Oak,
Blue (Quercus douglasii)
Brewer's (Quercus garryana var. breweri)
California black (Quercus kelloggii)
Canyon live (Quercus
chrysolepis)
Channel Island scrub (Quercus pacifica)
Coast live (Quercus
agrifolia var. agrifolia)
Desert scrub (Quercus john-tuckeri)
Engelmann (Quercus engelmannii)
Inland scrub (Quercus
berberidifolia)
Interior live (Quercus wislizeni var.
wislizeni)
Island (Quercus tomentella)
Muller's (Quercus cornelius-mulleri)
Palmer's (Quercus palmeri)
San Gabriel Mountains leather (Quercus
durata var. gabrielensis)
Shrub live (Quercus turbinella)
Shrubby interior live (Quercus
wislizeni var. frutescens)
Southern coast live (Quercus agrifolia
var. oxyadenia)
Tanbark (Lithocarpus densiflorus)
Torrey's scrub (Quercus acutidens)
Oak gooseberry (Ribes quercetorum)
Oak mistletoe (Phoradendron
villosum)
Oak moss lichen (Evernia prunastri)
Oak violet (Viola purpurea
ssp. quercetorum)
Oats,
Common wild (Avena fatua)*
Slender (Avena barbata)*
Ocotillo (Fouquieria splendens
var. splendens)
Oenanthe, Pacific (Oenanthe sarmentosa)
Ojai navarretia (Navarretia ojaiensis)
Oleander (Nerium oleander)**
Oligomeris (Oligomeris linifolia)
Olive, Desert (Forestiera pubescens)
One-sided bluegrass (Poa secunda ssp.
secunda)
Onion,
Burlew's (Allium burlewii)
Davis's pitted (Allium lacunosum var.
davisiae)
Early (Allium praecox)
Fringed (Allium
fimbriatum var. fimbriatum)
Mt. Pinos (Allium howellii var. clokeyi)
Narrow-leaved (Allium amplectens)
Parry's fringed (Allium parryi)
Peninsular (Allium peninsulare var. peninsulare)
Red-skinned (Allium
haematochiton)
San Bernardino mountain (Allium
monticola)
Sierra (Allium campanulatum)
Wild (Allium atrorubens
var. atrorubens)
Onionweed (Asphodelus fistulosus)*
Orange clock vine (Thunbergia gregorii)**
Orchid,
Alaska rein (Piperia unalascensis)
Dense-flowered rein (Piperia elongata)
Rein (Piperia cooperi)
Royal rein (Piperia unalascensis)
Stream (Epipactis gigantea)
White-flowered bog (Platanthera
leucostachys)
Orchid rock-rose (Cistus Xpurpureus)*
Orcutt's bird's beak (Cordylanthus orcuttianus)
Orcutt's brodiaea (Brodiaea orcuttii)
Orcutt's dudleya (Dudleya attenuata ssp.
orcuttii)
Orcutt's woody-aster (Xylorhiza orcuttii)
Oregon willow-herb (Epilobium oregonense)
Oriental mustard (Sisymbrium orientale)*
Oso berry (Oemleria cerasiformis)
Otay manzanita (Arctostaphylos otayensis)
Otay Mesa mint (Pogogyne nudiuscula)
Otay tarplant (Hemizonia conjugens)
Oval-leaved buckwheat (Eriogonum ovalifolium
var. ovalifolium)
Owl's clover,
Dense-flowered (Castilleja densiflora)
Purple (Castilleja
exserta ssp. exserta)
San Bernardino Mountains (Castilleja
lasiorhyncha)
Oxalis, Wild (Oxalis albicans)
Ox-eye daisy (Leucanthemum vulgare)*
Oxytheca,
Chickweed (Oxytheca caryophylloides)
Parish's (Oxytheca
parishii var. parishii)
Roundleaf (Oxytheca perfoliata)
Threelobe (Oxytheca trilobata)
Pacific blazing star (Mentzelia obscura)
Pacific madrone (Arbutus menziesii)
Pacific ninebark (Physocarpus
capitatus)
Pacific rush (Juncus effusus var. pacificus)
Pacific saltbush (Atriplex pacifica)
Pacific sanicle (Sanicula crassicaulis)
Pacific wildrye (Leymus pacificus)
Paintbrush,
Ashy-gray (Castilleja cinerea)
Desert (Castilleja linariifolia)
Desert indian (Castilleja
angustifolia)
Dwarf alpine (Castilleja nana)
Frosted indian (Castilleja
pruinosa)
Great red (Castilleja miniata)
Indian (Castilleja
affinis ssp. affinis)
Island (Castilleja lanata ssp. hololeuca)
Lesser indian (Castilleja minor
ssp. spiralis)
Martin's (Castilleja applegatei ssp.
martinii)
Soft-leaved indian (Castilleja
mollis)
Woolly indian (Castilleja foliolosa)
Yellow (Castilleja plagiotoma)
Pale larkspur (Delphinium parishii ssp. pallidum)
Pale primrose (Camissonia pallida ssp. pallida)
Pale yellow lupine (Lupinus luteolus)
Palmer beadpod (Lesquerella tenella)
Palmer's buckwheat (Eriogonum palmerianum)
Palmer's ceanothus (Ceanothus palmeri)
Palmer's crinklemat (Tiquilia palmeri)
Palmer's frankenia (Frankenia palmeri)
Palmer's goldenbush (Ericameria palmeri
var. pachylepis)
Palmer's grappling hook (Harpagonella
palmeri)
Palmer's mariposa lily (Calochortus
palmeri var. palmeri)
Palmer's milkvetch (Astragalus palmeri)
Palmer's monkeyflower (Mimulus palmeri)
Palmer's oak (Quercus palmeri)
Palmer's penstemon (Penstemon palmeri
var. palmeri)
Palmer's sagewort (Artemisia palmeri)
Palo verde
[Common] (Cercidium floridum
ssp. floridum)
[Common] fruit (Cercidium floridum ssp. floridum)
Littleleaf (Cercidium microphyllum)
Pampasgrass (Cortaderia selloana)*
Panamint buckwheat (Eriogonum panamintense)
Panamint butterfly bush (Buddleja
utahensis)
Panamint daisy (Enceliopsis covillei)
Panamint milkvetch (Astragalus panamintensis)
Panamint phacelia (Phacelia perityloides
var. perityloides)
Panamint prince's plume (Stanleya
elata)
Pancake prickly pear (Opuntia chlorotica)
Paperbag bush (Salazaria
mexicana)
Paperflower (Psilostrophe
cooperi)
Papillate dodder (Cuscuta californica
var. papillosa)
Parish's bedstraw (Galium parishii)
Parish's bluecurls (Trichostema parishii)
Parish's broom-rape (Orobanche parishii ssp. parishii)
Parish's buckwheat (Eriogonum parishii)
Parish's catchfly (Silene parishii)
Parish's fleabane (Erigeron
parishii)
Parish's goldenbush (Ericameria
parishii var. parishii)
Parish's jacumba milkvetch (Astragalus
douglasii var. parishii)
Parish's lupine (Lupinus
latifolius var. parishii)
Parish's meadowfoam (Limnanthes gracilis
ssp. parishii)
Parish's monkeyflower (Mimulus parishii)
Parish's needlegrass (Achnatherum parishii)
Parish's nightshade (Solanum parishii)
Parish's oxytheca (Oxytheca parishii)
Parish's poppy (Eschscholzia parishii)
Parish's psoralea (Rupertia rigida)
Parish's rock-cress (Arabis parishii)
Parish's sagebrush (Artemisia tridentata
ssp. parishii)
Parish's tauschia (Tauschia parishii)
Parish's viguiera (Viguiera parishii)
Parish's yampah,
[Common] (Perideridia parishii ssp. parishii)
Wide-leaved (Perideridia
parishii ssp. latifolia)
Parry's collinsia (Collinsia parryi)
Parry's fringed onion (Allium parryi)
Parry's green-gentian (Swertia parryi)
Parry's hulsea (Hulsea vestita ssp. parryi)
Parry's jepsonia (Jepsonia
parryi)
Parry's linanthus (Linanthus
parryae)
Parry's lipfern (Cheilanthes parryi)
Parry's manzanita
(Arctostaphylos parryana ssp. deserticum)
(Arctostaphylos parryana ssp. parryana)
Parry's nolina (Nolina parryi)
Parry's phacelia (Phacelia
parryi)
Parry's pussypaws (Calyptridium parryi
var. parryi)
Parry's rabbitbrush (Chrysothamnus parryi
ssp. asper)
Parry's spurge (Chamaesyce parryi)
Parry's tetracoccus (Tetracoccus dioicus)
Parry's wild parsley (Lomatium parryi)
Parsley,
Desert (Lomatium mohavense)
Parry's wild (Lomatium parryi)
Passionflower (Passiflora sp.)**
Patagonia plantain (Plantago patagonica)
Payson's jewelflower (Caulanthus simulans)
Pea,
Chaparral (Pickeringia montana var. montana)
Desert rock (Lotus
rigidus)
Woolly chaparral (Pickeringia montana
var. tomentosa)
Peach, Desert (Prunus andersonii)
Pearlwort,
Alpine (Sagina
saginoides)
Dwarf (Sagina apetala)*
Pebble pincushion (Chaenactis carphoclinia
var. carphoclinia)
Pectocarya,
Bristly (Pectocarya setosa)
Broad-fruited (Pectocarya platycarpa)
Curvenut (Pectocarya
recurvata)
Hairy-leaved (Pectocarya heterocarpa)
Slender (Pectocarya linearis ssp. ferocula)
Winged (Pectocarya penicillata)
Pedicellate phacelia (Phacelia pedicellata)
Peirson's brown-eyed primrose (Camissonia
claviformis ssp. peirsonii)
Pelargonium (Pelargonium sp.)**
Pellitory (Parietaria hespera var. hespera)
Pencil cholla (Opuntia ramosissima)
Peninsular manzanita (Arctostaphylos
peninsularis)
Peninsular onion (Allium peninsulare var.
peninsulare)
Pennyroyal,
California false (Hedeoma nanum ssp. californicum)
Desert (Monardella
exilis)
Rock (Monardella robisonii)
Penstemon,
Beaked (Penstemon rostriflorus)
Desert (Penstemon pseudospectabilis)
Firecracker (Penstemon
eatonii var. undosus)
Foothill (Penstemon
heterophyllus var. australis)
Foothill (Penstemon
heterophyllus var. heterophyllus)
Grinnell's (Penstemon
grinnellii var. grinnellii)
Grinnell's (Penstemon grinnellii var. scrophularioides)
Heartleaf (Keckiella cordifolia)
Little-leaved yellow (Keckiella antirrhinoides var. microphylla)
Mountain blue (Penstemon laetus var. laetus)
Palmer's (Penstemon palmeri var. palmeri)
Royal (Penstemon
speciosus)
Showy (Penstemon spectabilis var. spectabilis)
Showy (Penstemon
spectabilis var. subviscosus)
Thurber (Penstemon thurberi)
Utah (Penstemon utahensis)
Whorl-leaf (Keckiella ternata var.
ternata)
Yellow (Keckiella antirrhinoides var.
antirrhinoides)
Pentachaeta,
Golden-rayed (Pentachaeta aurea)
Lyon's (Pentachaeta lyonii)
Peony, Wild (Paeonia californica)
Pepper,
Brazilian (Schinus terebinthifolius)*
Peruvian (Schinus molle)*
Peruvian, fruit (Schinus molle)*
Peppergrass,
Hairy-podded (Lepidium lasiocarpum
var. lasiocarpum)
Perennial (Lepidium latifolium)*
Robinson's (Lepidium virginicum var.
robinsonii)
Shiny (Lepidium nitidum var. nitidum)
Wild (Lepidium virginicum var. pubescens)
Yellow (Lepidium
flavum var. flavum)
Perennial chickweed (Cerastium fontanum
ssp. vulgare)*
Perennial peppergrass (Lepidium latifolium)*
Perennial rock-cress (Arabis perennans)
Perennial sweet pea (Lathyrus latifolius)*
Perezia (Acourtia microcephala)
Periwinkle (Vinca major)*
Persian speedwell (Veronica persica)*
Peruvian pepper (Schinus molle)*
Peruvian pepper fruit (Schinus molle)*
Petty spurge (Euphorbia peplus)*
Phacelia,
Aven Nelson's (Phacelia anelsonii)
Branching (Phacelia
ramosissima var. latifolia)
Branching (Phacelia
ramossisima var. ramossisima)
Caltha-leaved (Phacelia
calthifolia)
Caterpillar (Phacelia
cicutaria var. hispida)
Changeable (Phacelia mutabilis)
Charlotte's (Phacelia nashiana)
Common (Phacelia distans)
Curved-stem (Phacelia curvipes)
Davidson's (Phacelia davidsonii)
Death Valley (Phacelia vallis-mortae)
Douglas (Phacelia douglasii)
Fremont's (Phacelia
fremontii)
Great Valley (Phacelia ciliata)
Hiddenflower (Phacelia cryptantha)
Hubby's caterpillar (Phacelia
cicutaria var. hubbyi)
Imbricate (Phacelia imbricata ssp. patula)
Ives' (Phacelia ivesiana)
Large-flowered (Phacelia
grandiflora)
Limestone (Phacelia affinis)
Longstalk (Phacelia
longipes)
Low (Phacelia humilis
var. dudleyi)
Mojave (Phacelia mohavensis)
Mountain (Phacelia
imbricata ssp. imbricata)
Northern Channel Islands (Phacelia
insularis var. insularis)
Notchleaf (Phacelia
crenulata var. ambigua)
Panamint (Phacelia perityloides var.
perityloides)
Parry's (Phacelia
parryi)
Rock (Phacelia egena)
Round-leaved (Phacelia
rotundifolia)
Smallflower notchleaf (Phacelia
crenulata var. minutiflora)
Southern mountain (Phacelia austromontana)
Sticky (Phacelia
viscida)
Tansy (Phacelia tanacetifolia)
Thick-leaved (Phacelia
pachyphylla)
Timberline (Phacelia hastata ssp. hastata)
Yellow-throated (Phacelia brachyloba)
Phlox,
Big Bear Valley (Phlox dolichantha)
Common slender (Phlox gracilis [ssp.
gracilis])
Condensed (Phlox condensata)
Laguna slender (Phlox
gracilis [ssp. humilis])
Southern mountain (Phlox austromontana)
Spreading (Phlox diffusa)
Stansbury (Phlox stansburyi)
Phlox-leaved bedstraw,
(Galium andrewsii ssp. andrewsii)
(Galium andrewsii ssp. intermedium)
Pickleweed, Virginia (Salicornia virginica)
Pigweed amaranth (Amaranthus albus)*
Pincushion,
Esteve (Chaenactis stevioides)
Fremont's (Chaenactis
fremontii)
Large-flowered (Chaenactis macrantha)
Pebble (Chaenactis carphoclinia var.
carphoclinia)
Santolina (Chaenactis santolinoides)
White (Chaenactis
artemisiifolia)
Xantus (Chaenactis xantiana)
Yellow (Chaenactis
glabriuscula var. glabriuscula)
Pine,
Aleppo (Pinus halapensis)*
Bishop (Pinus muricata)
Bristlecone (Pinus longaeva)
Coulter (Pinus coulteri)
Four-needle pinyon (Pinus quadrifolia)
Gray (Pinus sabiniana)
Jeffrey (Pinus jeffreyi)
Knobcone (Pinus attenuata)
Limber (Pinus flexilis)
Lodgepole (Pinus contorta ssp. murrayana)
Singleleaf pinyon (Pinus monophylla)
Sugar (Pinus lambertiana)
Torrey (Pinus torreyana)
Yellow (Pinus ponderosa)
Pine dwarf mistletoe (Arceuthobium
campylopodum)
Pine goldenbush (Ericameria pinifolia)
Pine green-gentian (Swertia
neglecta)
Pine lousewort (Pedicularis semibarbata)
Pine rock-cress (Arabis holboellii var.
pinetorum)
Pine violet (Viola lobata ssp. lobata)
Pineapple guava (Feijoa sellowiana)**
Pineapple weed (Chamomilla suaveolens)*
Pinedrops (Pterospora andromedea)
Pinegrove groundsmoke (Gayophytum
oligospermum)
Pineland buckwheat (Eriogonum molestum)
Pinewoods cryptantha (Cryptantha simulans)
Pinewoods fritillary (Fritillaria
pinetorum)
Pink,
Ground (Linanthus dianthiflorus)
Indian (Silene laciniata
ssp. major)
Windmill (Silene
gallica)*
Pink alumroot (Heuchera rubescens var. alpicola)
Pink cudweed (Gnaphalium ramosissimum)
Pink fairy duster (Calliandra
eriophylla)
Pink rock-rose (Cistus creticus)*
Pink sand verbena (Abronia
umbellata ssp. umbellata)
Pink-bracted manzanita (Arctostaphylos
pringlei ssp. drupacea)
Pink-flowered bush mallow (Malacothamnus
marrubioides)
Pin-point clover (Trifolium
gracilentum var. gracilentum)
Pipestems (Clematis lasiantha)
Pipestems achenes (Clematis
lasiantha)
Pitch trefoil (Bituminaria bituminosa)*
Pitcher sage,
Fragrant (Lepechinia fragrans)
Heartleaf (Lepechinia cardiophylla)
Plain mariposa lily (Calochortus
invenustus)
Plain mariposa lily (blue form) (Calochortus
invenustus)
Plantain,
California (Plantago
erecta)
Cut-leaf (Plantago
coronopus)*
English (Plantago
lanceolata)*
Longleaf (Plantago elongata)
Patagonia (Plantago
patagonica)
Water (Alisma plantago-aquatica)
Woolly (Plantago ovata)
Plectritis, Long-spurred (Plectritis
ciliosa ssp. insignis)
Plume acacia (Albizia lophantha)*
Plummer's baccharis (Baccharis plummerae
ssp. plummerae)
Plummer's mariposa lily (Calochortus
plummerae)
Poison hemlock (Conium maculatum)*
Poison oak, Western (Toxicodendron
diversilobum)
Poison sanicle (Sanicula bipinnata)
Pokeweed (Phytolacca americana)*
Polished blazing star (Mentzelia polita)
Polypody,
California (Polypodium californicum)
Western (Polypodium hesperium)
Pomona locoweed (Astragalus
pomonensis)
Pondweed, Diverse-leaved (Potamogeton diversifolius)
Poodle-dog bush (Turricula parryi)
Poor man's timothy (Iva hayesiana)
Popcorn flower,
Adobe (Plagiobothrys acanthocarpus)
Arizona (Plagiobothrys
arizonicus)
California (Plagiobothrys collinus
var. fulvescens)
Cleveland's (Cryptantha clevelandii)
Hooked (Plagiobothrys undulatus)
Large-flowered (Cryptantha
intermedia)
Mojave (Plagiobothrys jonesii)
Prickly (Cryptantha echinella)
Rusty-haired (Plagiobothrys
nothofulvus)
Tawny (Plagiobothrys
fulvus)
Valley (Plagiobothrys canescens)
Poppy,
Bush (Dendromecon rigida)
California (Eschscholzia
californica)
Channel Island tree (Dendromecon
harfordii)
Collarless California (Eschscholzia
caespitosa)
Desert gold (Eschscholzia glyptosperma)
Fire (Papaver californicum)
Little gold (Eschscholzia minutiflora)
Matilija (Romneya
coulteri)
Mojave prickly (Argemone corymbosa)
Parish's (Eschscholzia parishii)
Pygmy (Canbya candida)
Wind (Stylomecon heterophylla)
Poreleaf, Slender (Porophyllum gracile)
Portuguese broom (Cytisus striatus)*
Portulaca, Desert (Portulaca halimoides)
Poverty weed,
[Common] (Iva axillaris ssp. robustior)
Nuttall's (Monolepis nuttalliana)
Prickleleaf, Shockley's (Hecastocleis
shockleyi)
Pricklepoppy, Mojave (Argemone corymbosa)
Prickly cryptantha (Cryptantha muricata)
Prickly lettuce (Lactuca serriola)*
Prickly phlox,
[Common] (Leptodactylon
californicum)
Mountain (Leptodactylon
pungens)
San Jacinto (Leptodactylon jaegeri)
Prickly popcorn flower (Cryptantha echinella)
Prickly sow-thistle (Sonchus asper ssp.
asper)*
Prickly-pear,
Chaparral (Opuntia
oricola)
Coast (Opuntia
littoralis)
Desert (Opuntia phaeacantha)
Mojave (Opuntia
erinacea var. erinacea)
Pancake (Opuntia chlorotica)
Vasey's (Opuntia vaseyi)
Western (Opuntia
occidentalis)
Pride of madeira (Echium fastuosum)**
Primrose,
Beach (Camissonia
cheiranthifolia ssp. suffruticosa)
California evening (Oenothera
californica ssp. californica)
Channel Islands beach (Camissonia
cheiranthifolia ssp. cheiranthifolia)
Death Valley brown-eyed (Camissonia
claviformis ssp. funerea)
Desert evening (Oenothera californica
ssp. avita)
Dune (Oenothera deltoides ssp. deltoides)
Eureka Dunes evening (Oenothera
californica ssp. eurekensis)
Hairy evening (Oenothera
elata ssp. hirsutissima)
Hooker's evening (Oenothera
elata ssp. hookeri)
Large yellow (Oenothera
primiveris ssp. bufonis)
Mexican evening (Oenothera
speciosa)**
Mojave brown-eyed (Camissonia
claviformis ssp. claviformis)
Mustard evening (Camissonia
californica)
Pale (Camissonia pallida ssp. pallida)
Peirson's brown-eyed (Camissonia
claviformis ssp. peirsonii)
Rose evening (Oenothera rosea)*
Small evening (Camissonia micrantha)
Spike (Epilobium densiflorum)
Tufted evening (Oenothera caespitosa
ssp. marginata)
Primrose monkeyflower (Mimulus primuloides)
Prince's pine, Little (Chimaphila menziesii)
Prince's plume,
[Common] (Stanleya
pinnata var. pinnata)
Inyo (Stanleya pinnata var. inyoensis)
Panamint (Stanleya elata)
Pringle eriophyllum (Eriophyllum pringlei)
Prostrate amaranth (Amaranthus blitoides)
Prostrate coast goldenbush (Isocoma
menziesii var. sedoides)
Prostrate hutchinsia (Hutchinsia procumbens)
Prostrate navarretia (Navarretia prostrata)
Prostrate spineflower (Chorizanthe
procumbens)
Prostrate spurge (Chamaesyce prostrata)*
Prunus, Desert (Prunus eremophila)
Psoralea, Parish's (Rupertia rigida)
Puff-calyx gilia (Gilia aliquanta ssp.
aliquanta)
Pulicaria (Pulicaria paludosa)*
Puncture vine (Tribulus terrestris)*
Purple bird's beak (Cordylanthus parviflorus)
Purple clarkia (Clarkia
purpurea ssp. quadrivulnera)
Purple everlasting (Gnaphalium purpureum)
Purple false-brome (Brachypodium distachyon)*
Purple false-gilia (Allophyllum divaricatum)
Purple mat (Nama demissum
var. demissum)
Purple Mexican bush sage (Salvia
leucantha cv. "Midnight")
Purple monkeyflower (Mimulus
purpureus)
Purple needlegrass (Nassella pulchra)
Purple nightshade (Solanum
xanti)
Purple nightshade fruit (Solanum xanti)
Purple owl's clover (Castilleja
exserta ssp. exserta)
Purple sage (Salvia leucophylla)
Purple sanicle (Sanicula bipinnatifida)
Purple salsify (Tragopogon porrifolius)*
Pursh's milkvetch (Astragalus purshii
var. lectulus)
Pursh's milkvetch (Astragalus purshii var. tinctus)
Purslane,
[Common] (Portulaca oleracea)*
Lowland (Trianthema portulacastrum)
Purslane speedwell (Veronica peregrina
ssp. xalapensis)
Pussypaws,
[Common] (Calyptridium monospermum)
Parry's (Calyptridium parryi var. parryi)
Pussytoes,
Low (Antennaria dimorpha)
Rosy (Antennaria rosea ssp. confinis)
Pygmy linanthus (Linanthus pygmaeus ssp.
continentalis)
Pygmy madia (Madia minima)
Pygmy poppy (Canbya candida)
Pygmy weed
[Common]
(Crassula connata)
Water (Crassula aquatica)
Pyrrocoma, Bear Valley (Pyrrocoma
uniflora var. gossypina) |