Oemleria cerasiformis (Oso berry)
Oenanthe sarmentosa (Water-parsley)
Oenothera
avita ssp. eurekensis (Eureka
Dunes evening primrose)
californica ssp. avita (Desert
evening primrose)
californica ssp. californica (California
evening primrose)
cavernae (Cave evening primrose)
cespitosa ssp. marginata (Tufted
evening primrose)
deltoides ssp. deltoides (Basket evening
primrose)
elata ssp. hirsutissima (Hairy
evening primrose)
elata ssp. hookeri (Hooker's
evening primrose)
primiveris (Large
yellow primrose)
rosea (Rose
evening primrose)*
sinuosa (Wavyleaf bee blossom)*
suffrutescens (Scarlet gaura)
Oligomeris linifolia (Oligomeris)
Olneya tesota (Desert ironwood)
Oncosiphon piluliferum (Globe chamomile)*
Ophioglossum californicum (California
adder's-tongue) Opuntia
acanthocarpa var. coloradensis, see Cylindropuntia acanthocarpa var. coloradensis
basilaris var. basilaris (Beavertail
cactus)
basilaris var. brachyclada (Short-joint
beavertail cactus)
basilaris var. treleasei (Bakersfield cactus)
bigelovii, see Cylindropuntia bigelovii
chlorotica (Pancake
prickly-pear)
echinocarpa, see Cylindropuntia echinocarpa
erinacea var. erinacea, see Opuntia polyacantha var. erinacea
ficus-indica (Mission
cactus)*
fosburgii, see Cylindropuntia fosburgii
littoralis (Coast
prickly-pear)
oricola (Chaparral
prickly-pear)
parishii, see Grusonia parishii
parryi var. parryi, see Cylindropuntia californica var. parkeri
phaeacantha (Desert
prickly-pear)
polyacantha var. erinacea (Mojave
prickly-pear)
prolifera, see Cylindropuntia prolifera
ramosissima, see Cylindropuntia ramosissima
vaseyi (Vasey's
prickly-pear)
wolfii, see Cylindropuntia wolfii Oreocarya
abortiva (Bownut cryptantha)
confertiflora(Yellow
cryptantha)
flavoculata (Roughseed cryptantha)
tumulosa (New
York Mountains cryptantha)
virginensis (Virgin River cryptantha)
Oreonana vestita (Woolly mountain
parsley)
Oreostemma alpigenum var. andersonii (Alpine
aster)
Ornithostaphylos oppositifolia (Baja
birdbush)
Orobanche, see Aphyllon
Orthilia secunda (One-sided wintergreen)
Osmadenia tenella (Three-spot)
Osmorhiza
berteroi (Mountain
sweet-cicely)
brachypoda (Common sweet-cicely)
chilensis, see Osmorhiza berteroi
Osteospermum ecklonis, see Dimorphotheca ecklonis
Oxalis
albicans ssp. californica, see Oxalis californica
albicans ssp. pilosa, see Oxalis pilosa
californica (California oxalis)
corniculata (Creeping
wood-sorrel)*
pes-caprae (Bermuda
buttercup)*
pilosa (Wild oxalis)
Oxypolis occidentalis (Western cowbane)
Oxytheca
caryophylloides, see Sidotheca caryophylloides
emarginata, see Sidotheca emarginata
parishii var. cienegensis, see Acanthoscyphus parishii var. cienegensis
parishii var. goodmaniana, see
Acanthoscyphus parishii var. goodmaniana
parishii var. parishii, see Acanthoscyphus parishii var. parishii
perfoliata (Roundleaf
oxytheca)
trilobata, see Sidotheca trilobata
Oxytropis oreophila var. oreophila (Mountain oxytrope)
Packera
bernardina (San
Bernardino ragwort)
ionophylla (Tehachapi
ragwort)
multilobata (Basin
butterweed)
Paeonia californica (Wild
peony)
Palafoxia
arida var. arida (Spanish
needles)
arida var. gigantea (Giant
Spanish needles)
Panicum urvilleanum (Desert panic grass)
Papaver
californicum (Fire poppy)
heterophyllum (Wind
poppy)
Parapholis incurva (Curved
sicklegrass)*
Paraserianthes lophantha (Plume
acacia)*
Parietaria
hespera var. hespera (Pellitory)
pensylvanica (Pennsylvania pellitory)
Parkinsonia
florida (Palo
verde)
microphylla (Littleleaf
palo verde)
Parnassia
californica, see Parnassia palustris
palustris (Grass-of-parnassus)
Parthenium argentatum (Guayule)*
Paspalum
dilatatum (Dallis
grass)*
distichum (Knot grass)
Pectis papposa var. papposa (Golden chinch flower)
Pectocarya
heterocarpa (Hairy-leaved
pectocarya)
linearis ssp. ferocula (Slender
pectocarya)
penicillata (Winged
pectocarya)
platycarpa (Broad-fruited
pectocarya)
recurvata (Curvenut
pectocarya)
setosa (Bristly
pectocarya)
Pedicularis
attollens (Little elephant heads)
densiflora (Warrior's plume)
semibarbata (Pine
lousewort)
Pediomelum californicum (California breadroot)
Pelazoneuron puberulum var. sonorensis (Sonoran maiden fern)
Pellaea
andromedifolia (Coffee
fern)
breweri (Brewer's cliffbrake)
mucronata var. californica (California
cliff brake)
mucronata var. mucronata (Bird's-foot
fern)
truncata (Cliff
brake)
Pennisetum
clandestinum (Kikuyu
grass)*
setaceum (Fountaingrass)*
Penstemon
caesius (San
Bernardino beardtongue)
calcareus (Limestone
beardtongue)
californicus (California beardtongue)
centranthifolius (Scarlet
bugler)
clevelandii var. clevelandii (Cleveland's
beardtongue)
clevelandii var. connatus
(San Jacinto beardtongue)
clevelandii var. mohavensis (Mojave beardtongue)
Xdubius (Doubtful penstemon)
eatonii var. undosus (Firecracker
penstemon)
floridus var. austinii
(Austin's
beardtongue) fruticiformis var. fruticiformis (Desert beardtongue)
grinnellii var. grinnellii (Grinnell's
penstemon)
grinnellii var. scrophularioides (Northern Grinnell's penstemon)
heterophyllus var. australis (Southern foothill
penstemon)
heterophyllus var. heterophyllus (Foothill
penstemon)
labrosus (San
Gabriel beardtongue)
laetus var. laetus (Mountain blue penstemon)
newberryi var. newberryi (Pride of the mountains)
palmeri var. palmeri (Palmer's
penstemon)
pseudospectabilis (Desert
penstemon)
rostriflorus (Beaked
penstemon)
speciosus (Royal
penstemon) spectabilis var. spectabilis (Smooth showy
penstemon)
spectabilis var. subviscosus (Glandular showy
penstemon)
stephensii (Stephens' beardtongue)
thompsoniae (Thompson's beardtongue)
thurberi (Thurber's
penstemon)
utahensis (Utah penstemon)
Pentachaeta
aurea ssp. allenii (Allen's daisy)
aurea ssp. aurea (Golden-rayed
pentachaeta)
lyonii (Lyon's
pentachaeta)
Pentagramma
maxonii (Maxon's goldback fern)
rebmanii (Rebman's silverback fern)
triangularis ssp. triangularis (Goldback
fern)
viscosa (Coastal silverback
fern)
Pericome caudata (Mountain tail leaf)
Perideridia
parishii ssp. latifolia (Wide-leaved
Parish's yampah)
parishii ssp. parishii (Parish's
yampah)
pringlei (Adobe yampah)
Perityle emoryi (Rock
daisy)
Persicaria
amphibia (Swamp
knotweed)
capitata (Himalayan
smartweed)*
hydropiper (Water pepper)
lapathifolia (Willow
smartweed)
punctata (Water
smartweed)
Petalonyx
nitidus (Shinyleaf sandpaper plant)
thurberi ssp. thurberi (Sandpaper plant)
Petrophytum caespitosum ssp. caespitosum (Rock spiraea)
Petrorhagia dubia (Hairypink)*
Petunia parviflora (Wild petunia)
Peucephyllum schottii (Desert-fir)
Phacelia
affinis (Limestone
phacelia)
anelsonii (Aven Nelson's phacelia)
austromontana (Southern
mountain phacelia)
bicolor (Two-color phacelia)
brachyloba (Yellow-throated
phacelia)
calthifolia (Caltha-leaved
phacelia)
campanularia var. campanularia (Desert
bluebells)
campanularia var. vasiformis (Funnel bluebells)
cicutaria var. cicutaria (White caterpillar phacelia)
cicutaria var. hispida (Caterpillar
phacelia)
cicutaria var. hubbyi, see Phacelia hubbyi
ciliata (Great valley phacelia)
congdonii (Congdon's phacelia) crenulata var. ambigua (Notch-leaf
phacelia)
crenulata var. crenulata (Cleftleaf wild heliotrope)
crenulata var. minutiflora (Smallflower
notchleaf phacelia)
cryptantha (Hiddenflower phacelia)
curvipes (Curved-stem
phacelia)
davidsonii (Davidson's
phacelia)
distans (Common
phacelia)
douglasii (Douglas phacelia)
egena (Rock
phacelia)
exilis (Lavender
windows)
fremontii (Fremont's
phacelia)
grandiflora (Large-flowered
phacelia)
hastata var. hastata (Timberline
phacelia)
hubbyi (Hubby's
phacelia)
humilis var. dudleyi (Low
phacelia)
imbricata var. imbricata (Mountain
phacelia)
imbricata var. patula (Imbricate
phacelia)
insularis var. insularis (Northern
Channel Islands phacelia)
ivesiana (Ives'
phacelia)
lemmonii (Lemmon's phacelia)
longipes (Longstalk
phacelia)
minor (Canterbury bells)
mohavensis (Mojave
phacelia)
mutabilis (Changeable
phacelia)
nashiana (Charlotte's
phacelia)
neglecta (Alkali phacelia)
pachyphylla (Thick-leaved
phacelia)
parryi (Parry's
phacelia)
pedicellata (Pedicellate phacelia)
perityloides var. perityloides
(Panamint
phacelia)
ramosissima (Branching
phacelia)
rotundifolia (Round-leaved
phacelia)
tanacetifolia (Tansy-leaved
phacelia)
vallis-mortae (Death
Valley phacelia)
viscida var. albiflora (White sticky phacelia)
viscida var. viscida (Sticky
phacelia)
Phalaris aquatica (Harding grass)*
Philadelphus microphyllus (Littleleaf
mock orange)
Phleum alpinum (Mountain
timothy)
Phlox
austromontana (Southern
mountain phlox)
condensata (Condensed
phlox)
diffusa (Spreading
phlox)
dolichantha (Big
Bear Valley phlox)
gracilis, see Microsteris gracilis
stansburyi ssp. stansburyi (Stansbury
phlox)
Pholisma
arenarium (Scaly-stemmed sand plant)
sonorae (Sand food)
Pholistoma
auritum var. auritum (Fiesta
flower)
membranaceum (White
fiesta flower)
Phoradendron
bolleanum (Bolle's
mistletoe)
californicum (Desert
mistletoe)
densum, see Phoradendron bolleanum
juniperinum (Juniper
mistletoe)
leucarpum ssp. macrophyllum (Big-leaf mistletoe)
leucarpum ssp. tomentosum (Oak
mistletoe)
libocedri, see Phoradendron juniperinum
macrophyllum, see Phoradendron serotinum ssp. macrophyllum
pauciflorum, see Phoradendron bolleanum
serotinum ssp. macrophyllum, see P. leucarpum ssp. macrophyllum
serotinum ssp. tomentosum, see P. leucarpum ssp. tomentosum
villosum, see Phoradendron serotinum ssp. tomentosum
Phragmites australis (Common reed)
Phyllodoce breweri (Mountain heather)
Physalis
crassifolia (Thick-leaved
ground-cherry)
hederifolia var. fendleri (Fendler's ground-cherry)
lobata (Lobed ground-cherry)
Physaria
kingii ssp. bernardina (San Bernardino Mountains
bladderpod)
kingii ssp. kingii (King's bladderpod)
tenella (Palmer's beadpod)
Physocarpus
alternans (Nevada ninebark)
capitatus (Pacific ninebark)
Phytolacca americana (Pokeweed)*
Pickeringia
montana var. montana (Chaparral
pea)
montana var. tomentosa (Woolly
chaparral pea)
Picris echioides, see Helminthotheca echioides
Picradeniopsis multiflora (Many-flowered bahia)
Pilostyles thurberi (Thurber's
stemsucker)
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 var. pacifica (Yellow
pine)
quadrifolia (Four-needle
pinyon pine)
sabiniana (Gray pine)
torreyana ssp. insularis (Santa Rosa Island torrey pine)
torreyana ssp. torreyana (Torrey
pine)
Piperia
cooperi (Rein orchid)
elongata (Dense-flowered
rein orchid)
transversa (Royal
rein orchid)
unalascensis (Alaska
rein orchid)
Piptatherum miliaceum, see Stipa miliacea
Plagiobothrys
acanthocarpus (Adobe
popcorn flower)
arizonicus (Arizona
popcorn flower)
canescens var. canescens (Valley
popcorn flower)
collinus var. fulvescens (California
popcorn flower)
fulvus var. campestris (Tawny
popcorn flower)
hispidulus (Harsh popcorn flower)
jonesii, see Simpsonanthus jonesii
nothofulvus (Rusty-haired
popcorn flower)
tenellus (Slender popcorn flower)
undulatus (Hooked
popcorn flower)
Plantago
arenaria (Sand plantain)*
coronopus (Cut-leaf
plantain)*
elongata (Longleaf
plantain)
erecta (California
plantain)
lanceolata (English
plantain)*
major (Broad-leaf
plantain)*
ovata var. fastigiata (Woolly
plantain)
patagonica (Patagonia
plantain)
Platanthera dilatata var. leucostachys (White-flowered
bog orchid)
leucostachys, see Platanthera dilatata var. leucostachys
sparsiflora (Sparse-flowered
bog orchid)
Platanus racemosa (Western sycamore)
Platystemon californicus (Cream
cups)
Plectritis ciliosa (Long-spurred
plectritis)
Pleiacanthus spinosus (Thorny
skeleton-plant)
Pleuraphis rigida, see Hilaria rigida
Pleurocoronis pluriseta (Arrowleaf)
Pluchea
odorata var. odorata (Salt
marsh fleabane)
sericea (Arrow-weed)
Poa
atropurpurea (San
Bernardino bluegrass)
bulbosa ssp. vivipara (Bulbous
bluegrass)*
douglasii (Sand-dune
bluegrass)
fendleriana ssp. longiligula (Fendler's
bluegrass)
infirma (Weak bluegrass)*
pratensis ssp. pratensis (Kentucky bluegrass)*
secunda ssp. juncifolia (Rush
bluegrass)
secunda ssp. secunda (One-sided
bluegrass)
Pogogyne nudiuscula (Otay Mesa mint)
Polemonium occidentale (Western sky pilot)
Polycarpon tetraphyllum ssp. tetraphyllum (Four-leaf
allseed)*
Polygala, see Rhinotropis
Polygonum
amphibium var. emersum, see Persicaria amphibia
arenastrum, see Polygonum aviculare ssp. depressum
aviculare ssp. depressum (Common
knotweed)*
bistortoides, see Bistorta bistortoides
capitatum, see Persicaria capitata
douglasii (Douglas's knotweed)
douglasii ssp. johnstonii, see Polygonum sawatchense ssp. sawatchense
lapathifolium, see Persicaria lapathifolia
polygaloides ssp. kelloggii (Kellogg's knotweed)
punctatum, see Persicaria punctata
sawatchense ssp. sawatchense (Sawatch
knotweed)
Polypodium
californicum (California
polypody)
hesperium (Western
polypody)
Polypogon
interruptus (Ditch
beard grass)*
monspeliensis (Rabbitsfoot
grass)*
viridis (Green
bentgrass)*
Polystichum
imbricans ssp. curtum (Cliff
sword fern)
munitum (Western
sword fern)
scopulinum (Mountain
holly fern) Populus
balsamifera ssp. trichocarpa, see Populus trichocarpa
fremontii ssp. fremontii (Fremont's
cottonwood)
tremuloides (Quaking
aspen)
trichocarpa (Black
cottonwood)
Porophyllum gracile (Slender poreleaf)
Portulaca
halimoides (Desert
portulaca)
oleracea (Purslane)*
Potamogeton diversifolius (Diverse-leaved pondweed)
Potentilla
anserina ssp. anserina (Common silverweed)
anserina ssp. pacifica (Pacific silverweed)
biennis (Biennial cinquefoil)
glandulosa ssp. ewanii, see Drymocallis cuneifolia var. ewanii
glandulosa ssp. glandulosa in part, see Drymocallis glandulosa var. glandulosa (TR, PR)
glandulosa ssp. glandulosa in part, see Drymocallis glandulosa var. wrangelliana (SoCO)
glandulosa ssp. nevadensis, see Drymocallis lactea var. lactea
glandulosa ssp. reflexa in part, see Drymocallis glandulosa var. reflexa (TR, PR)
glandulosa ssp. reflexa in part, see Drymocallis glandulosa var. viscida (TR, PR)
gracilis var. elmeri (Elmer's cinquefoil)
gracilis var. fastigiata (Slender
cinquefoil)
norvegica (Norwegian cinquefoil)*
wheeleri (Wheeler's
cinquefoil)
Prenanthella exigua (Bright white)
Primula
clevelandii var. clevelandii (Shooting
star)
clevelandii var. insularis (Island
shooting star)
fragrans (Fragrant
shooting star)
hendersonii (Foothill
shooting star)
tetrandra (Alpine
shooting star)
Proboscidea althaeifolia (Desert unicorn-plant)
Prosopis
glandulosa var. torreyana (Honey
mesquite)
pubescens (Screwbean
mesquite)
Prunella vulgaris var. lanceolata (Self-heal)
Prunus
andersonii (Desert
peach)
emarginata (Bitter
cherry)
eremophila (Mojave desert
plum)
fasciculata var. fasciculata (Desert
almond)
fremontii (Desert
apricot)
ilicifolia ssp. ilicifolia (Hollyleaf
cherry)
ilicifolia ssp. lyonii (Catalina
cherry)
virginiana var. demissus (Western
chokecherry)
Psathyrotes
annua (Fan leaf)
ramosissima (Turtleback)
Pseudobahia peirsonii (San Joaquin adobe sunburst)
Pseudognaphalium
beneolens
(Fragrant
everlasting)
biolettii (Two-tone
everlasting)
californicum (California
everlasting)
canescens (Wright's cudweed)
luteoalbum (Weedy
cudweed)*
microcephalum (Feltleaf
everlasting)
ramosissimum (Pink
cudweed)
stramineum (Cotton-batting plant)
thermale (Slender
everlasting)
Pseudotsuga macrocarpa (Big-cone douglas fir)
Psilocarphus
brevissimus var. brevissimus (Dwarf
woollyheads)
tenellus (Slender
woollyheads)
Psilostrophe cooperi (Paperflower)
Psorothamnus
arborescens var. minutifolius (Little-leaved
Mojave indigo bush)
arborescens var. simplicifolius (California
indigo bush)
emoryi (Emory
indigo bush)
polydenius (Dotted
indigo bush)
schottii (Schott's
indigo bush)
spinosus (Smoke
tree)
Ptelea crenulata (Hop tree)
Pteridium aquilinum var. pubescens (Bracken
fern)
Pteris vittata (Ladder brake)*
Pterospora andromedea (Pinedrops)
Pterostegia drymarioides (Threadstem)
Pulicaria paludosa (Pulicaria)* Purshia
mexicana var. stansburyana, see Purshia stansburyana
stansburyana (Cliff
rose)
tridentata var. glandulosa (Desert bitterbrush)
Pycnanthemum californicum (Mountain
mint)
Pyrola
asarifolia ssp. asarifolia (Bog
wintergreen)
dentata (Toothed wintergreen)
minor (Lesser wintergreen)
picta (White-veined
wintergreen)
Pyrrocoma
racemosa var. paniculata (Panicled pyrrocoma)
uniflora var. gossypina (Bear
Valley pyrrocoma) |