vera) common marsh poker (Kniphofia linearifolia) onionweed (Asphodelus fistulosus) Aspleniaceae blackstem spleenwort (Asplenium resiliens) Countess Dalhousie's spleenwort (Asplenium dalhousiae) dwarf spleenwort (Asplenium pumilum) little spleenwort (Asplenium exiguum Palmer's spleenwort (Asplenium palmeri) singlesorus spleenwort (Asplenium monanthes) Asteraceae Abert's creeping zinnia (Sanvitalia abertii) African sheepbush (Pentzia incana) alkali marsh aster (Almutaster pauciflorus) American everlasting (Gamochaeta americana) American tarwort (Flourensia cernua) American threefold (Trixis californica) annual candyleaf (Stevia micrantha) annual monsterwort (Parthenice mollis) Apache beggarticks (Bidens ferulaefolia) Apache plant (Guardiola platyphylla) arid tansyaster (Machaeranthera arida) arid throne fleabane (Erigeron arisolius) Arizona baccharis (Baccharis thesioides) Arizona beggarticks (Bidens aurea) Arizona blackfoot (Melampodium longicorne) Arizona blanketflower (Gaillardia arizonica) Arizona cudweed (Pseudognaphalium arizonicum) Arizona fluffweed (Filago arizonica) Arizona snakeweed (Gutierrezia arizonica) Arizona sunflowerweed (Tithonia thurberi) Arizona thistle (Cirsium arizonicum) arrowweed (Pluchea sericea) asthmaweed (Conyza bonariensis) Aztec marigold (Tagetes erecta) Baja bush sunflower (Encelia ventorum) beardless cinchweed (Pectis imberbis) betonyleaf brickellbush (Brickellia betonicifolia) Bigelow's beggarticks (Bidens bigelovii) Bigelow's bristlehead (Carphochaete bigelovii) blessed milkthistle (Silybum marianum) brightwhite (Prenanthella exigua) brittlebush (Encelia farinosa) broom snakeweed (Gutierrezia sarothrae) brownfoot (Acourtia wrightii) brownplume wirelettuce (Stephanomeria pauciflora) brownturbans (Malperia tenuis) burrobush (Ambrosia salsola) burroweed (Ambrosia dumosa) button brittlebush (Encelia frutescens) California brittlebush (Encelia californica) California chicory (Rafinesquia californica) California cottonrose (Filago californica) California goldfields (Lasthenia californica) California rockdaisy (Perityle californica) camphorweed (Heterotheca subaxillaris) Canadian horseweed (Conyza canadensis) canyon ragweed (Ambrosia ambrosioides) Cape marigold (Dimorphotheca tragus) changing fleabane (Erigeron versicolor) chaparral fleabane (Erigeron oreophilus) Chihuahuan fleabane (Erigeron velutipes) chicory (Cichorium intybus) chicoryleaf wirelettuce (Stephanomeria cichoriacea) Cleveland's desertdandelion (Malacothrix clevelandii) coastal tidy tips (Layia platyglossa) Cochise marshtail (Laennecia eriophylla) common goldenbush (Isocoma coronopifolia) common sowthistle (Sonchus oleraceus) common sunflower (Helianthus annuus) common yarrow (Achillea millefolium) common zinnia (Zinnia elegans) Cooper's dogweed (Adenophyllum cooperi) Cooper's goldenbush (Ericameria cooperi) cottonbatting plant (Pseudognaphalium stramineum) Coulter's brickellbush (Brickellia coulteri) Coulter's chinchweed (Pectis coulteri) Coulter's horseweed (Laennecia coulteri) crowndaisy (Glebionis coronaria) Cuman ragweed (Ambrosia psilostachya) cure for all (Pluchea carolinensis) cutleaf ironplant (Xanthisma spinulosum) daisy desertstar (Monoptilon bellidiforme) desert baccharis (Baccharis sergiloides) desertbroom (Baccharis sarothroides) desert coreopsis (Coreopsis bigelovii) desert cudweed (Gamochaeta stagnalis) desert Indianbush (Psacalium decompositum) desert marigold (Baileya multiradiata) desert palafox (Palafoxia arida) desert twinbugs (Dicoria canescens) desert zinnia (Zinnia acerosa) doll's head (Lagascea decipiens) dwarf coyote brush (Baccharis pilularis) dwarf desertpeony (Acourtia nana) dwarf filago (Filago depressa) earleaf brickellbush (Brickellia amplexicaulis) eastern annual saltmarsh aster (Symphyotrichum subulatum) Emory's baccharis (Baccharis salicina) Emory's rockdaisy (Perityle emoryi) espantamula (Acourtia dieringeri) Esteve's pincushion (Chaenactis stevioides) everlasting neststraw (Stylocline gnaphaloides)