Cliff aster (Malacothrix saxatilis)
Composite or sunflower family -- Asteraceae

September 1, 2015.Moonridge Trail

Color: White

Native 

Clustered tarweed (Deinandra fasciculata)

Composite or sunflower family -- Asteraceae

September 1, 2015.  Moonridge Trail

Native

Seed head

Sacapellote (Acourtia microcephala)

Composite and sunflower family -- Asteraceae

September 1, 2015.  Moonridge Trail

Native

California brickellbush (Brickellia californica)
Composite or sunflower family -- Asteraceae

September 1, 2015. Moonridge Trail

Native

Coastal sage brush (Artemisia californica)

Composite or sunflower family -- Asteraceae

September 1, 2015. Moonridge Trail

Native

Shrub

Flax-leaved horseweed (Erigeron bonariensis)
Composite or sunflower family -- Asteraceae
September 1, 2015.  Mesa Trail
Color: White

Non-native

Common sandaster (Corethrogyne flaginifolia)
Composite or sunflower family -- Asteraceae
September 1, 2015.  Mesa Trail
Color: Purple

Native

Mule fat or seep willow (Baccharis salicifolia)
Composite or sunflower family -- Asteraceae
September 1, 2015. Mesa Trail
Color: White
Seed head
Native

Tocalote (Centaurea melitensis)

Composite or sunflower family -- Asteraceae

August 9, 2015. Upper Santa Rosa Trail

Seed head

Invasive

Common sandaster (Corethrogyne flaginifolia)
Composite or sunflower family -- Asteraceae
August 9, 2015. Upper Santa Rosa Trail
Color: Purple
Native

Small wirelettuce or whiteplume wirelettuce (Stephanomeria exigua)
Composite or sunflower family -- Asteraceae

August 9, 2015. Upper Santa Rosa Trail

Color: White, Purple

Native

Cliff aster (Malacothrix saxatilis)
Composite or sunflower family -- Asteraceae

August 9, 2015.Upper Santa Rosa Trail

Color: White

Native 

Prickly lettuce (Lactuca serriola)
Composite or sunflower family -- Asteraceae
August 9, 2015. Upper Santa Rosa Trail
Invasive

Clustered tarweed (Deinandra fasciculata)

Composite or sunflower family -- Asteraceae

August 9, 2015.  Upper Santa Rosa Trail

Color: Yellow

Native

Seed head

Saw-toothed goldenbush, sawtooth bristleweed (Hazardia squarrosa)

Composite or sunflower family -- Asteraceae

August 9, 2015.  Upper Santa Rosa Trail

Color: Yellow

Shrub

Native

Coastal sage brush (Artemisia californica)

Composite or sunflower family -- Asteraceae

August 9, 2015.  Upper Santa Rosa Trail

Native

Shrub

California encelia, California brittlebush, or bush sunflower (Encelia californica)
Composite or sunflower family -- Asteraceae
August 9, 2015, Upper Santa Rosa Trail
Color: Yellow
Seed head

Native

Clustered tarweed (Deinandra fasciculata)

Composite or sunflower family -- Asteraceae

July 8, 2015.  Upper Santa Rosa Trail

Color: Yellow

Native

Seed head