of Orange County, California and nearby places. Characteristics
Compiled by Peter J. Bryant, School of Biological Sciences, University of California, Irvine, Irvine, CA 92697.
To comment, mailto:pjbryant@uci.edu. Glossary. Other sources
*, exotic species; Red background: invasive species on the RED ALERT Emergent Invasives list (California Native Plant Society, Orange County Chapter); +, listed species
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Common Yarrow,
Achillea millefolium
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Blow wives,
Achyrachaena mollis
Sacapellote (Perezia),
Acourtia microcephala
* Russian Knapweed,
Acroptilon repens
Sticky Snakeroot,
Ageratina adenophora
Bigflower Agoseris,
Agoseris grandiflora
Mountain Dandelion,
Agoseris heterophylla
Mountain Dandelion,
Agoseris retrorsa
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Coast Weed,
Amblyopappus pusillus
Flatspine Burr Ragweed,
Ambrosia acanthicarpa
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Beach-bur,
Ambrosia chamissonis
Weakleaf Bur Ragweed,
Ambrosia confertiflora
+ Singlewhorl burrobrush,
Ambrosia monogyra
Western ragweed,
Ambrosia psilostachya
Woolly Fishhooks,
Ancistrocarphus filagineus
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* Mayweed,
Anthemis cotula
* Canary Island Margeurite, Argyranthemum foeniculaceum
Rayless Arnica,
Arnica discoidea
Biennial wormwood, Artemisia biennis
California sagebrush,
Artemisia californica
Mugwort,
Artemisia douglasiana
Tarragon,
Artemisia dracunculus
Great Basin Sagebrush,
Artemisia tridentata
Saltmarsh baccharis,
Baccharis glutinosa
Coyote Brush,
Baccharis pilularis
Mulefat,
Baccharis salicifolia
Willow Baccharis,
Baccharis salicina
Broom Baccharis,
Baccharis sarothroides
San Diego County Sunflower, Bahiopsis laciniata
Sweetbush,
Bebbia juncea
Common Daisy,
Bellis perennis
Devil's beggarticks, Bidens frondosa
Bur-marigold,
Bidens laevis
Cobbler's Pegs,
Bidens pilosa
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California Brickelbush,
Brickellia californica
Nevin's brickellbush,
Brickellia nevinii
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* Italian Thistle,
Carduus pycnocephalus
Blessed thistle,
Centaurea benedicta
* North African Knapweed, Centaurea diluta
* Tocalote,
Centaurea melitensis
* Yellow Star-thistle,
Centaurea solstitialis
+ Southern tarplant,
Centromadia parryi ssp. australis
Common Tarweed,
Centromadia pungens ssp. laevis
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White Pincushion,
Chaenactis artemisiifolia
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Yellow Pincushion,
Chaenactis glabriuscula
* Boneseed,
Chrysanthemoides monilifera
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California Thistle, Cirsium occidentale var. californicum
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Cobweb Thistle, Circium occidentale var. occidentale
* Bull thistle,
Cirsium vulgare
Giant Coreopsis,
Coreopsis gigantea
Beach Coreopsis,
Coreopsis maritima
California aster,
Corethrogyne filaginifolia
* Southern Waterbuttons,
Cotula australis
* Brass-buttons,
Cotula coronopifolia
* Artichoke Thistle,
Cynara cardunculus
Slender tarplant,
Deinandra fasciculata
Kellogg's Tarplant,
Deinandra kelloggii
+ San Diego tarplant,
Deinandra paniculata
* Cape Ivy,
Delairea odorata
Cape marigold,
Dimorphotheca sinuata
* Stinkwort,
Dittrichia graveolens
False Daisy,
Eclipta prostrata
Bush sunflower,
Encelia californica
Brittlebush,
Encelia farinosa
Putative hybrid,
Encelia californica x farinosa
Rubber Rabbitbrush,
Ericameria nauseosa
Palmer's Goldenbush,
Ericameria palmeri
Parish's Goldenbush,
Ericameria parishii
Pine Goldenbush,
Ericameria pinifolia
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* Small Horseweed,
Erigeron bonariensis
Tall horseweed, Erigeron canadensis
* Tropical Horseweed,
Erigeron floribunda
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Leafy Daisy,
Erigeron foliosus
Golden yarrow,
Eriophyllum confertiflorum
Western goldenrod,
Euthamia occidentalis
Treasure flower,
Gazania linearis
* Garland Chrysanthemum,
Glebionis coronaria
Western Marsh Cudweed,
Gnaphalium palustre
Gumplant,
Grindelia camporum
California Matchweed,
Gutierrezia californica
Snakeweed,
Gutierrezia sarothrae
Saw-toothed Goldenbush, Hazardia squarrosa var. grindelioides
* Crete weed,
Hedypnois cretica
Rosilla,
Helenium puberulum
Common Sunflower,
Helianthus annuus
Slender Sunflower,
Helianthus gracilentus
* Bristly Ox-tongue,
Helminthotheca echioides
Clustered Tarweed,
Hemizonia fasciculata
Telegraph weed,
Heterotheca grandiflora
Bristly Goldenaster, Heterotheca sessiliflora ssp. echioides
Graceful Tarplant,
Holocarpha virgata ssp. elongata
Red-rayed Hulsea,
Hulsea heterochroma
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* Smooth Cat's Ear,
Hypochaeris glabra
* False Dandelion, Hypochaeris radicata
Menzies' Goldenbush,
Isocoma menziesii
Poverty Weed,
Iva axillaris
San Diego Poverty weed,
Iva hayesiana
Marsh jaumea (Salty Susan),
Jaumea carnosa
* Prickly lettuce,
Lactuca serriola
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Coulter's Horseweed,
Laennecia coulteri
Royal Goldfields,
Lasthenia coronaria
Coulter's Goldfields,
Lasthenia glabrata ssp. coulteri
Needle Goldfields,
Lasthenia gracilis
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White Tidy Tips,
Layia glandulosa
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Yellow Tidy Tips,
Layia platyglossa
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Scale-broom,
Lepidospartum squamatum
Leptosyne californica
Valley Lessingia,
Lessingia glandulifera
California Cottonrose,
Logfia filaginoides
* Narrowleaf Cottonrose, Logfia gallica
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Elegant Madia,
Madia elegans
Small Tarweed,
Madia exigua
Grassy Tarweed,
Madia gracilis
Coast Tarweed,
Madia sativa
Cleveland's Dandelion,
Malacothrix clevelandii
Cliff Desert Dandelion (Cliff Aster),
Malacothrix saxatilis
Disc Mayweed,
Matricaria discoidea
* Pineapple weed,
Matricaria matricarioides
Cotton Top,
Micropus californicus
Douglas' silverpuffs, Microseris douglasii ssp. platycarpha
Grassland silverpuffs,
Microseris heterocarpa
Silver Puffs,
Microseris (Uropappus) lindleyi
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* Stinknet,
Oncosiphon piluliferum
False Rosinweed,
Osmadenia tenella
* Trailing African Daisy, Osteospermum fruticosa
* African daisy,
Osteospermum ecklonis
* Santa Maria Feverfew,
Parthenium hysterophorus
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Allen's Daisy,
Pentachaeta aurea ssp. allenii
Cobweb Bush,
Plecostachys serpyllifolia
Salt Marsh Fleabane,
Pluchea odorata
Arrow Weed,
Pluchea sericea
Slender Poreleaf,
Porophyllum gracile
Fragrant Everlasting, Pseudognaphalium beneolens
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Two-tone Everlasting, Pseudognaphalium biolettii
California everlasting, Pseudognaphalium californicum
Wright's Cudweed, Pseudognaphalium canescens
White Cudweed,
Pseudognaphalium leucocephalum
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* Weedy Cudweed, Pseudognaphalium luteoalbum
Felt-leaf or White Everlasting, Pseudognaphalium microcephalum
Pink cudweed, Pseudognaphalium (=Gnaphalium) ramosissimum
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Cotton-batting Plant, Pseudognaphalium stramineum
Short Woollyheads,
Psilocarphus brevissimus
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Slender Woolly-heads,
Psilocarphus tenellus
* Spanish sunflower,
Pulicaria paludosa
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California Chicory,
Rafinesquia californica
California ragwort,
Senecio californicus
Threadleaf Groundsel,
Senecio flaccidus
* Australian Fireweed,
Senecio linearifolius
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* Common Groundsel,
Senecio vulgaris
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* Milk thistle,
Silybum marianum
California Goldenrod,
Solidago velutina ssp. californica
* Prickly sow-thistle,
Sonchus asper
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* Common sow-thistle,
Sonchus oleraceus
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Brown (derived) Microseris, Stebbinsoseris heterocarpa
Chicoryleaf Wirelettuce, Stephanomeria cichoriacea
Twiggy wreathplant,
Stephanomeria diegensis
Deane's wirelettuce,
Stephanomeria exigua deanei
Rod Wirelettuce,
Stephanomeria virgata
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Everlasting Nest-straw,
Stylocline gnaphaloides
+ San Bernardino aster, Symphyotrichum defoliatum
Slender Aster,
Symphyotrichum subulatum
* Feverfew,
Tanacetum parthenium
Red-seeded Dandelion,
Taraxacum erythrospermum
* Common Dandelion,
Taraxacum officinale
Hairy Horsebrush,
Tetradymia comosa
* Yellow Salsify,
Tragopogon dubius
* Purple Salsify,
Tragopogon porrifolius
Canyon Sunflower,
Venegasia carpesioides
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+ Big-leaved Crown-beard,
Verbesina dissita
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* Golden Crownbeard,
Verbesina encelioides
Mediterranean desert knapweed, Volutaria tubuliflora
Southern Mule Ears,
Wyethia ovata
Spiny Cocklebur,
Xanthium spinosum
Rough Cocklebur,
Xanthium strumarium