Marsh Fleabane

Pluchea odorata

Annual Bursage

Ambrosia acanthicarpa

Beach Bur

Ambrosia chamissonis

White Bursage

Ambrosia dumosa

Woolly Bur-sage

Ambrosia eriocentra

Holly-leaved Bur-sage

Ambrosia ilicifolia

Western Ragweed

Ambrosia psilostachya

Cheesebush

Ambrosia salsola

Five-scaled Burrobrush

Ambrosia salsola var. pentalepis

Burrobrush

Ambrosia salsola var. salsola

Nodding Bur-marigold

Bidens cernua

Sticktight

Bidens frondosa

Bur Marigold

Bidens laevis

Franciscan Thistle

Cirsium andrewsii

Indian Thistle

Cirsium brevistylum

Douglas' Thistle

Cirsium douglasii

Douglas' Thistle

Cirsium douglasii var. douglasii

Fountain Thistle

Cirsium fontinale

Mount Hamilton Fountain Thistle

Cirsium fontinale var. campylon

Crystal Springs Fountain Thistle

Cirsium fontinale var. fontinale

Mojave Thistle

Cirsium mohavense

Desert Thistle

Cirsium neomexicanum

Cobweb Thistle

Cirsium occidentale

Snowy Thistle

Cirsium occidentale var. candidissimum

Compact Cobwebby Thistle

Cirsium occidentale var. compactum

Cobwebby Thistle

Cirsium occidentale var. occidentale

Venus Thistle

Cirsium occidentale var. venustum

Brownie Thistle

Cirsium quercetorum

Fewleaf Thistle

Cirsium remotifolium

Pacific Fringed Thistle

Cirsium remotifolium var. odontolepis

Meadow Thistle

Cirsium scariosum

Rayless Daisy

Erigeron aphanactis

Erigeron aphanactis var. aphanactis

Silver Fleabane

Erigeron argentatus

Streamside Daisy

Erigeron biolettii

Brewer's Fleabane

Erigeron breweri

Coville's Erigeron

Erigeron breweri var. covillei

Brewer's Fleabane

Erigeron breweri var. porphyreticus

Horseweed

Erigeron canadensis

Clokey's Fleabane

Erigeron clokeyi

Pinzl's Fleabane

Erigeron clokeyi var. pinzliae

Spreading Fleabane

Erigeron divergens

Leafy Fleabane

Erigeron foliosus

Leafy Fleabane

Erigeron foliosus var. foliosus

Franciscan Erigeron

Erigeron foliosus var. franciscensis

Seaside Daisy

Erigeron glaucus

Short-rayed Fleabane

Erigeron lonchophyllus

Rockloving Erigeron

Erigeron petrophilus

Rockloving Erigeron

Erigeron petrophilus var. petrophilus

Philadelphia Fleabane

Erigeron philadelphicus

Philadelphia Fleabane

Erigeron philadelphicus var. philadelphicus

Shaggy Fleabane

Erigeron pumilus

Shaggy Fleabane

Erigeron pumilus var. intermedius

Telegraph Weed

Heterotheca grandiflora

Oregon False Goldenaster

Heterotheca oregona

Heterotheca oregona var. scaberrima

False Goldenaster

Heterotheca sessiliflora

Bolander's Goldenaster

Heterotheca sessiliflora ssp. bolanderi

Bristly Goldenaster

Heterotheca sessiliflora ssp. echioides

Camphorweed

Heterotheca subaxillaris