Orobanchaceae (Broom-rape):

Boschniakia strobilacea (California groundcone)
Orobanche
    bulbosa (Chaparral broom-rape)
    californica ssp. feudgei (California broom-rape)
    cooperi (Cooper's broom-rape)
    fasciculata (Clustered broom-rape)
    parishii ssp. brachyloba (Short-lobed broom-rape)
    parishii ssp. parishii (Parish's broom-rape)
    uniflora (Naked broom-rape)
    valida ssp. valida (Rock Creek broom-rape)

Oxalidaceae (Oxalis):

Oxalis
    albicans (Wild oxalis)
    corniculata (Creeping wood-sorrel)*
    pes-caprae (Bermuda buttercup)*

Paeoniaceae (Peony):

Paeonia californica (Wild peony)

Papaveraceae (Poppy):

Argemone
    corymbosa (Mojave prickly poppy)
    munita (Chicalote)
Canbya candida (Pygmy poppy)
Dendromecon
    hardfordii (Channel Island tree poppy)
    rigida (Bush poppy)
Dicentra
    chrysantha (Golden ear drops)
    ochroleuca (Bleeding hearts)
Eschscholzia
    caespitosa (Collarless California poppy)
    californica (California poppy)
    glyptosperma (Desert gold poppy)
    minutiflora (Little gold poppy)
    parishii (Parish's poppy)
Meconella denticulata (Small-flowered meconella)
Papaver californicum (Fire poppy)
Platystemon californicus (Cream cups)
Romneya
    coulteri (Matilija poppy)
    trichocalyx (Bristly matilija poppy)
Stylomecon heterophylla (Wind poppy)

Parmeliaceae:

Evernia prunastri (Oak moss lichen)

Passifloraceae (Passionflower):

Passiflora sp. (Passionflower)**


Philadelphaceae (Mock orange):

Philadelphus microphyllus (Little-leaved mock orange)

Phytolaccaceae (Pokeweed):

Phytolacca americana (Pokeweed)*

Pinaceae (Pine):

Abies concolor (White fir)
Pinus
    attenuata (Knobcone pine)
    contorta ssp. murrayana (Lodgepole pine)
    coulteri (Coulter pine)
    flexilis (Limber pine)
    halepensis (Aleppo pine)*
    jeffreyi (Jeffrey pine)
    lambertiana (Sugar pine)
    longaeva (Bristlecone pine)
    monophylla (Singleleaf pinyon pine)
    muricata (Bishop pine)
    ponderosa (Yellow pine)
    quadrifolia (Four-needle pinyon pine)
    sabiniana (Gray pine)
    torreyana (Torrey pine)
Pseudotsuga macrocarpa (Bigcone spruce)

Plantaginaceae (Plantain):

Plantago
    coronopus (Cut-leaf plantain)*
    elongata (Longleaf plantain)
    erecta (California plantain)
    lanceolata (English plantain)*
    major (Broadleaf plantain)*
    ovata (Woolly plantain)
    patagonica (Patagonia plantain)

Platanaceae (Sycamore):

Platanus racemosa (Western sycamore)

Plumbaginaceae (Leadwort):

Armeria maritima ssp. californica (California sea-pink)
Limonium
    californicum (Sea-lavender)
    sinuatum (Statice)**
Plumbago auriculata (Cape plumbago)**

Poaceae (Grass):

Achnatherum
    aridum (Mormon needlegrass)
    coronatum (Giant stipa)
    diegoense (San Diego County needlegrass)
    hymenoides (Indian ricegrass)
    parishii (Parish's needlegrass)
    speciosum (Desert needlegrass)
Aegilops cylindrica (Jointed goatgrass)*
Agropyron desertorum (Desert crested wheatgrass)*
Agrostis
    idahoensis (Idaho bentgrass)
    pallens (Seashore bentgrass)
    viridis (Green bentgrass)*
Aristida
    adscensionis (Three-awn)
    purpurea var. nealleyi (Nealley three-awn)
Arundo donax (Giant reed)*
Avena
    barbata (Slender oats)*
    fatua (Common wild oats)*
Bouteloua
    aristidoides (Needle grama)
    eriopoda (Black grama)
    gracilis (Blue grama)
    trifida (Red grama)
Brachypodium distachyon (Purple false-brome)*
Bromus
    carinatus var. carinatus (California brome)
    carinatus var. maritimus (Seaside brome)
    diandrus (Ripgut brome)*
    hordeaceus (Soft chess)*
    madritensis ssp. rubens (Red brome)*
    tectorum (Cheat grass)*
    trinii (Chilean chess)*
Cortaderia selloana (Pampas grass)*
Cynodon dactylon (Bermuda grass)*
Deschampsia elongata (Slender hairgrass)
Distichlis spicata (Salt grass)
Elymus
    elymoides ssp. brevifolius (Short-leaved squirreltail)
    elymoides ssp. californicus (California squirreltail)
    glaucus ssp. glaucus (Blue wildrye)
    glaucus ssp. jepsonii (Jepson's blue wildrye)
Elytrigia
    intermedia ssp. intermedia (Intermediate wheatgrass)*
    pontica ssp. pontica (Tall wheatgrass)*
Erioneuron pulchellum (Fluffgrass)
Festuca arundinacea (Tall fescue)*
Gastridium ventricosum (Nit grass)*
Hordeum
    brachyantherum ssp. californicum (Meadow barley)
    intercedens (Bobtain barley)
    murinum ssp. glaucum (Foxtail barley)*
    murinum ssp. leporinum (Hare barley)*
Koeleria macrantha (Junegrass)
Lamarckia aurea (Goldentop grass)
Leymus
    cinereus (Great Basin wildrye)
    condensatus (Giant wildrye)
    pacificus (Pacific wildrye)
    triticoides (Creeping wildrye)*
Lolium
    multiflorum (Italian ryegrass)*
    temulentum (Darnel)*
Melica
    frutescens (Tall melica)
    imperfecta (Coast range melic)
Monanthochloe littoralis (Shoregrass)
Muhlenbergia
    porteri (Bush muhly)
    rigens (Deergrass)
Nassella
    cernua (Nodding needlegrass)
    lepida (Foothill needlegrass)
    pulchra (Purple needlegrass)
Panicum urvilleanum (Desert panic grass)
Parapholis incurva (Curved sicklegrass)*
Paspalum
    dilatatum (Dallis grass)*
    distichum (Knot grass)
Pennisetum
    clandestinum (Kikuyu grass)*
    setaceum (Fountaingrass)*
Phalaris aquatica (Harding grass)*
Phleum alpinum (Mountain timothy)
Piptatherum miliaceum (Smilo grass)*
Pleuraphis rigida (Big galleta grass)
Poa
    atropurpurea (San Bernardino bluegrass)
    bulbosa (Bulbous bluegrass)*
    douglasii (Sand-dune bluegrass)
    fendleriana ssp. longiligula (Fendler's bluegrass)
    secunda ssp. juncifolia (Rush bluegrass)
    secunda ssp. secunda (One-sided bluegrass)
Polypogon
    interruptus (Ditch beard grass)*
    monspeliensis (Rabbitsfoot grass)*
Schismus barbatus (Common Mediterranean grass)*
Spartina foliosa (Cord grass)
Sporobolus airoides (Alkali sacaton)
Swallenia alexandrae (Eureka Valley dune grass)
Tridens muticus (Slim tridens)
Triticum aestivum (Common wheat)*
Vulpia
    myuros var. hirsuta (Rattail fescue)*
    octoflora var. hirtella (Six-weeks fescue)
    octoflora var. octoflora (Slender fescue)

Polemoniaceae (Phlox):

Allophyllum
    divaricatum (Purple false-gilia)
    gilioides ssp. gilioides (Dense false-gilia)
    gilioides ssp. violaceum (Violet false-gilia)
    glutinosum (Sticky false-gilia)
    integrifolium (White false-gilia)
Collomia
    grandiflora (Large-flowered collomia)
    linearis (Slenderleaf collomia)
Eriastrum
    densifolium ssp. austromontanum (Southern mountain woolstar)
    densifolium ssp. mohavense (Mojave woolstar)
    densifolium ssp. sanctorum (Santa Ana River woolstar)
    diffusum (Miniature woolstar)
    eremicum ssp. eremicum (Desert woolstar)
    harwoodii (Harwood's woolstar)
    sapphirinum (Sapphire woolstar)
    sparsiflorum (Few-flowered woolstar)
    wilcoxii (Wilcox's woolstar)
Gilia
    aliquanta ssp. aliquanta (Puff-calyx gilia)
    aliquanta ssp. breviloba (Western gilia)
    angelensis (Chaparral gilia)
    australis (Southern gilia)
    brecciarum ssp. neglecta (Argus gilia)
    campanulata (Bell gilia)
    cana ssp. triceps (Showy gilia)
    capitata ssp. abrotanifolia (Globe gilia)
    caruifolia (Caraway-leaved gilia)
    clokeyi (Clokey's gilia)
    diegensis (San Diego gilia)
    filiformis (Threadstem gilia)
    hutchinsifolia (Desert pale gilia)
    latiflora ssp. latiflora (Broad-flowered gilia)
    latiflora ssp. davyi (Davy gilia)
    latifolia (Broadleaf gilia)
    leptantha ssp. leptantha (Fine-flower gilia)
    leptantha ssp. transversa (Transverse fine-flower gilia)
    leptomeria (Great Basin gilia)
    minor (Little gilia)
    modocensis (Modoc gilia)
    ochroleuca ssp. exilis (Slender volcanic gilia)
    ochroleuca ssp. vivida (Volcanic gilia)
    ophthalmoides (Eyed gilia)
    scopulorum (Rock gilia)
    sinuata (Rosy gilia)
    splendens ssp. grantii (Grant's gilia)
    splendens ssp. splendens (Splendid gilia)
    stellata (Star gilia)
    transmontana (Transmontane gilia)
    tricolor (Birdseye gilia)
    triodon (Sand gilia)
Ipomopsis
    polycladon (Spreading gilia)
Langloisia
    setosissima ssp. punctata (Lilac sunbonnets)
    setosissima ssp. setosissima (Bristly langloisia)
Leptodactylon
    californicum (Prickly phlox)
    jaegeri (San Jacinto prickly phlox)
    pungens (Mountain prickly phlox)
Linanthus
    aureus ssp. aureus (Golden gilia)
    aureus ssp. decorus (Cream gilia)
    breviculus (Mojave linanthus)
    ciliatus (Whiskerbrush)
    concinnus (San Gabriel linanthus)
    demissus (Desert linanthus)
    dianthiflorus (Ground pink)
    floribundus ssp. glaber (Summer snow linanthus)
    floribundus ssp. hallii (Santa Rosa Mountains linanthus)
    jonesii (Jones' linanthus)
    killipii (Baldwin Lake linanthus)
    liniflorus (Flax-flowered linanthus)
    maculatus (Little San Bernardino Mountains linanthus)
    parryae (Parry's linanthus)
    parviflorus (Common linanthus)
    pygmaeus ssp. continentalis (Pygmy linanthus)
Loeseliastrum
    matthewsii (Desert calico)
    schottii (Schott's calico)
Navarretia
    atractyloides (Hollyleaf navarretia)
    breweri (Brewer's navarretia)
    fossalis (Spreading navarretia)
    hamata ssp. hamata (Hooked navarretia)
    ojaiensis (Ojai navarretia)
    prostrata (Prostrate navarretia)
Phlox
    austromontana (Southern mountain phlox)
    condensata (Condensed phlox)
    diffusa (Spreading phlox)
    dolichantha (Big Bear Valley phlox)
    gracilis [ssp. gracilis] (Common slender phlox)
    gracilis [ssp. humilis] (Laguna slender phlox)
    stansburyi (Stansbury phlox)

Polygalaceae (Milkwort):

Polygala cornuta var. fishiae (Fish's milkwort)

Polygoniaceae (Buckwheat):

Centrostegia thurberi (Thurber's spineflower)
Chorizanthe
    brevicornu var. brevicornu (Brittle spineflower)
    fimbriata var. fimbriata (Fringed spineflower)
    fimbriata var. laciniata (Lace-fringed spineflower)
    parryi var. fernandina (San Fernando Valley spineflower)
    procumbens (Prostrate spineflower)
    rigida (Rigid spineflower)
    spinosa (Mojave spineflower)
    staticoides (Turkish rugging)
    watsonii (Watson's spineflower)
    xanti var. leucotheca (Riverside spineflower)
Dedeckera eurekensis (July gold)
Emex spinosa (Devil's thorn)*
Eriogonum
    angulosum (Angled-stem buckwheat)
    apiculatum (San Jacinto buckwheat)
    arborescens (Santa Cruz Island buckwheat)
    cinereum (Ashyleaf buckwheat)
    contiguum (Reveal's buckwheat)
    crocatum (Conejo buckwheat )
    davidsonii (Davidson's buckwheat)
    deflexum (Flatcrown buckwheat )
    deserticola (Dune buckwheat)
    elongatum var. elongatum (Longstem buckwheat)
    eremicola (Wildrose Canyon buckwheat)
    fasciculatum var. fasciculatum (California buckwheat)
    fasciculatum var. flavoviride (East Mojave buckwheat)
    fasciculatum var. foliolosum (Leafy buckwheat)
    fasciculatum var. polifolium (Desert wild buckwheat)
    giganteum (St. Catherine's lace)
    gilmanii (Gilman's buckwheat)
    gracile var. gracile (Slender buckwheat)
    grande var. grande (Island buckwheat)
    grande var. rubescens (Red-flowered buckwheat)
    heermannii var. argense (Heermann's buckwheat)
    heermannii var. floccosum (Heermann's buckwheat)
    inflatum (Desert trumpet)
    kennedyi var. alpigenum (Southern alpine buckwheat)
    kennedyi var. austromontanum (Southern mountain buckwheat)
    kennedy var. kennedyi (Kennedy's buckwheat)
    maculatum (Spotted buckwheat)
    microthecum var. johnstonii (Johnston's buckwheat)
    molestum (Pineland buckwheat)
    nidularium (Birdnest buckwheat)
    nudum var. pauciflorum (Few-flowered naked buckwheat)
    nudum var. westonii (Weston's buckwheat)
    ovalifolium var. ovalifolium (Oval-leaved buckwheat)
    ovalifolium var. vineum (Cushenbury buckwheat)
    palmerianum (Palmer's buckwheat)
    panamintense (Panamint buckwheat)
    parishii (Parish's buckwheat)
    parvifolium (Seacliff buckwheat)
    plumatella (Flat-topped buckwheat)
    pusillum (Yellow turban)
    reniforme (Kidney-leaved buckwheat)
    rixfordii (Rixford's buckwheat)
    saxatile (Rock buckwheat)
    thomasii (Thomas' buckwheat)
    thornei (Thorne's buckwheat)
    trichopes var. trichopes (Little trumpet)
    umbellatum var. minus (Alpine sulpher-flowered buckwheat)
    umbellatum var. munzii (Munz's buckwheat)
    umbellatum var. nevadense (Nevada buckwheat)
    umbellatum var. subaridum (Sulpher-flowered buckwheat)
    umbellatum var. versicolor (Varicolored buckwheat)
    wrightii var. membranaceum (Wright's buckwheat)
    wrightii var. nodosum (Knotty buckwheat)
    wrightii var. subscaposum (Wright's buckwheat)
    wrightii var. wrightii (Wright's buckwheat)
Oxytheca
    caryophylloides (Chickweed oxytheca)
    emarginata (Whitemargin oxytheca)
    parishii var. parishii (Parish's oxytheca)
    perfoliata (Roundleaf oxytheca)
    trilobata (Threelobe oxytheca)
Polygonum
    amphibium var. emersum (Swamp knotweed)
    arenastrum (Common knotweed)*
    bistortoides (Western bistort)
    capitatum (Himalayan smartweed)*
    douglasii (Douglas's knotweed)
    lapathifolium (Willow smartweed)
    punctatum (Water smartweed)
Pterostegia drymarioides (Threadstem)
Rumex
    conglomeratus (Whorled dock)*
    crispus (Curly dock)*
    hymenosepalus (Wild rhubarb)
    pulcher (Fiddle dock)*
    salicifolius var. denticulatus (Willow-leaved dock)

Polypodiaceae (Polypody):

Polypodium
    californicum (California polypody)
    hesperium (Western polypody)

Portulacaceae (Purslane):

Calandrinia
    breweri (Brewer's red maids)
    ciliata (Red maids)
    maritima (Seaside red maids)
Calyptridium
    monandrum (Sand cress)
    monospermum (Pussypaws)
    parryi var. parryi (Parry's pussypaws)
Claytonia
    exigua ssp. exigua (Little spring beauty)
    parviflora ssp. parviflora (Narrow-leaf miner's lettuce)
    parviflora ssp. viridis (Green miner's lettuce)
    perfoliata ssp. mexicana (Southern miner's lettuce)
    perfoliata ssp. perfoliata (Miner's lettuce)
Lewisia
    nevadensis (Sierra lewisia)
    pygmaea (Dwarf lewisia)
    rediviva (Bitterroot)
Montia chamissoi (Toad lily)
Portulaca
    halimoides (Desert portulaca)
    oleracea (Purslane)*

Primulaceae (Primrose):

Anagallis arvensis (Scarlet pimpernel)*
Centunculus minimus (Common chaffweed)
Dodecatheon
    alpinum (Alpine shooting star)
    clevelandii ssp. clevelandii (Shooting star)
    clevelandii ssp. insulare (Island shooting star)
    hendersonii (Foothill shooting star)
    redolens (Fragrant shooting star)
Samolus parviflorus (Water-pimpernel)

Pteridaceae (Brake):

Adiantum
    aleuticum (Five-finger maidenhair fern)
    capillus-veneris (Maidenhair fern)
    jordanii (California maidenhair fern)
Argyrochosma jonesii (Jones' cloak fern)
Aspidotis californica (California lace fern)
Astrolepis cochisensis (Scaly cloak fern)
Cheilanthes
    clevelandii (Cleveland's lipfern)
    covillei (Coville's lipfern)
    feei (Slender lipfern)
    newberryi (Cotton fern)
    parryi (Parry's lipfern)
    viscida (Viscid lipfern)
Notholaena californica (California cloak fern)
Pentagramma
    triangularis ssp. triangularis (Goldback fern)
    triangularis ssp. viscosa (Silverback fern)
Pellaea
    andromedifolia (Coffee fern)
    mucronata var. californica (California cliff brake)
    mucronata var. mucronata (Bird's-foot fern)
    truncata (Cliff brake)
Pteris vittata (Ladder brake)*


Rafflesiaceae (Rafflesia):

Pilostyles thurberi (Thurber's stemsucker)

Ranunculaceae (Buttercup):

Aquilegia formosa (Columbine)
Clematis
    lasiantha (Pipestems)
    ligusticifolia (Virgin's bower)
    pauciflora (Ropevine)
Delphinium
    cardinale (Scarlet larkspur)
    parishii ssp. pallidum (Pale larkspur)
    parishii ssp. parishii (Desert larkspur)
    parryi ssp. parryi (Blue larkspur)
    patens ssp. hepaticoideum (Spreading larkspur)
Ranunculus
    alismifolius var. alismellus (Small water-plantain buttercup)
    aquatilis var. capillaceus (Water buttercup)
    californicus (California buttercup)
    cymbalaria var. saximontanus (Rocky Mountain buttercup)
    occidentalis (Western buttercup)
    sceleratus (Cursed crowfoot)
Thalictrum fendleri var. polycarpum (pistillate flowers) (Meadow-rue)
Thalictrum fendleri var. polycarpum (staminate flowers) (Meadow-rue)