Mt. Wilson Trail Plant List

By Latin name

*Acacia baileyana (Cootamundra wattle)
Acer macrophyllum (Bigleaf maple)
Achillea millefolium (Yarrow)
Acmispon glaber var. brevialatus (Short-winged deerweed)
Acmispon glaber var. glaber (Common deerweed)
Acmispon maritimus var. maritimus (Coastal lotus)
Acmispon nevadensis var. davidsonii (Davidson’s lotus)
Acmispon strigosus (Strigose lotus)
Acourtia microcephala (Sacapellote)
Adenostoma fasciculatum (Chamise)
Adiantum aleuticum (Five-finger fern)
*Ageratina adenophora (Thoroughwort*)
Agoseris retrorsa (Retrorse spearleaf mountain dandelion)
Alnus rhombifolia (White alder)
Ambrosia acanthicarpa (Annual bur-sage) (NOT SEEN BUT ON TOM'S PLANT GUIDE)
Amorpha californica var. californica (California false-indigo)
Amsinckia intermedia (Common fiddleneck)
*Anthriscus caucalis (Bur-chervil)
Antirrhinum kelloggii (Twining snapdragon)
Arbutus menziesii (Pacific madrone)
Arctostaphylos glandulosa ssp. mollis (Transverse Range manzanita)
Arctostaphylos glauca (Bigberry manzanita)
Argemone munita (Prickly poppy) (NOT SEEN, INAT REPORT, TO BE EXPECTED)
Artemisia californica (California sagebrush)
Artemisia douglasiana (Mugwort)
Aspidotis californica (California lace fern)
Asterella californica (California liverwort)
Asterella palmeri (Palmer's liverwort)
*Avena barbata (Slender wild oats)
Baccharis salicifolia ssp. salicifolia (Mulefat)
*Bidens pilosa var. pilosa (Common beggarticks)
*Bituminaria bituminosa (Pitch trefoil)
Boechera arcuata (Arching rock-cress)
Boykinia rotundifolia (Round-leaved boykinia)
Brickellia californica (California brickellbush)
Brickellia nevinii (Nevin's brickellbush)
*Bromus diandrus (Ripgut brome)
*Bromus hordeaceus (Soft chess) (NOT SEEN, ON TOM'S PLANT GUIDE)
*Bromus madritensis ssp. rubens (Red brome)
Calocedrus decurrens (Incense-cedar)
Calochortus albus (Fairy lantern)
Calochortus plummerae (Plummer's mariposa lily)
Calyptridium monandrum (Sand cress)
Calystegia macrostegia ssp. arida (Southern California morning glory)
Camissoniopsis confusa (San Bernardino sun cup)
*Capsella bursa-pastoris (Shepherd's purse)
Cardamine californica (Milkmaids)
Cardamine oligosperma (Bittercress)
*Carduus pycnocephalus ssp. pycnocephalus (Italian thistle)
Castilleja applegatei ssp. martinii (Martin's paintbrush)
Caulanthus lasiophyllus (California mustard)
Ceanothus crassifolius var. crassifolius (Hoaryleaf ceanothus)
Ceanothus integerrimus var. macrothyrsus (Deerbrush)
Ceanothus leucodermis (Chaparral whitethorn)
Ceanothus megacarpus var. megacarpus (Bigpod ceanothus)
Ceanothus oliganthus var. oliganthus (Hairyleaf ceanothus)
Ceanothus spinosus (Greenbark ceanothus) (CONFIRM)
*Centaurea melitensis (Tocalote)
Cercocarpus betuloides var. betuloides (Birch-leaf mountain mahogany)
Chaenactis artemisiifolia (White pincushion)
Chaenactis glabriuscula var. glabriuscula (Yellow pincushion)
*Chasmanthe floribunda (African cornflag) (GARDEN ESCAPE)
Chenopodium berlandieri (Pitseed goosefoot) (NEEDS CONFIRMING, collect seeds when available)
*Chenopodium murale (Nettleleaf goosefoot) (NOT SEEN, INAT RECORD)
Chlorogalum pomeridianum var. pomeridianum (Soap plant)
Cirsium occidentale var. occidentale (Cobweb thistle)
Clarkia bottae (Farewell-to-spring)
Clarkia epilobioides (Canyon clarkia)
Clarkia unguiculata (Elegant clarkia)
Claytonia perfoliata ssp. mexicana (Southern miner's lettuce)
Clematis lasiantha (Pipestems)
Collinsia heterophylla var. austromontana (Downy chinese houses)
Collinsia parryi (Parry’s collinsia)
Cordylanthus rigidus ssp. setiger (Bristly bird's beak)
Corethrogyne filaginifolia (California aster)
*Cosmos bipinnatus (Mexican aster) (GARDEN ESCAPE)
*Cotula australis (Australian brass buttons)
*Crassula ovata (Jade) (GARDEN ESCAPE)
Cryptantha intermedia var. intermedia (Large-flowered cryptantha)
Cryptantha microstachys (Tejon cryptantha)
Cryptantha muricata var. jonesii (Jones’ cryptantha)
Cryptantha muricata var. muricata (Showy prickly-nut cryptantha)
Cuscuta carnica var. californica (California dodder)
Cuscuta subinclusa (Canyon dodder)
*Cynodon dactylon (Bermuda grass)
Cystopteris fragilis (Brittle fern)
*Delairea odorata (Cape-ivy)
Delphinium cardinale (Scarlet larkspur)
Delphinium patens ssp. hepaticoideum (Spreading larkspur)
Dichelostemma capitatum ssp. capitatum (Blue dicks)
*Digitalis purpurea (Foxglove) (GARDEN ESCAPE)
Diplacus longiflorus (Bush monkeyflower)
Diplacus brevipes (Yellow monkeyflower)
Drymocallis glandulosa var. glandulosa (Inland sticky cinquefoil)
Dryopteris arguta (Coastal wood fern)
Dudleya cymosa ssp. pumila (Low canyon dudleya)
Dudleya lanceolata (Lanceleaf dudleya)
Elymus glaucus ssp. glaucus (Blue wildrye)
*Elymus hispidus (Intermediate wheat grass)
Emmenanthe penduliflora var. penduliflora (Whispering bells)
Epilobium canum ssp. canum (Hoary fuchsia)
Epilobium canum ssp. latifolium (California fuchsia)
Ericameria cuneata var. cuneata (Rock goldenbush)
Ericameria parishii var. parishii (Parish's goldenbush)
*Erigeron bonariensis (Small horseweed)
Erigeron canadensis (Tall horseweed)
Erigeron foliosus var. foliosus (Leafy daisy)
Eriodictyon parryi (Poodle-dog bush)
Eriodictyon trichocalyx var. trichocalyx (Smoothleaf yerba santa)
Eriogonum davidsonii (Davidson’s buckwheat)
Eriogonum elongatum var. elongatum (Longstem buckwheat)
Eriogonum fasciculatum var. foliolosum (Leafy buckwheat) (toward bottom of trail)
Eriogonum fasciculatum var. polifolium (California wild buckwheat) (toward top of trail)
Eriophyllum confertiflorum var. confertiflorum (Golden yarrow)
*Erodium cicutarium (Redstem filaree)
Erysimum capitatum var. capitatum (Western wallflower)
Erythrantha cardinalis (Scarlet monkeyflower)
Erythranthe guttata (Creek monkeyflower)
Eschscholzia californica (California poppy)
Eucrypta chrysanthemifolia var. chrysanthemifolia (Common eucrypta)
Eulobus californicus (California sun cup)
Euphorbia melanadenia (Red-gland spurge)
*Euphorbia peplus (Petty spurge)
*Festuca perennis (Italian ryegrass)
Frangula californica ssp. californica (Coffeeberry)
Galium angustifolium ssp. angustifolium (Narrow-leaved bedstraw)
Galium aparine (Annual bedstraw)
Galium grande (San Gabriel bedstraw)
Galium porrigens var. porrigens (Graceful bedstraw)
Gilia capitata ssp. abrotanifolia (Globe gilia)
Hazardia squarrosa var. grindelioides (Sawtooth goldenbush)
Helianthus annuus (Common sunflower)
*Hedera helix (English ivy) (GARDEN ESCAPE)
Hesperoyucca whipplei (Chaparral yucca)
Heteromeles arbutifolia (Toyon)
Heuchera elegans (Elegant alumroot)
Hieracium argutum (Hawkweed)
*Hirschfeldia incana (Shortpod mustard)
*Hordeum murinum (Foxtail barley)
Hosackia crassifolia var. crassifolia (Broad-leaved lotus)
Juglans californica (California black walnut)
Keckiella cordifolia (Heartleaf penstemon)
Keckiella ternata var. ternata (Whorl-leaf penstemon)
*Lactuca serriola (Prickly lettuce)
*Lamarckia aurea (Goldentop grass)
*Lantana montevidensis (Trailing lantana)
Lathyrus vestitus var. vestitus (Canyon sweet pea)
Layia glandulosa (White tidy tips)
Lepidium virginicum ssp. menziesii (Wild peppergrass)
Lilium humboldtii ssp. ocellatum (Humboldt lily)
Linanthus californicus (Prickly phlox)
Lithophragma affine (Woodland star)
*Lobularia maritima (Sweet alyssum) (GARDEN ESCAPE)
Logfia filaginoides (California filago)
Lonicera subspicata var. denudata (Southern honeysuckle)
Lupinus hirsutissimus (Stinging lupine)
Lupinus longifolius (Bush lupine)
Lupinus sparsiflorus (Coulter’s lupine)
Lupinus truncatus (Collar lupine)
Malacothrix saxatilis var. tenuifolia (Short-leaved cliff aster)
Malosma laurina (Laurel sumac)
*Malva parviflora (Cheeseweed)
Marah macrocarpa (Wild cucumber)
*Marrubium vulgare (Horehound)
Meconella denticulata (Small-flowered meconella)
*Medicago polymorpha (California bur-clover)
Melica imperfecta (Coast range melic)
Mentzelia laevicaulis (Giant blazing star)
Mentzelia micrantha (Stickleaf)
Mirabilis laevis var. crassifolia (Wishbone bush)
Muilla maritima (Common muilla)
Myriopteris covillei (Coville's lipfern)
Nemophila menziesii var. integrifolia (Baby blue eyes)
*Nerium oleander (Oleander) (GARDEN ESCAPE)
*Nicotiana glauca (Tree tobacco)
*Opuntia ficus-indica (Mission cactus)
Osmorhiza brachypoda (Sweet cicely)
*Oxalis pes-caprae (Bermuda buttercup)
*Papaver orientale (Oriental poppy) (GARDEN ESCAPE)
Pellaea andromedifolia (Coffee fern)
Pellaea mucronata var. mucronata (Birds'-foot fern)
*Peniocereus serpentinus (Snake cactus) (GARDEN ESCAPE)
Penstemon centranthifolius (Scarlet bugler)
Penstemon grinnellii var. grinnellii (Grinnell's penstemon)
Penstemon spectabilis var. subviscosus (Glandular showy penstemon)
Pentagramma triangularis ssp. triangularis (Goldback fern)
Phacelia brachyloba (Yellow-throated phacelia)
Phacelia cicutaria var. hispida (Caterpillar phacelia)
Phacelia distans (Common phacelia)
Phacelia grandiflora (Large-flowered phacelia)
Phacelia imbricata (Mountain phacelia) (San Gabriel species are intergrades)
Phacelia minor (Canterbury bells)
Phacelia ramosissima (Branching phacelia)
*Phoenix canariensis (Canary Island palm) (PLANTED?)
Pholistoma auritum (Fiesta flower)
Phoradendron leucarpum ssp. tomentosum (Oak mistletoe)
*Plumbago auriculata (Cape plumbago) (GARDEN ESCAPE)
Polypodium californicum (California polypody)
Polystichum imbricans ssp. curtum (Cliff sword fern)
Prunus ilicifolia ssp. ilicifolia (Hollyleaf cherry)
Pseudognaphalium beneolens (Fragrant everlasting)
Pseudognaphalium biolettii (Two-tone everlasting)
Pseudognaphalium californicum (California everlasting)
Pseudognaphalium microcephalum (Feltleaf everlasting)
Pseudotsuga macrocarpa (Big-cone douglas fir)
Pterostegia drymarioides (Threadstem)
Quercus agrifolia var. agrifolia (Coast live oak)
Quercus chrysolepis (Canyon live oak)
Quercus durata var. gabrielensis (San Gabriel Mountains leather oak)
Rafinesquia californica (California chicory)
Rhamnus ilicifolia (Hollyleaf redberry)
Rhus ovata (Sugar bush)
Ribes californicum var. hesperium (Hillside gooseberry)
Ribes malvaceum var. viridifolium (Chaparral currant)
*Ricinus communis (Castor bean)
*Rosmarinus officinalis (Rosemary)
Rubus leucodermis (Western raspberry)
Rubus ursinus (California blackberry)
*Salsola tragus (Russian thistle)
Saltugilia splendens ssp. grantii (Grant's woodland-gilia)
Salvia apiana (White sage)
Salvia clevelandii (Cleveland’s sage) (NOT NATIVE TO THIS AREA, PROBABLY GARDEN ESCAPE)
Salvia columbariae (Chia)
Salvia mellifera (Black sage)
Sambucus nigra ssp. caerulea (Mexican elderberry)
Selaginella bigelovii (Bigelow's spike-moss)
Senecio flaccidus var. douglasii (Bush senecio)
*Senecio vulgaris (Common groundsel)
*Silene gallica (Windmill pink)
Silene laciniata ssp laciniata (Mexican pink)
Silene parishii (Parish's catchfly)
*Sinapis arvensis (Charlock) (ONLY SEEN ONCE AND DOUBTFUL)
*Sisymbrium altissimum (Tumble mustard)
*Sisymbrium officinale (Hedge mustard)
*Sisymbrium orientale (Oriental mustard)
Solanum douglasii (White nightshade)
Solanum xanti (Purple nightshade)
Solidago velutina ssp. californica (California goldenrod)
*Sonchus oleraceus (Sow thistle)
*Spartium junceum (Spanish broom)
*Stellaria media (Chickweed)
Stephanomeria cichoriacea (Chicory-leaved stephanomeria)
Stephanomeria virgata ssp. virgata (Twiggy wreathplant)
Stipa coronata (Giant stipa)
*Stipa miliacea var. miliacea (Smilo grass)
Tauschia arguta (Southern tauschia)
Thysanocarpus laciniatus (Lace-pod)
*Torilis arvensis (Field hedge-parsley)
Toxicodendron diversilobum (Western poison oak)
*Trifolium hirtum (Rose clover)
Turritis glabra (Tower mustard)
Umbellularia californica (California bay)
*Vinca major (Periwinkle)
Woodwardia fimbriata (Giant chain fern)
*Zantedeschia aethiopica (Calla lily) (PROBABLY PLANTED)

By common name

*African cornflag (Chasmanthe floribunda)
Annual bedstraw (Galium aparine)
Annual bur-sage (Ambrosia acanthicarpa) (NOT SEEN BUT ON TOM'S PLANT GUIDE)
Arching rock-cress (Boechera arcuata)
*Australian brass-buttons (Cotula australis)
Baby blue eyes (Nemophila menziesii var. integrifolia)
*Beggarticks, Common (Bidens pilosa var. pilosa)
*Bermuda buttercup (Oxalis pes-caprae)
*Bermuda grass (Cynodon dactylon)
Bigberry manzanita (Arctostaphylos glauca)
Big-cone douglas fir (Pseudotsuga macrocarpa)
Bigelow’s spike-moss (Selaginella bigelovii)
Bigleaf maple (Acer macrophyllum)
Bigpod ceanothus (Ceanothus megacarpus var. megacarpus)
Birchleaf mountain mahogany (Cercocarpus betuloides var. betuloides)
Bird’s-foot fern (Pellaea mucronata var. mucronata)
Bittercress (Cardamine oligosperma)
Black sage (Salvia mellifera)
Blue dicks (Dichelostemma capitatum ssp. capitatum)
Blue wildrye (Elymus glaucus ssp. glaucus)
Branching phacelia (Phacelia ramosissima)
Bristly bird’s beak (Cordylanthus rigidus ssp. setiger)
Brittle fern (Cystopteris fragilis)
Broad-leaved lotus (Hosackia crassifolia var. crassifolia)
*Bur-chervil (Anthriscus caucalis)
Bush lupine (Lupinus longifolius)
Bush monkeyflower (Diplacus aurantiacus)
Bush senecio (Senecio flaccidus var. douglasii)
California brickellbush (Brickellia californica)
California aster (Corethrogyne filaginifolia)
California bay (Umbellularia californica)
California black walnut (Juglans californica)
California blackberry (Rubus ursinus)
California bur-clover (Medicago polymorpha)
California chicory (Rafinesquia californica)
California dodder (Cuscuta carnica var. californica)
California everlasting (Pseudognaphalium californicum)
California false-indigo (Amorpha californica var. californica)
*California filago (Logfia filaginoides)
California fuchsia (Epilobium canum ssp. latifolium)
California goldenrod (Solidago velutina ssp. californica)
California lace fern (Aspidotis californica)
California liverwort (Asterella californica)
California mustard (Caulanthus lasiophyllus)
California polypody (Polypodium californicum)
California poppy (Eschscholzia californica)
California sagebrush (Artemisia californica)
California sun cup (Eulobus californicus)
California wild buckwheat (Eriogonum fasciculatum var. polifolium) (toward top of trail)
*Calla lily (Zantedeschia aethiopica) (PLANTED OR GARDEN ESCAPE)
*Canary Island palm (Phoenix canariensis) (PLANTED?)
Canterbury bells (Phacelia minor)
Canyon clarkia (Clarkia epilobioides)
Canyon dodder (Cuscuta subinclusa)
Canyon live oak (Quercus chrysolepis)
Canyon sweet pea (Lathyrus vestitus var. vestitus)
*Cape-ivy (Delairea odorata)
*Cape plumbago (Plumbago auriculata) (GARDEN ESCAPE)
*Castor bean (Ricinus communis)
Caterpillar phacelia (Phacelia cicutaria var. hispida)
Chamise (Adenostoma fasciculatum)
Chaparral currant (Ribes malvaceum var. viridifolium)
Chaparral whitethorn (Ceanothus leucodermis)
Chaparral yucca (Hesperoyucca whipplei)
*Charlock (Sinapis arvensis) (only seen once and doubtful ID)
*Cheeseweed (Malva parviflora)
Chia (Salvia columbariae)
*Chickweed (Stellaria media)
Chicory-leaved stephanomeria (Stephanomeria cichoriacea)
Cleveland’s sage (Salvia clevelandii)
Cliff sword fern (Polystichum imbricans ssp. curtum)
Coastal lotus (Acmispon maritimus var. maritimus)
Coastal wood fern (Dryopteris arguta)
Coast live oak (Quercus agrifolia var. agrifolia)
Coast range melic (Melica imperfecta)
Cobweb thistle (Cirsium occidentale var. occidentale)
Coffeeberry (Frangula californica ssp. californica)
Coffee fern (Pellaea andromedifolia)
Collar lupine (Lupinus truncatus)
Common sunflower (Helianthus annuus)
Cootamundra wattle  (*Acacia baileyana)
Coulter’s lupine (Lupinus sparsiflorus)
Coville’s lipfern (Myriopteris covillei)
Creek monkeyflower (Erythranthe guttata)
Davidson’s buckwheat (Eriogonum davidsonii)
Davidson’s lotus (Acmispon nevadensis var. davidsonii)
Deerbrush (Ceanothus integerrimus var. macrothyrsus)
Deerweed, Common (Acmispon glaber var. glaber)
Deerweed, Short-winged (Acmispon glaber var. brevialatus)
Downy Chinese houses (Collinsia heterophylla var. austromontana)
Elegant alumroot (Heuchera elegans)
Elegant clarkia (Clarkia unguiculata)
*English ivy (Hedera helix)
Eucrypta, Common (Eucrypta chrysanthemifolia var. chrysanthemifolia)
Fairy lantern (Calochortus albus)
Farewell-to-spring (Clarkia bottae)
Feltleaf everlasting (Pseudognaphalium microcephalum)
Fiddleneck, Common (Amsinckia intermedia)
*Field hedge-parsley (Torilis arvensis)
Fiesta flower (Pholistoma auritum)
Five-finger fern (Adiantum aleuticum)
*Foxglove (Digitalis purpurea)
*Foxtail barley (Hordeum murinum)
Fragrant everlasting (Pseudognaphalium beneolens)
Giant blazing star (Mentzelia laevicaulis)
Giant chain fern (Woodwardia fimbriata)
Giant stipa (Stipa coronata)
Glandular showy penstemon (Penstemon spectabilis var. subviscosus)
Globe gilia (Gilia capitata ssp. abrotanifolia)
Goldback fern (Pentagramma triangularis ssp. triangularis)
Golden yarrow (Eriophyllum confertiflorum var. confertiflorum)
*Goldentop grass (Lamarckia aurea)
Graceful bedstraw (Galium porrigens var. porrigens)
Grant’s woodland-gilia (Saltugilia splendens ssp. grantii)
Greenbark ceanothus (Ceanothus spinosus) (CONFIRM)
Grinnell’s penstemon (Penstemon grinnellii var. grinnellii)
*Groundsel, Common (Senecio vulgaris)
Hairyleaf ceanothus (Ceanothus oliganthus var. oliganthus)
Hawkweed (Hieracium argutum)
Heartleaf penstemon (Keckiella cordifolia)
*Hedge mustard (Sisymbrium officinale)
Hillside gooseberry (Ribes californicum var. hesperium)
Hoary fuchsia (Epilobium canum ssp. canum)
Hoaryleaf ceanothus (Ceanothus crassifolius var. crassifolius)
Hollyleaf cherry (Prunus ilicifolia ssp. ilicifolia)
Hollyleaf redberry (Rhamnus ilicifolia)
*Horehound (Marrubium vulgare)
Humboldt lily (Lilium humboldtii ssp. ocellatum)
Incense cedar (Calocedrus decurrens)
Inland sticky cinquefoil (Drymocallis glandulosa var. glandulosa)
*Intermediate wheat grass (Elymus hispidus)
*Italian ryegrass (Festuca perennis)
*Italian thistle (Carduus pycnocephalus ssp. pycnocephalus)
*Jade (Crassula ovata)
Jones’ cryptantha (Cryptantha muricata var. jonesii)
Lace-pod (Thysanocarpus laciniatus)
Lanceleaf dudleya (Dudleya lanceolata)
Large-flowered cryptantha (Cryptantha intermedia var. intermedia)
Large-flowered phacelia (Phacelia grandiflora)
Laurel sumac (Malosma laurina)
Leafy buckwheat (Eriogonum fasciculatum var. foliolosum) (toward bottom of trail)
Leafy daisy (Erigeron foliosus var. foliosus)
Liverworts (Asterella?)
Longstem buckwheat (Eriogonum elongatum var. elongatum)
Low canyon dudleya (Dudleya cymosa ssp. pumila)
Martin’s paintbrush (Castilleja applegatei ssp. martinii)
*Mexican aster (Cosmos bipinnatus)
Mexican elderberry (Sambucus nigra ssp. caerulea)
Mexican pink (Silene laciniata ssp laciniata)
*Mexican poppy (Papaver orientale) (GARDEN ESCAPE)
Milkmaids (Cardamine californica)
*Mission cactus (Opuntia ficus-indica)
Mountain phacelia (Phacelia imbricata) (San Gabriel species are intergrades)
Mugwort (Artemisia douglasiana)
Muilla, Common (Muilla maritima)
Mulefat (Baccharis salicifolia ssp. salicifolia)
Narrow-leaved bedstraw (Galium angustifolium ssp. angustifolium)
*Nettleleaf goosefoot (Chenopodium murale) NO PICTURES, INAT RECORD
Nevin's brickellbush (Brickellia nevinii)
Oak mistletoe (Phoradendron leucarpum ssp. tomentosum)
*Oleander (Nerium oleander) (GARDEN ESCAPE)
*Oriental mustard (Sisymbrium orientale)
*Oriental poppy (Papaver orientale) (GARDEN ESCAPE)
Pacific madrone (Arbutus menziesii)
Palmer's liverwort (Asterella palmeri)
Parish’s catchfly (Silene parishii)
Parish’s goldenbush (Ericameria parishii var. parishii)
Parry’s collinsia (Collinsia parryi)
*Periwinkle (Vinca major)
*Petty spurge (Euphorbia peplus)
Phacelia, Common (Phacelia distans)
Pipestems (Clematis lasiantha)
*Pitch trefoil (Bituminaria bituminosa)
Pitseed goosefoot (Chenopodium berlandieri) (NEEDS CONFIRMING, collect seeds when available)
Plummer's mariposa lily (Calochortus plummerae)
Poodle-dog bush (Eriodictyon parryi)
*Prickly lettuce (Lactuca serriola)
Prickly phlox (Linanthus californicus)
Prickly poppy (Argemone munita) NO PICTURES BUT INAT REPORT, TO BE EXPECTED
Purple nightshade (Solanum xanti)
*Red brome (Bromus madritensis ssp. rubens)
Red-gland spurge (Euphorbia melanadenia)
*Redstem filaree (Erodium cicutarium)
Retrorse spearleaf mountain dandelion (Agoseris retrorsa)
*Ripgut brome (Bromus diandrus)
Rock goldenbush (Ericameria cuneata var. cuneata)
*Rose clover (Trifolium hirtum)
*Rosemary (Rosmarinus officinalis)
Round-leaved boykinia (Boykinia rotundifolia)
*Russian thistle (Salsola tragus)
Sacapellote (Acourtia microcephala)
San Bernardino sun cup (Camissoniopsis confusa)
San Gabriel bedstraw (Galium grande)
San Gabriel Mountains leather oak (Quercus durata var. gabrielensis)
Sand cress (Calyptridium monandrum)
Sawtooth goldenbush (Hazardia squarrosa var. grindelioides)
Scarlet bugler (Penstemon centranthifolius)
Scarlet larkspur (Delphinium cardinale)
Scarlet monkeyflower (Erythranthe cardinalis)
*Shepherd’s purse (Capsella bursa-pastoris)
Short-leaved cliff aster (Malacothrix saxatilis var. tenuifolia)
*Shortpod mustard (Hirschfeldia incana)
Showy prickly-nut cryptantha (Cryptantha muricata var. muricata)
*Slender wild oats (Avena barbata)
Small-flowered meconella (Meconella denticulata)
*Small horseweed (Erigeron bonariensis)
*Smilo grass (Stipa miliacea var. miliacea)
Smoothleaf yerba santa (Eriodictyon trichocalyx var. trichocalyx)
*Snake cactus (Peniocereus serpentinus) (GARDEN ESCAPE)
Soap plant (Chlorogalum pomeridianum var. pomeridianum)
*Soft chess (Bromus hordaceus) (NOT SEEN, ON TOM'S PLANT GUIDE)
Southern California morning glory (Calystegia macrostegia ssp. arida)
Southern honeysuckle (Lonicera subspicata var. denudata)
Southern miner’s lettuce (Claytonia perfoliata ssp. mexicana)
Southern tauschia (Tauschia arguta)
*Sow thistle (Sonchus oleraceus)
*Spanish broom (Spartium junceum)
Spreading larkspur (Delphinium patens ssp. hepaticoideum)
Stickleaf (Mentzelia micrantha)
Stinging lupine (Lupinus hirsutissimus)
Strigose lotus (Acmispon strigosus)
Sugarbush (Rhus ovata)
Sunflower, Common (Helianthus annuus) (NOT SEEN, ON TOM’S LIST)
*Sweet alyssum (Lobularia maritima) (GARDEN ESCAPE)
Sweet cicely (Osmorhiza brachypoda)
Tall horseweed (Erigeron canadensis)
Tejon cryptantha (Cryptantha microstachys)
*Thoroughwort (Ageratina adenophora)
Threadstem (Pterostegia drymarioides)
*Tocalote (Centaurea melitensis)
Tower mustard (Turritis glabra)
Toyon (Heteromeles arbutifolia)
*Trailing lantana (Lantana montevidensis)
Transverse Range manzanita (Arctostaphylos glandulosa ssp. mollis)
*Tree tobacco (Nicotiana glauca)
*Tumble mustard (Sisymbrium altissimum)
Twiggy wreathplant (Stephanomeria virgata ssp. virgata)
Twining snapdragon (Antirrhinum kelloggii)
Two-tone everlasting (Pseudognaphalium biolettii)
Western poison oak (Toxicodendron diversilobum)
Western raspberry (Rubus leucodermis)
Western wallflower (Erysimum capitatum var. capitatum)
Whispering bells (Emmenanthe penduliflora var. penduliflora)
White alder (Alnus rhombifolia)
White nightshade (Solanum douglasii)
White pincushion (Chaenactis artemisiifolia)
White sage (Salvia apiana)
White tidy tips (Layia glandulosa)
Whorl-leaf penstemon (Keckiella ternata var. ternata)
Wild cucumber (Marah macrocarpa)
Wild peppergrass (Lepidium virginicum ssp. menziesii)
*Windmill pink (Silene gallica)
Wishbone bush (Mirabilis laevis var. crassifolia)
Woodland star (Lithophragma affine)
Yarrow (Achillea millefolium)
Yellow monkeyflower (Diplacus brevipes)
Yellow pincushion (Chaenactis glabriuscula var. glabriuscula)
Yellow-throated phacelia (Phacelia brachyloba)

Three species seen on nearby Bailey Canyon Trail not yet seen on the Mt. Wilson Trail that might be expected to be there

Eschscholzia caespitosa
Hosackia crassifolia var. crassifolia
Uropappus lindleyi

Below is a list of vouchered specimens going back many years that Tom Chester compiled of species that may or may not have been correctly identified and may or may not have been seen on the trail itself or in nearby areas, and/or that might be expected to be seen.

Acacia baileyana
Acacia redolens
Acanthoscyphus parishii var. parishii
Acer macrophyllum
Acmispon argophyllus var. argophyllus
Acmispon glaber var. brevialatus
Acmispon heermannii var. heermannii
Acmispon maritimus
Acmispon nevadensis var. davidsonii
Adenostoma fasciculatum
Aesculus californica
Alnus rhombifolia
Amorpha californica var. californica
Anthriscus caucalis
Antirrhinum multiflorum
Aralia californica
Arbutus menziesii
Arctostaphylos glandulosa ssp. glandulosa
Arctostaphylos glauca
Artemisia californica
Aspidotis californica
Bituminaria bituminosa
Boykinia rotundifolia
Brickellia californica
Brickellia nevinii
Bromus ciliatus
Bromus grandis
Bromus porteri
Bromus pseudolaevipes
Calochortus albus
Calystegia macrostegia ssp. arida
Calystegia macrostegia ssp. intermedia
Cardamine oligosperma
Castilleja applegatei ssp. martinii
Caulanthus heterophyllus
Ceanothus crassifolius var. crassifolius
Ceanothus cyaneus
Ceanothus integerrimus var. macrothyrsus
Ceanothus leucodermis
Ceanothus megacarpus var. megacarpus
Ceanothus oliganthus var. oliganthus
Cercocarpus betuloides var. betuloides
Cheilanthes covillei
Clarkia bottae
Clarkia epilobioides
Clarkia unguiculata
Claytonia perfoliata ssp. intermontana
Collinsia heterophylla
Cotoneaster pannosus
Cryptantha intermedia var. intermedia
Delphinium patens ssp. hepaticoideum
Dichelostemma capitatum ssp. capitatum
Drymocallis glandulosa var. glandulosa
Dryopteris arguta
Dudleya cymosa ssp. pumila
Dudleya lanceolata
Dysphania pumilio
Ehrharta erecta
Elymus condensatus
Epilobium canum ssp. canum
Epilobium ciliatum ssp. ciliatum
Ericameria parishii var. parishii
Erigeron foliosus var. foliosus
Eriodictyon crassifolium var. crassifolium
Eriodictyon crassifolium var. nigrescens
Eriogonum elongatum var. elongatum
Eriogonum fasciculatum var. foliolosum
Eucalyptus polyanthemos
Eucrypta chrysanthemifolia var. chrysanthemifolia
Eulobus californicus
Galium angustifolium ssp. angustifolium
Galium californicum ssp. flaccidum
Galium grande
Hazardia squarrosa var. grindelioides
Helianthemum scoparium var. vulgare
Heteromeles arbutifolia
Heterotheca grandiflora
Heuchera elegans
Juncus textilis
Keckiella cordifolia
Koeleria macrantha
Lantana montevidensis
Lathyrus vestitus var. vestitus
Lepechinia fragrans
Lepidium didymum
Linanthus californicus
Lithophragma affine
Lithophragma bolanderi
Lobularia maritima
Lolium perenne ssp. multiflorum
Lonicera subspicata var. denudata
Lupinus longifolius
Lupinus truncatus
Malosma laurina
Melica imperfecta
Mentzelia micrantha
Mimulus aurantiacus
Muhlenbergia microsperma
Nemophila menziesii var. menziesii
Nicotiana glauca
Osmorhiza brachypoda
Paeonia californica
Pellaea andromedifolia
Penstemon centranthifolius
Penstemon heterophyllus var. australis
Penstemon spectabilis var. subviscosus
Persicaria hydropiperoides
Phacelia cicutaria var. hispida
Phacelia grandiflora
Phacelia minor
Phacelia ramosissima
Phoenix canariensis
Poa secunda ssp. secunda
Polycarpon tetraphyllum var. tetraphyllum
Polygala cornuta var. fishiae
Polypodium californicum
Prunus ilicifolia ssp. ilicifolia
Pseudognaphalium californicum
Pseudognaphalium microcephalum
Pseudotsuga macrocarpa
Quercus agrifolia var. agrifolia
Quercus chrysolepis
Quercus dumosa
Quercus durata var. gabrielensis
Quercus durata var. gabrielensis X Q. engelmannii
Quercus engelmannii
Quercus wislizeni var. frutescens
Rafinesquia californica
Rhamnus ilicifolia
Rhus ovata
Ribes amarum
Ribes californicum var. hesperium
Ribes malvaceum var. viridifolium
Ribes roezlii var. roezlii
Ricinus communis
Rupertia physodes
Salvia mellifera
Sambucus nigra ssp. caerulea
Selaginella bigelovii
Senecio astephanus
Senecio flaccidus var. douglasii
Silene gallica
Silene laciniata ssp. laciniata
Solanum douglasii
Solanum umbelliferum
Solidago confinis
Stachys albens
Stachys bullata
Stephanomeria cichoriacea
Stipa coronata
Stipa lepida
Stipa miliacea var. miliacea
Symphoricarpos mollis
Tauschia arguta
Toxicodendron diversilobum
Trifolium hirtum
Trifolium microcephalum
Umbellularia californica
Vitis girdiana