked stork's-bill |
| Erodium cicutarium + | Red-stemmed filaree |
| Erysimum capitatum | Western wallflower |
| Erythronium multiscapideum | Fawn lily |
| Eschscholzia caespitosa | Foothill poppy |
| Eschscholzia californica | California poppy |
| Eschscholzia lobbii | Frying pan poppy |
| Euphorbia crenulata | Chinese caps |
| Euphorbia spathulata | Warty spurge |
| Festuca arundinacea + | Reed fescue |
| Festuca occidentalis | Western Fescue |
| Ficus carica + | Edible fig |
| Filago californica | California filago |
| Filago gallica + | Narrow-leaved filago |
| Fraxinus dipetala | California ash |
| Fraxinus latifolia | Oregon ash |
| Fritillaria affinis var. affinis | Checkered fritillary |
| Fritillaria recurva | Scarlet fritillary |
| Galium aparine + | Cleavers |
| Galium bolanderi | Bolsander's bedstraw |
| Galium divaricatum | Lamarck's Bedstraw |
| Galium parisiense + | Wall bedstraw |
| Galium porrigens var. tenue | Narrow-leaved climbing bedstraw |
| Garrya fremontii | Fremont silktassel |
| Gastridium ventricosum + | Nitgrass |
| Geranium carolinianum | Carolina geranium |
| Geranium dissectum + | Cut-leaved geranium |
| Geranium molle + | Dove's-foot geranium |
| Gilia capitata | Globe gilia |
| Gilia tricolor | Bird's-eye gilia |
| Githopsis diffusa ssp. robusta | Robust bluecup |
| Githopsis pulchella ssp. campestris | Large-flowered bluecup |
| Githopsis specularioides | Common bluecup |
| Glycyrrhiza lepidota | American licorice |
| Gnaphalium californicum | California cudweed |
| Gnaphalium canescens | Fragrant cudweed |
| Gnaphalium luteo-album + | Weedy cudweed |
| Grindelia hirsutula var. davyi | Foothill gumplant |
| Hedypnois cretica + | Hedypnois |
| Helianthella californica var nevadensis | Sierra Nevada Helianthella |
| Heliotropium europaeum + | European heliotroph |
| Hemizonia fitchii | Fitch's tarweed |
| Hesperevax acaulis var. acaulis | Dwarf evax |
| Hesperevax acaulis var. ambusticola | Fire-dwelling evax |
| Hesperocnide tenella | Western nettle |
| Heteromeles arbutifolia | Toyon |
| Heuchera micrantha var. erubescens | Crevice alumroot |
| Hieracium albiflorum | White-flowered hawkweed |
| Hoita macrostachya | Large leather-root |
| Holcus lanatus + | Common velvetgrass |
| Hordeum marinum ssp. gussoneanum + | Mediterranean barley |
| Hordeum murinum ssp. leporinum + | Hare wall barley |
| Hydrophyllum occidentale | California waterleaf |
| Hypericum anagalloides | Tinker's penny |
| Hypericum mutilum + | Small-flowered St. John's-wort |
| Hypericum perforatum + | Klamath weed |
| Hypochaeris glabra + | Smooth cat's-ear |
| Iris macrosiphon | Long-tubed iris |
| Isoetes nuttallii | Nuttall's quillwort |
| Isopyrum occidentale | Western rue-anemone |
| Juglans californica var. hindsii | California black walnut |
| Juncus bufonius var. bufonius | Common toadrush |
| Juncus effusus var. exiguus | Short rush |
| Juncus ensifolius | Sword-leaved rush |
| Juncus oxymeris | Pointed rush |
| Juncus patens | Spreading rush |
| Juncus tenuis | Slender rush |
| Keckiella breviflora var. glabrisepala | Gaping keckiella |
| Keckiella corymbosa | Redwood keckiella |
| Keckiella lemmonii | Lemmon's keckiella |
| Koeleria phleoides + | Bristly koeler's-grass |
| Lactuca serriola + | Prickly lettuce |
| Lagophylla glandulosa | Glandular hareleaf |
| Lamium amplexicaule + | Giraffehead |
| Lasthenia californica | California goldfields |
| Lathyrus sulphureus | Snub pea |
| Lathyrus tingitanus + | Tangier pea |
| Layia fremontii | Tidy-tips |
| Lemna minuta | Least duckweed |
| Lepechinia calycina | California pitcher-sage |
| Lepidium nitidum | Shining pepper-grass |
| Lepidium strictum | Upright pepper-grass |
| Lessingia nemaclada | Slender-stemmed lessingia |
| Leymus triticoides | Alkali ryegrass |
| Lilium humboldtii | Humboldt lily |
| Lilium pardalinum ssp. shastense | Shasta lily |
| Limnanthes douglasii ssp. nivea | Table Mountain Meadowfoam |
| Linanthus bicolor | Bicolored linanthus |
| Linanthus bolanderi | Bolander’s linanthus |
| Linanthus ciliatus | Whiskerbrush |
| Linanthus dichotomus | Evening-snow |
| Linanthus filipes | Wild baby's breath |
| Lithophragma bolanderi | Bolander's woodlandstar |
| Lithophragma campanulatum | Bell-shaped woodlandstar |
| Lithophragma parviflorum var. trifoliatum | Three-parted woodlandstar |
| Lithospermum californicum | California gromwell |
| Lolium multiflorum + | Italian ryegrass |
| Lolium temulentum + | Darnel |
| Lomatium dasycarpum ssp. tomentosum | Wooly-fruited lomatium |
| Lomatium dissectum var multifidum | Fern-leaved lomatium |
| Lomatium macrocarpum | Large-fruited lomatium |
| Lomatium utriculatum | Bladder lomatium |
| Lonicera interrupta | Chaparral honeysuckle |
| Lotus corniculatus + | Bird's-foot-trefoil |
| Lotus humistratus | Foothill lotus |
| Lotus micranthus | Small-flowered lotus |
| Lotus oblongifolius var. oblongifolius | Streambank lotus |
| Lotus purshianus var. purshianus | Spanish lotus |
| Lotus wrangelianus | Wrangel lotus |
| Lupinus albicaulis | Sickle-keeled lupine |
| Lupinus albifrons var. albifrons | Silver bush lupine |
| Lupinus arbustus | Spurred lupine |
| Lupinus bicolor | Bicolored lupine |
| Lupinus latifolius var. columbianus | Broad-leaved lupine |
| Lupinus microcarpus var. densiflorus | White-whorled lupine |
| Lupinus nanus | Sky lupine |
| Lupinus pachylobus | Big-podded lupine |
| Luzula comosa var subsessilis | Sessile woodrush |
| Lychnis coronaria + | Mullein-pink |
| Lythrum hyssopifolia + | Hyssop loosestrife |
| Madia elegans ssp densifolia. | Dense-leaved madia |
| Madia elegans ssp. vernalis | Spring madia |
| Madia exigua | Thread-Stemmed Madia |
| Madia gracilis | Slender tarweed |
| Madia subspicata | Spiked tarweed |
| Malus sylvestris + | Apple |
| Marah fabaceus | California manroot |
| Marah watsonii | Taw manroot |
| Marrubium vulgare + | Horehound |
| Matricaria matricarioides + | Pineapple weed |
| Meconella californica | California meconella |
| Medicago arabica+ | Spotted medick |
| Medicago polymorpha + | Common bur clover |
| Melica californica. | California melic |
| Melica harfordii | Harford's melic |
| Melica torreyana | Torrey's melic |
| Melilotus albus + | White sweet clover |
| Melissa officinalis + | Bee-balm |
| Mentha arvensis | American wild mint |
| Micropus californicus var californicus | Slender cottonweed |
| Microseris acuminata | Sierra foothill microseris |
| Mimulus aurantiacus | Bush monkey-flower |
| Mimulus bicolor | Yellow-and-white monkey-flower |
| Mimulus cardinalis | Scarlet monkey-flower |
| Mimulus douglasi | Douglas’ monkey-flower |
| Mimulus glaucescens (CNPS List 4) | Shield-bracted monkey-flower |
| Mimulus guttatus | Seep monkey-flower |
| Mimulus kelloggii | Kellogg's monkey flower |
| Mimulus layneae | Layne's monkey flower |
| Mimulus moschatus | Musk monkey flower |
| Minuartia californica | California sandwort |
| Minuartia douglasii | Douglas’ sandwort |
| Monardella sheltonii | Shelton's coyote mint |
| Montia fontana ssp. amporitana | Water montia |
| Montia fontana ssp. chondrosperma | Water montia |
| Muhlenbergia filiformis | Pullup muhly |
| Muhlenbergia mexicana | Mexican muhly |
| Muhlenbergia rigens | Deergrass |
| Myosotis discolor + | Yellow scorpion-grass |
| Narcissus pseudonarcissus + | Common daffodil |
| Nassella pulchra | Purple needlegrass |
| Navarretia divaricata ssp. vividior | Spreading navarretia |
| Navarretia filicaulis | Thread-stenned navarretia |
| Navarretia intertexta ssp. intertexta | Needle-leaved navarretia |
| Navarretia leucocephala | White-flowered navarretia |
| Navarretia pubescens | Downy navarretia |
| Navarretia subuligera (CNPS List 4) | Awl-leaved navarretia |
| Navarretia tagetina | Marigold navarretia |
| Nemophila heterophylla | Variable-leaved nemophylla |
| Nemophila menziesii | Baby-blue-eyes |
| Nemophila pedunculata | Meadow nemophila |
| Odontostomum hartwegii | Hartweg's odontostomum |
| Oemleria cerasiformis | Oso-berry |
| Olea europaea + | Olive |
| Orobanche fasciculata | Clustered broom-rape |
| Orobanche uniflora | Naked broom-rape |
| Osmorhiza chilensis | Mountain Sweet-cicely |
| Panicum acuminatum var. acuminatum | Western panicgrass |
| Parvisedum pumilum | Dwarf-stonecrop |
| Pectocarya pusilla | Little pectocarya |
| Pellaea andromedifolia | Coffee fern |
| Pellaea mucronata | Common bird's foot fern |
| Penstemon heterophyllus | Foothill beardtongue |
| Pentagramma pallida | Whiteback fern |
| Pentagramma triangularis | Gold-backed fern |
| Perideridia howellii | Howell's yampah |
| Perideridia kelloggii | Kellogg's yampah |
| Petrorhagia dubia + | Grass-pink |
| Phacelia egena | Rock phacelia |
| Phacelia tanacetifolia | Tansy phacelia |
| Phalaris aquatica + | Harding-grass |
| Philadelphus lewisii ssp. californicus | Mock orange |
| Phlox gracilis | Slender phlox |
| Phoradendron villosum | Hairy mistletoe |
| Physocarpus capitatus | Ninebark |
| Pinus ponderosa | Ponderosa pine |
| Pinus sabiniana | Foothill pine (Grey pine) |
| Piperia transversa | Cross-spurred rein orchid |
| Piptatherum miliaceum + | Smilograss |
| Pistacia chinensis + | Pistachio |
| Plagiobothrys austiniae | Austin's popcorn-flower |
| Plagiobothrys canescens | Valley popcorn-flower |
| Plagiobothrys fulvus | Fulvous popcorn-flower |
| Plagiobothrys nothofulvus | Common popcorn-flower |
| Plagiobothrys tenellus | Slender Popcorn-Flower |
| Plantago elongata | Elongate plantain |
| Plantago erecta | Erect plantain |
| Plantago lanceolata + | English plantain |
| Plantago major + | Common plantain |
| Platanus racemosa | Western sycamore |
| Plectritis ciliosa ssp. ciliosa | Long-spurred pink plectritis |
| Plectritis ciliosa ssp. insignis | Short-spurred pink plectritis |
| Plectritis macrocera | White plectritis |
| Poa annua + | Annual bluegrass |
| Poa bulbosa + | Bulbous bluegrass |
| Poa compressa + | Canadian bluegrass |
| Poa howellii | Howell's bluegrass |
| Poa secunda ssp. secunda | One-sided bluegrass |
| Poa tenerrima | Delicate bluegrass |
| Polygala cornuta var. cornuta | Sierra Milkwort |
| Polygonum arenastrum + | Smartweed |
| Polygonum bidwelliae (CNPS List 4) | Bidwell's knotweed |
| Polygonum californicum | California knotweed |
| Polypodium calirhiza | California polypody |
| Polypogon australis + | Southern beardgrass |
| Polypogon interruptus + | Ditch beardgrass |
| Polypogon maritimus + | Mediterranean beardgrass |
| Polypogon monspeliensis + | Annual beardgrass |
| Polystichum imbricans ssp. imbricans | Narrow-leaved sword fern |
| Populus fremontii | Fremont's cottonwood |
| Potentilla glandulosa | Sticky cinquefoil |
| Potamogeton crispus + | Wavy-leaved pondweed |
| Potamogeton foliosus var. foliosus | Leafy pondweed |
| Prunella vulgaris var. lanceolatus | Mountain selfheal |
| Prunus cerasifera + | Cherry plum |
| Prunus subcordata | Sierra plum |
| Prunus virginiana var. demissa | Western choke cherry |
| Pseudotsuga menziesii | Douglas fir |
| Psilocarphus tenellus var. tenellus | Slender wolly-marbles |
| Ptelea crenulata | Hoptree |
| Pteridium aquilinum | Western bracken fern |
| Pterostegia drymarioides | Pterostegia (Granny's hairnet) |
| Pyrola picta | White-veined wintergreen |
| Pyrus communis + | Common pear |
| Quercus berberidifolia | Scrub oak |
| Quercus chrysolepis var. chrysolepis | Canyon live oak |
| Quercus douglasii | Blue oak |
| Quercus garryana var. breweri | Brewer oak |
| Quercus kelloggii | California black oak |
| Quercus lobata | Valley oak |
| Quercus wislizeni var. wislizeni | Interior live oak |
| Ranunculus aquatilis | Water buttercup |
| Ranunculus canus | Sacramento Valley buttercup |
| Ranunculus hebecarpus | Hairy-fruited buttercup |
| Ranunculus muricatus + | Prickle-seeded buttercup |
| Ranunculus occidentalis | Western buttercup |
| Raphanus sativus + | Wild radish |
| Rhamnus ilicifolia | Holly-leaved redberry |
| Rhamnus tomentella ssp. tomentella | Hoary coffeberry |
| Rhus trilobata | Skunkbrush |
| Ribes amarum | Bitter Gooseberry |
| Ribes nevadense | Mountain Pink Currant |
| Ribes roezlii var. roezlii | Sierra gooseberry |
| Romulea rosea var. australis + | Rosy Sand Crocus |
| Rorippa nasturtium-aquaticum | Watercress |
| Rosa californica | California rose |
| Rubus discolor + | Himalayan blackberry |
| Rubus laciniatus + | Cut-leaved blackberry |
| Rubus glaucifolius | Creeping raspberry |
| Rubus pensilvanicus + | Pennsylvania blackberry |
| Rubus ursinus | California blackberry |
| Rumex acetosella + | Common sheep sorrel |
| Rumex crispus + | Curly dock |
| Rumex pulcher + | Fiddle dock |
| Salix exigua | Narrow-leaved willow |
| Salix gooddingii | Goodding's black willow |
| Salix laevigata | Red willow |
| Salix lasiolepis | Arroyo willow |
| Sambucus mexicana | Blue elderberry |
| Sanguisorba minor + | Garden burnet |
| Sanicula bipinnata | Poison sanicle |
| Sanicula bipinnatifida | Purple sanicle |
| Sanicula crassicaulis | Pacific sanicle |
| Sanicula tuberosa | Turkey-pea |
| Saponaria officinalis + | Bouncing-bet |
| Saxifraga californica | California saxifrage |
| Saxifraga integrifolia | Hooker's saxifrage |
| Scandix pecten-veneris + | Shepherd’s needle |
| Scirpus acutus var. occidentalis | Hard-stemmed tule |
| Scleranthus annuus | Knawel |
| Scribneria bolanderi | Scribner's-Grass |
| Scrophularia californica | California figwort |
| Scutellaria californica | California skullcap |
| Scutellaria siphocampyloides | Gray-leaved skullcap |
| Scutellaria tuberosa | Danny's skullcap |
| Sedum spathulifolium | Broad-leaved stonecrop |
| Selaginella hansenii | Hansen's spikemoss |
| Selaginella wallacei | Wallace's spikemoss |
| Senecio aronicoides | California ragwort |
| Senecio sylvaticus + | Wood groundsel |
| Senecio vulgaris + | Old-man-in-the-spring |
| Sherardia arvensis + | Field-madder |
| Sidalcea calycosa ssp. calycosa | Annual checkerbloom |
| Sidalcea hartwegii | Hartweg's sidalcea |
| Sidalcea malviflora ssp. asprella | Harsh checkerbloom |
| Sidalcea robusta (CNPS 1B) | Butte County checkerbloom |
| Silene californica | Indian-pink |
| Silene gallica + | Windmill-pink |
| Silybum marianum + | Milk-thistle |
| Sisymbrium officinale + | Hedge mustard |
| Smilax californica | Greenbriar |
| Solanum parishii | Parish's nightshade |
| Solidago californica | California goldenrod |
| Solvia sessilis + | Lawn Burweed |
| Sonchus asper + | Prickly sow-thistle |
| Sonchus oleraceus + | Common sow-thistle |
| Sorghum halepense + | Johnsongrass |
| Spergularia bocconei + | Sandspurry |
| Spiranthes porrifolia | Western ladies-tresses |
| Stachys ajugoides var. rigida | Rigid hedge-nettle |
| Stachys stricta | Sonoma hedge-nettle |
| Stellaria media + | Common chickweed |
| Stellaria nitens | Shiny starwort |
| Symphoricarpos albus var. laevigatus | Common snowberry |
| Taeniatherum caput-medusae + | Medusa-head |
| Taraxacum officinale + | Dandelion |
| Tauschia hartwegii | Hartweg's tauschia |
| Thysanocarpus curvipes | Fringepod |
| Tonella tenella | Small-flowered tonella |
| Torilis arvensis + | Common hedge-parsley |
| Torilis nodosa + | Knotted hedge-parsley |
| Torreya californica | California-nutmeg |
| Toxicodendron diversilobum | Poison-oak |
| Tragopogon dubius + | Yellow Salsify |
| Tribulus terrestris + | Puncture vine |
| Trichostema lanceolatum | Vinegar-weed |
| Trientalis latifolia | Pacific starflower |
| Trifolium albopurpureum | Indian clover |
| Trifolium bifidum var. decipiens | Deceptive clover |
| Trifolium ciliolatum | Foothill clover |
| Trifolium depauperatum var. amplectens | Involucrate cowbag clover |
| Trifolium depauperatum var. depauperatum | Dwarf cowbag clover |
| Trifolium dubium + | Little hop clover |
| Trifolium glomeratum + | Sessile-headed clover |
| Trifolium hirtum + | Rose clover |
| Trifolium microcephalum | Small-headed clover |
| Trifolium subterraneum+ | Subterranean clover |
| Trifolium variegatum | White-tipped clover |
| Trifolium willdenovii | Tomcat clover |
| Trifolium wormskioldii | Springbank clover |
| Triphysaria eriantha | Johnny-tuck |
| Triphysaria pusilla | Dwarf owl-clover |
| Triteleia bridgesii | Bridge's triteleia |
| Triteleia hyacinthina | White triteleia |
| Triteleia laxa | Ithuriel's spear |
| Typha domingensis | Southern cattail |
| Umbellularia californica | California bay |
| Verbascum blattaria + | Moth mullein |
| Verbascum thapsus + | Woolly mullein |
| Verbena hastata | Halberd-leaved vervain |
| Verbena lasiostachys | Western vervain |
| Veronica persica + | Persian speedwell |
| Vicia americana | American vetch |
| Vicia sativa + | Garden vetch |
| Vicia villosa + | Winter vetch |
| Viola purpurea var quercetorum | Oakwoods violet |
| Vitis californica | California grape |
| Vulpia bromoides + | Six-week's-fescue |
| Vulpia microstachys var. ciliata | Fringed Fescue |
| Vulpia microstachys var. microstachys | Small Fescue |
| Vulpia microstachys var. pauciflora | Few-flowered fescue |
| Vulpia myuros var. hirsuta + | Foxtail fescue |
| Vulpia myuros var. myuros + | Rattail fescue |
| Woodwardia fimbriata | Giant Chain fern |
| Xanthium strumarium | Cocklebur |
| Yabea microcarpa | False hedge parsley |
| Zigadenus venenosus var. venenosus | Death camas |