Asteraceae

Wildflowers Dicots Eudicots Asterids Asterales

Asters, daisies, sunflowers, thistles, etc. Generally each “flower” is composed of many miniscule flowers of which there may be two types, tiny “disk” flowers in the middle, and larger “ray” flowers (that often look like normal petals) on the outside. (Some plants have only ray flowers, others only disk, some both types, some have separate male/female flowers where one or the other may not be either ray or disk).

In this coastal tarweed flower you can actually see how the disk flowers are real flowers with five petals. The ray flowers only seem to have one petal (or perhaps several petals fused into one). The branched style is clearly visible at the base of the ray flower, while the fused anthers (in dark purple) are obvious in the middle of the disk flower.

Tribe: Anthemideae (Mayweed)
Achillea Artemisia
Achillea millefolium
Common yarrow

FebOct
Artemisia californica
Old man’s beard

AprOct
Artemisia douglasiana
Mugwort

JuneSep
Cotula Matricaria
Cotula australis
Southern Brass Buttons

FebJune
Cotula coronopifolia
Brass Buttons

All year
Matricaria discoidea
pineapple weed

FebMay
Tribe: Astereae (Aster)
Baccharis
Baccharis pilularis
Coyote Bush

JulyDec
Baccharis plummerae
Plummer’s Baccharis

JulyDec
Baccharis salicifolia
Mulefat

JulyMay
Ericameria
Ericameria arborescens
goldenfleece

SepNov
Ericameria ericoides
Mock Heather

JulyApr
Ericameria nauseosa
Common Rabbit Brush

JanFeb
Erigeron
Erigeron canadensis
Horseweed

AprFeb
Erigeron foliosus
leafy fleabane

AprJan
Erigeron bonariensis
Flax-leaved Horseweed

FebMar
Gutierrezia Hazardia Heterotheca
Gutierrezia californica
California Matchweed

JulyDec
Hazardia squarrosa
sawtooth goldenbush

JulyJan
Heterotheca grandiflora
telegraph weed

All year
Heterotheca Isocoma Rigiopappus
Heterotheca sessiliflora
Hairy Golden Aster

JulyOct
Isocoma menziesii
Menzies’ goldenbush

JuneApr
Rigiopappus leptocladus
Wireweed

April
Solidago Symphyotrichum
Solidago velutina
California goldenrod

All year
Symphyotrichum subulatum
Baby’s breath Aster

SepJan
Tribe: Cichorieae (Chicory)
Agoseris Hieracium
Agoseris grandiflora
California Dandelion

MarJuly
Agoseris heterophylla
Mountain Dandelion

AprJune
Hieracium argutum
Southern Hawkweed

MayOct
Hypochaeris Malacothrix
Hypochaeris glabra
Smooth Cat’s ear

JanJune
Hypochaeris radicata
Hairy Cat’s ear

All year
Malacothrix saxatilis
Cliff-aster

All year
Malacothrix Microseris Picris
Malacothrix saxatilis-saxatilis
Seaside daisy

All year
Microseris lindleyi
Silver Puffs

MarJune
Picris echioides
Prickly ox-tongue

All year
Rafinesquia Sonchus Stephanomeria
Rafinesquia californica
California Chickory

MarJuly
Sonchus sp.
Sow-Thistle

All year
Stephanomeria cichoriacea
Chicory-leaved wire-lettuce

JuneJan
Stephanomeria Taraxacum
Stephanomeria exigua
Small Wirelettuce

JuneSep
Stephanomeria virgata
Tall Stephanomeria

JuneFeb
Taraxacum officionale
Dandelion

FebAug
Tragopogon Lactuca
Tragopogon porrifolius
Purple Salsify

AprSep
Lactuca serriola
Prickly Lettuce

MayJan
Tribe: Coreopsideae (Coreopsis)
Bidens Leptosyne
Bidens pilosa
Beggar’s ticks

All year
Leptosyne bigelovii
Bigelow coreopsis

April
Tribe: Cynareae (Thistle)
Carduus Centaurea
Carduus tenuiflorus
Slender thistle

NovJune
Centaurea melitensis
Maltese star thistle

JanOct
Centaurea solstitialis
Yellow star thistle

MarDec
Cirsium
Cirsium occidentale-californicum
California thistle

MayAug
Cirsium occidentale-venustum
Venus thistle

FebAug
Cirsium vulgare
Bull thistle

JanSep
Silybum
Silybum marianum
milk thistle

All year
Tribe: Helenieae (Sneezeweed)
Chaenactis Helenium Lasthenia
Chaenactis glabriuscula
Yellow Pincushion

MarJune
Helenium puberulum
Sneezeweed

JulyNov
?Lasthenia gracilis
Common Goldfields

MarApr
Tribe: Heliantheae (Sunflower), Sub-tribe: Ambrosiinae (Ragweed)
Ambrosia
Ambrosia chamissonis
beach-bur

JanOct
Ambrosia psilostachya
Western ragweed

MayJan
Ambrosia artemisifolia
Common ragweed

AugJan
Xanthium
Xanthium spinosum
Spiny Clotbur

September
Xanthium strumarium
Cocklebur

FebMar
Tribe: Heliantheae (Sunflower), Sub-tribe: Baeriinae (Wooly Sunflower)
Eriophyllum
Eriophyllum confertiflorum
golden yarrow

All year
Tribe: Heliantheae (Sunflower), Sub-tribe: Eupatorieae
Ageratina Brickellia
Ageratina adenophora
sticky snakeroot

FebOct
Brickellia californica
California Brickellbush

MayDec
Tribe: Heliantheae (Sunflower), Sub-tribe: Heliantheae (Sunflower)
Encelia Venegasia
Encelia californica
Bush sunflower

All year
Venegasia carpesioides
canyon sunflower

All year
Tribe: Heliantheae (Sunflower), Sub-tribe: Madiinae (Tarplant)
Centromadia Deinandra
Centromadia parryi
Southern tarplant

MayFeb
Deinandra fasciculata
clustered tarweed

AprDec
Deinandra increscens
Grassland tarweed

JulyJan
Layia Madia
Layia platyglossa
Tidy Tips

April
Madia elegans
Common Madia

JuneNov
Madia gracilis
slender tarweed

AprJuly
Madia
Madia sativa
Coast tarweed

MayOct
Tribe: Inuleae (Everlasting)
Micropus Pseudognaphalium
Micropus californicus
Slender cottonweed

April
Pseudognaphalium beneolens
fragrant everlasting

DecMay
Pseudognaphalium biolettii
twocolor cudweed

AugMay
Pseudognaphalium
Pseudognaphalium californicum
California pearly everlasting

JanNov
Pseudognaphalium canescens
white everlasting

January
Tribe: Nassauvieae
Acourtia
Acourtia microcephala
Sacapelote

MayAug
Tribe: No Tribe
Jaumea
Jaumea carnosa
Fleshy Jaumea

MayOct
Tribe: NoTribe
Corethrogyne Lepidospartum
Corethrogyne filaginifolia
California Aster

JulyFeb
Lepidospartum squamatum
Scalebroom

September
Tribe: Senecioneae (Senecio)
Delairea Senecio
Delairea odorata
Cape Ivy

NovMay
Senecio flaccidus
threadleaf ragwort

JuneNov
Senecio vulgaris
Old man of Spring

FebMay
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