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)
Engelmann (Quercus engelmannii)
Inland scrub (Quercus
berberidifolia)
Interior live (Quercus wislizeni var.
wislizeni)
Island (Quercus tomentella)
Muller's (Quercus cornelius-mulleri)
Oracle (Quercus Xmorehus)
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 (Notholithocarpus densiflorus)
Torrey's scrub (Quercus acutidens)
Tucker's (Quercus john-tuckeri)
Valley (Quercus lobata)
Oak gooseberry (Ribes quercetorum)
Oak mistletoe (Phoradendron
leucarpum ssp. tomentosum)
Oak violet (Viola purpurea
ssp. quercetorum)
Oats,
Common wild (Avena fatua)*
Slender (Avena barbata)*
Ocotillo (Fouquieria splendens
ssp. splendens)
Ojai fritillary (Fritillaria ojaiensis)
Ojai navarretia (Navarretia ojaiensis)
Oligomeris (Oligomeris linifolia)
Olive, Desert (Forestiera pubescens)
One-flowered fringed gentian, see Hiker's gentian
One-seeded pussypaws (Calyptridium monospermum)
One-sided bluegrass (Poa secunda ssp.
secunda)
One-sided wintergreen (Orthilia secunda)
Onion,
Burlew's (Allium burlewii)
Crested (Allium atrorubens var. cristatum)
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)
Nevada (Allium nevadense)
Parry's fringed (Allium parryi)
Peninsular (Allium peninsulare var. peninsulare)
Red-skinned (Allium
haematochiton)
San Bernardino mountain (Allium
monticola)
Sierra (Allium campanulatum)
Onionweed (Asphodelus fistulosus)*
Oracle oak (Quercus Xmorehus)
Orchard grass (Dactylis glomerata)*
Orchid,
Alaska rein (Piperia unalascensis)
Dense-flowered rein (Piperia elongata)
Rein (Piperia cooperi)
Royal rein (Piperia transversa)
Stream (Epipactis gigantea)
White-flowered bog (Platanthera
dilatata var. leucostachys)
Orchid rock-rose (Cistus Xpurpureus)*
Orcutt's bird's beak (Dicranostegia orcuttiana)
Orcutt's brodiaea (Brodiaea orcuttii)
Orcutt's dudleya (Dudleya attenuata ssp.
orcuttii)
Orcutt's hazardia (Hazardia orcuttii)
Orcutt's woody-aster (Xylorhiza orcuttii)
Orcutt's yellow pincushion (Chaenactis glabriuscula var. orcuttiana)
Oregon cliff fern (Woodsia oregana)
Oregon willow-herb (Epilobium oregonense)
Oriental mustard (Sisymbrium orientale)*
Oso berry (Oemleria cerasiformis)
Otay manzanita (Arctostaphylos otayensis)
Otay Mesa mint (Pogogyne nudiuscula)
Otay tarplant (Deinandra conjugens)
Oval-leaved buckwheat (Eriogonum ovalifolium
var. ovalifolium)
Owl's clover,
Dense-flowered (Castilleja densiflora ssp. gracilis)
Hairy (Castilleja tenuis)
Mojave (Castilleja exserta ssp. venusta)
Purple (Castilleja
exserta ssp. exserta)
San Bernardino Mountains (Castilleja
lasiorhyncha)
Oxalis, Wild (Oxalis californica)
Ox-eye daisy (Leucanthemum vulgare)*
Oxytheca,
Chickweed (Sidotheca caryophylloides)
Cushenbury (Acanthoscyphus parishii var. goodmaniana)
Parish's (Acanthoscyphus
parishii var. parishii)
Roundleaf (Oxytheca perfoliata)
Threelobe (Sidotheca trilobata)
Whitemargin (Sidotheca emarginata)
Oxytrope, Mountain (Oxytropis oreophila var. oreophila)
Pacific blazing star (Mentzelia obscura)
Pacific madrone (Arbutus menziesii)
Pacific mosquito fern (Azolla filiculoides)
Pacific ninebark (Physocarpus
capitatus)
Pacific pickleweed (Salicornia pacifica)
Pacific rush (Juncus effusus ssp. pacificus)
Pacific saltbush (Atriplex pacifica)
Pacific sanicle (Sanicula crassicaulis)
Pacific silverweed (Potentilla anserina ssp. pacifica)
Pacific wildrye (Elymus pacificus)
Paintbrush,
Ashy-gray (Castilleja cinerea)
Coast (Castilleja
affinis ssp. affinis)
Desert (Castilleja
chromosa)
Dwarf alpine (Castilleja nana)
Mount Gleason (Castilleja gleasoni)
Great red (Castilleja miniata)
Heckard's (Castilleja montigena)
Island (Castilleja hololeuca)
Lesser (Castilleja minor
ssp. spiralis)
Longleaf (Castilleja subinclusa ssp. subinclusa)
Martin's (Castilleja applegatei ssp.
martinii)
Narrow-leaved (Castilleja linariifolia)
Soft-leaved (Castilleja
mollis)
Woolly (Castilleja foliolosa)
Yellow (Castilleja plagiotoma)
Pale larkspur (Delphinium parishii ssp. pallidum)
Pale primrose (Camissoniopsis pallida ssp. pallida)
Pale yellow lupine (Lupinus luteolus)
Palmer's beadpod (Physaria tenella)
Palmer's buckwheat (Eriogonum palmerianum)
Palmer's catchfly (Silene bernardina)
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 mallow (Abutilon palmeri)
Palmer's mariposa lily (Calochortus
palmeri var. palmeri)
Palmer's milkvetch (Astragalus palmeri)
Palmer's monkeyflower (Erythranthe palmeri)
Palmer's oak (Quercus palmeri)
Palmer's penstemon (Penstemon palmeri
var. palmeri)
Palmer's sagewort (Artemisia palmeri)
Palmer's sun cup (Tetrapteron palmeri)
Palo verde
[Common] (Parkinsonia florida)
Littleleaf (Parkinsonia microphylla)
Pampas grass (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)
Panicled bulrush (Scirpus microcarpus)
Panicled pyrrocoma (Pyrrocoma racemosa var. paniculata)
Paperbag bush (Scutellaria
mexicana)
Paperflower (Psilostrophe
cooperi)
Papillate dodder (Cuscuta californica
var. papillosa)
Parikh's threadplant (Nemacladus parikhiae)
Parish's bedstraw (Galium parishii)
Parish's bluecurls (Trichostema parishii)
Parish's broomrape (Aphyllon 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 goldeneye (Bahiopsis parishii)
Parish's lomatium (Lomatium nevadense var. parishii)
Parish's lupine (Lupinus
latifolius var. parishii)
Parish's meadowfoam (Limnanthes alba
ssp. parishii)
Parish's milkvetch (Astragalus douglasii var. parishii)
Parish's monkeyflower (Erythranthe parishii)
Parish's needlegrass (Stipa parishii var. parishii)
Parish's nightshade (Solanum parishii)
Parish's oxytheca (Acanthoscyphus parishii var. parishii)
Parish's poppy (Eschscholzia parishii)
Parish's psoralea (Rupertia rigida)
Parish's rock-cress (Boechera parishii)
Parish's sagebrush (Artemisia tridentata
ssp. parishii)
Parish's spurge (Euphorbia parishii)
Parish's tauschia (Tauschia parishii)
Parish's viguiera, see Parish's goldeneye
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 (Frasera parryi)
Parry's hulsea (Hulsea vestita ssp. parryi)
Parry's jepsonia (Jepsonia
parryi)
Parry's linanthus (Linanthus
parryae)
Parry's lip fern (Myriopteris parryi)
Parry's manzanita
(Arctostaphylos parryana ssp. parryana)
Parry's marina (Marina parryi)
Parry's nolina (Nolina parryi)
Parry's phacelia (Phacelia
parryi)
Parry's pussypaws (Calyptridium parryi
var. parryi)
Parry's rabbitbrush (Ericameria parryi
var. aspera)
Parry's saltbush (Atriplex parryi)
Parry's spurge (Euphorbia parryi)
Parry's tetracoccus (Tetracoccus dioicus)
Parry's wild buckwheat (Eriogonum brachypodum)
Parry's wild parsley (Lomatium parryi)
Parry's wirelettuce (Stephanomeria parryi)
Parsley,
Desert (Lomatium mohavense)
Parry's wild (Lomatium parryi)
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)
Peak rush-rose (Crocanthemum
scoparium var. vulgare)
Pearlwort,
Alpine (Sagina
saginoides)
Dwarf (Sagina apetala)*
Western (Sagina decumbens ssp. occidentalis)
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 (Chylismia
claviformis ssp. peirsonii)
Peirson's lupine (Lupinus peirsonii)
Peirson's milkvetch (Astragalus magdalenae var. peirsonii)
Peirson's morning glory (Calystegia peirsonii)
Peirson's spring beauty (Claytonia peirsonii ssp. peirsonii)
Pellitory (Parietaria hespera var. hespera)
Pellitory, Pennsylvania (Parietaria pensylvanica)
Pencil cholla (Cylindropuntia ramosissima)
Peninsular onion (Allium peninsulare var.
peninsulare)
Peninsular spineflower (Chorizanthe leptotheca)
Pennsylvania pellitory (Parietaria pensylvanica)
Pennyroyal,
California false (Hedeoma nana ssp. californica)
Drummond's false (Hedeoma drummondii)
Desert (Monardella
exilis)
Rock (Monardella robisonii)
Penstemon,
Beaked (Penstemon rostriflorus)
Desert (Penstemon pseudospectabilis)
Doubtful (Penstemon Xdubius)
Firecracker (Penstemon
eatonii var. undosus)
Foothill (Penstemon
heterophyllus var. heterophyllus)
Gaping (Keckiella breviflora var. breviflora)
Glandular showy (Penstemon
spectabilis var. subviscosus)
Grinnell's (Penstemon
grinnellii var. grinnellii)
Heartleaf (Keckiella cordifolia)
Little-leaved yellow (Keckiella antirrhinoides var. microphylla)
Mountain blue (Penstemon laetus var. laetus)
Northern Grinnell's (Penstemon grinnellii var. scrophularioides)
Palmer's (Penstemon palmeri var. palmeri)
Royal (Penstemon
speciosus)
Smooth showy (Penstemon spectabilis var. spectabilis)
Southern foothill (Penstemon
heterophyllus var. australis)
Thurber (Penstemon thurberi)
Utah (Penstemon utahensis)
Whorl-leaf (Keckiella ternata var.
ternata)
Yellow (Keckiella antirrhinoides var.
antirrhinoides)
Pentachaeta,
Golden-rayed (Pentachaeta aurea ssp. aurea)
Lyon's (Pentachaeta lyonii)
White-rayed pentachaeta (Pentachaeta aurea ssp. allenii)
Peony, Wild (Paeonia californica)
Pepper,
Brazilian (Schinus terebinthifolius)*
Peruvian (Schinus molle)*
Peppergrass,
Hairy-podded (Lepidium lasiocarpum ssp. lasiocarpum)
Mountain (Lepidium montanum)
Perennial (Lepidium latifolium)*
Shiny (Lepidium)
Virginia (Lepidium virginicum ssp. virginicum)
Wild (Lepidium virginicum ssp. menziesii)
Yellow (Lepidium
flavum)
Perennial chickweed (Cerastium fontanum
ssp. vulgare)*
Perennial peppergrass (Lepidium latifolium)*
Perennial rock-cress (Boechera perennans)
Perennial sweet pea (Lathyrus latifolius)*
Periwinkle (Vinca major)*
Persian speedwell (Veronica persica)*
Peruvian pepper (Schinus molle)*
Petty spurge (Euphorbia peplus)*
Petunia, Seaside (Petunia parviflora)
Phacelia,
Alkali (Phacelia neglecta)
Aven Nelson's (Phacelia anelsonii)
Branching (Phacelia
ramosissima)
Caltha-leaved (Phacelia
calthifolia)
Caterpillar (Phacelia
cicutaria var. hispida)
Changeable (Phacelia mutabilis)
Charlotte's (Phacelia nashiana)
Cleftleaf wild heliotrope (Phacelia crenulata var. crenulata)
Common (Phacelia distans)
Congdon's (Phacelia congdonii)
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 (Phacelia
cicutaria var. hubbyi)
Imbricate (Phacelia imbricata var. patula)
Ives' (Phacelia ivesiana)
Large-flowered (Phacelia
grandiflora)
Lemmon's (Phacelia lemmonii)
Limestone (Phacelia affinis)
Longstalk (Phacelia
longipes)
Low (Phacelia humilis
var. dudleyi)
Mojave (Phacelia mohavensis)
Mountain (Phacelia
imbricata var. 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 var. viscida)
Tansy-leaved (Phacelia tanacetifolia)
Thick-leaved (Phacelia
pachyphylla)
Timberline (Phacelia hastata var. hastata)
Two-color (Phacelia bicolor)
White caterpillar (Phacelia cicutaria var. cicutaria)
White sticky (Phacelia viscida var. albiflora)
Yellow-throated (Phacelia brachyloba)
Phlox,
Big Bear Valley (Phlox dolichantha)
Common slender (Microsteris gracilis)
Condensed (Phlox condensata)
Prickly (Linanthus californicus)
Mountain prickly (Linanthus pungens)
San Jacinto prickly (Linanthus jaegeri)
Southern mountain (Phlox austromontana)
Spreading (Phlox diffusa)
Stansbury (Phlox stansburyi ssp. stansburyi)
Phlox-leaved bedstraw (Galium andrewsii ssp. intermedium)
Pickleweed, Pacific (Salicornia pacifica)
Pigweed amaranth (Amaranthus albus)*
Pincushion,
Desert (Chaenactis stevioides)
Fremont's (Chaenactis
fremontii)
Large-flowered (Chaenactis macrantha)
Orcutt's yellow (Chaenactis glabriuscula var. orcuttiana)
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 ssp. torreyana)
Yellow (Pinus ponderosa var. pacifica)
Pineapple cactus, see Johnson's bee-hive cactus
Pineapple weed (Matricaria discoidea)*
Pinedrops (Pterospora andromedea)
Pine dwarf mistletoe (Arceuthobium
campylopodum)
Pine goldenbush (Ericameria pinifolia)
Pine green-gentian (Frasera
neglecta)
Pinegrove groundsmoke (Gayophytum
oligospermum)
Pineland buckwheat (Eriogonum molestum)
Pine lousewort (Pedicularis semibarbata)
Pine violet (Viola pinetorum ssp. pinetorum)
Pinewoods cryptantha (Cryptantha simulans)
Pinewoods fritillary (Fritillaria
pinetorum)
Pink,
California (Silene laciniata ssp. californica)
Ground (Linanthus dianthiflorus)
Mexican (Silene laciniata
ssp. laciniata)
Windmill (Silene
gallica)*
Pink alumroot (Heuchera rubescens)
Pink-bracted manzanita (Arctostaphylos
pringlei ssp. drupacea)
Pink cudweed (Pseudognaphalium ramosissimum)
Pink fairy duster (Calliandra
eriophylla)
Pink funnel lily (Muilla coronata)
Pink rock-rose (Cistus incanus)*
Pink sand-verbena (Abronia
umbellata var. umbellata)
Pink spineflower (Chorizanthe membranacea)
Pink velvet-mallow (Horsfordia alata)
Pin-point clover (Trifolium
gracilentum)
Pinzl's fleabane (Erigeron clokeyi var. pinzliae)
Pipestems (Clematis lasiantha)
Pipsissewa (Chimaphila umbellata)
Pitcher sage,
Crimson (Salvia spathacea)
Fragrant (Lepechinia fragrans)
Heartleaf (Lepechinia cardiophylla)
Pitch trefoil (Bituminaria bituminosa)*
Pitseed goosefoot (Chenopodium berlandieri)
Plain mariposa lily (Calochortus
invenustus)
Plains flax (Linum puberulum)
Plantain,
Broad-leaf (Plantago major)
California (Plantago
erecta)
Cut-leaf (Plantago
coronopus)*
English (Plantago
lanceolata)*
Longleaf (Plantago elongata)
Patagonia (Plantago
patagonica)
Sand (Plantago arenaria)*
Water (Alisma triviale)
Woolly (Plantago ovata var fastigiata)
Playa milkvetch (Astragalus allochrous var. playanus)
Plectritis, Long-spurred (Plectritis
ciliosa)
Plume acacia (Paraserianthes 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 (Eriodictyon parryi)
Poor man's timothy (Iva hayesiana)
Popcorn flower,
Adobe (Plagiobothrys acanthocarpus)
Arizona (Plagiobothrys
arizonicus)
California (Plagiobothrys collinus
var. fulvescens)
Harsh (Plagiobothrys hispidulus)
Hooked (Plagiobothrys undulatus)
Mojave (Simpsonanthus jonesii)
Rusty-haired (Plagiobothrys
nothofulvus)
Slender (Plagiobothrys tenellus)
Tawny (Plagiobothrys
fulvus var. campestris)
Valley (Plagiobothrys canescens var. canescens)
Poppy,
Bear (Arctomecon merriamii)
Bush (Dendromecon rigida)
California (Eschscholzia
californica)
Channel Island tree (Dendromecon
harfordii)
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)
Tejon (Eschscholzia lemmonii ssp. kernensis)
Tufted (Eschscholzia
caespitosa)
Wind (Papaver heterophyllum)
Poreleaf, Slender (Porophyllum gracile)
Portuguese broom (Cytisus striatus)*
Portulaca, Desert (Portulaca halimoides)
Poverty weed,
[Common] (Iva axillaris)
Nuttall's (Monolepis nuttalliana)
Preuss's milkvetch (Astragalus preussii var. preussii)
Prickleleaf, Shockley's (Hecastocleis
shockleyi)
Pricklepoppy, Mojave (Argemone corymbosa)
Prickly lettuce (Lactuca serriola)*
Prickly-nut cryptantha (Cryptantha muricata var. denticulata)
Prickly-pear,
Chaparral (Opuntia
oricola)
Coast (Opuntia
littoralis)
Desert (Opuntia phaeacantha)
Mojave (Opuntia
polyacantha var. erinacea)
Pancake (Opuntia chlorotica)
Vasey's (Opuntia vaseyi)
Prickly phlox,
[Common] (Linanthus
californicus)
Mountain (Linanthus
pungens)
San Jacinto (Linanthus jaegeri)
Prickly sow-thistle (Sonchus asper ssp.
asper)*
Pride of the mountains (Penstemon newberryi var. newberryi)
Primrose,
Basket evening (Oenothera deltoides ssp. deltoides)
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)
Eureka Dunes evening (Oenothera
californica ssp. eurekensis)
Hairy evening (Oenothera
elata ssp. hirsutissima)
Hooker's evening (Oenothera
elata ssp. hookeri)
Large yellow (Oenothera
primiveris)
Mojave brown-eyed (Camissonia
claviformis ssp. claviformis)
Mustard evening (Camissonia
californica)
Pale (Camissoniopsis 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 (Erythranthe primuloides)
Prince's pine, Little (Chimaphila menziesii)
Prince's plume,
[Common] (Stanleya
pinnata var. pinnata)
Panamint (Stanleya elata)
Pringle's woolly sunflower (Eriophyllum pringlei)
Prostrate coast goldenbush (Isocoma
menziesii var. sedoides)
Prostrate hutchinsia (Hornungia procumbens)
Prostrate navarretia (Navarretia prostrata)
Prostrate spineflower (Chorizanthe
procumbens)
Prostrate spurge (Euphorbia prostrata)*
Providence Mountains milkvetch (Astragalus nutans)
Prunus, Desert (Prunus eremophila)
Psoralea, Parish's (Rupertia rigida)
Puff-calyx gilia (Gilia aliquanta ssp.
aliquanta)
Pulicaria (Pulicaria paludosa)*
Pullup muhly (Muhlenbergia filiformis)
Punchbowl clarkia (Clarkia bottae)
Puncture vine (Tribulus terrestris)*
Purple bird's beak (Cordylanthus parviflorus)
Purple clarkia (Clarkia
purpurea ssp. quadrivulnera)
Purple cudweed (Gamochaeta ustulata)
Purple false-brome (Brachypodium distachyon)*
Purple false-gilia (Allophyllum divaricatum)
Purple mat
[Common]
(Nama demissa
var. demissa)
Coville's (Nama demissa var. covillei)
Purple monkeyflower (Erythranthe
purpurea)
Purple needlegrass (Stipa pulchra)
Purple nightshade (Solanum
xanti)
Purple owl's clover (Castilleja
exserta ssp. exserta)
Purple reedgrass (Calamagrostis purpurascens)
Purple sage (Salvia leucophylla)
Purple salsify (Tragopogon porrifolius)*
Purple sanicle (Sanicula bipinnatifida)
Purpus's gilia (Gilia leptantha ssp. purpusii)
Pursh's milkvetch (Astragalus purshii
var. lectulus)
Purslane,
[Common] (Portulaca oleracea)*
Lowland (Trianthema portulacastrum)
Purslane speedwell (Veronica peregrina
ssp. xalapensis)
Pussypaws,
One-seeded (Calyptridium monospermum)
Parry's (Calyptridium parryi var. parryi)
Pygmy (Calyptridium pygmaeum)
Pussytoes,
Alpine (Antennaria media)
Low (Antennaria dimorpha)
Rosy (Antennaria rosea ssp. confinis)
Pygmy-flower rockjasmine (Androsace septentrionalis)
Pygmy hulsea (Hulsea vestita ssp. pygmaea)
Pygmyleaf, Spreading (Loeflingia squarrosa)
Pygmy linanthus (Leptosiphon pygmaeus ssp.
continentalis)
Pygmy lotus (Acmispon haydonii)
Pygmy madia (Hemizonella minima)
Pygmy poppy (Canbya candida)
Pygmy pussypaws (Calyptridium pygmaeum)
Pygmyweed
Australian (Crassula colligata ssp. lamprosperma)*
[Common]
(Crassula connata)
Water (Crassula aquatica)
Pyrrocoma,
Bear Valley (Pyrrocoma
uniflora var. gossypina)
Panicled (Pyrrocoma racemosa var. paniculata) |