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| scientific name | common name(s) | image gallery |
| Antennaria plantaginifolia | Plantain-leaf Pussytoes Woman's tobacco Ladies' tobacco Everlasting Mouse ear | |
| Antennaria rosea | Rosy pussytoes | |
| Antennaria rosea ssp. pulvinata | Pulvinate pussytoes | |
| Antennaria solitaria | Singlehead pussytoes | |
| Antheropeas lanosum | White easterbonnets | |
| Antheropeas wallacei | Woolly easterbonnets Woolly daisy | |
| Anulocaulis leiosolenus | Southwestern ringstem | |
| Aphanostephus pilosus | Hairy dozedaisy | |
| Aphanostephus ramosissimus | Plains dozedaisy Lazy daisy | |
| Aphanostephus ramosissimus var. ramosissimus | Plains dozedaisy | |
| Aphanostephus riddellii | Lazy Daisy Riddell's dozedaisy | |
| Aphanostephus skirrhobasis | Lazy daisy Arkansas lazy daisy Arkansas dozedaisy | |
| Apios americana | Groundnut Wild potato Indian potato | |
| Aplectrum hyemale | Adam and Eve | |
| Apocynum androsaemifolium | Spreading dogbane Bitterroot Flytrap dogbane | |
| Apocynum cannabinum | Indian hemp Prairie dogbane Dogbane Hemp dogbane | |
| Apocynum × floribundum | Hybrid Dogbane Intermediate Dogbane | |
| Apodanthera undulata | Melon loco | |
| Aquilegia brevistyla | Smallflower columbine | |
| Aquilegia caerulea | Colorado blue columbine Rocky Mountain columbine | |
| Aquilegia canadensis | Eastern red columbine Wild red columbine | |
| Aquilegia chrysantha | Golden columbine Yellow columbine | |
| Aquilegia chrysantha var. chaplinei | Chaplin's yellow columbine Chaplin's golden columbine Chaplin's columbine Chapline columbine Guadalupe Mountain columbine | |
| Aquilegia chrysantha var. hinckleyana | Hinckley's golden columbine Yellow columbine Hinckley columbine Capote columbine | |
| Aquilegia elegantula | Western red columbine | |
| Aquilegia eximia | Van Houtte's columbine Serpentine columbine | |
| Aquilegia flavescens | Yellow mountain columbine Yellow columbine Golden columbine | |
| Aquilegia formosa | Western columbine Crimson columbine Scarlet columbine Red columbine | |
| Aquilegia jonesii | Jones' columbine Blue limestone columbine | |
| Aquilegia longissima | Longspur columbine Longspur yellow columbine | |
| Aquilegia micrantha | Mancos columbine | |
| Aquilegia pubescens | Sierra columbine Sierran columbine | |
| Aquilegia saximontana | Rocky Mountain blue columbine Alpine blue columbine | |
| Aquilegia scopulorum | Utah columbine | |
| Aquilegia triternata | Chiricahua Mountain columbine | |
| Arabis aculeolata | Waldo rockcress | |
| Arabis alpina | Alpine rockcress | |
| Arabis blepharophylla | Rose rockcress | |
| Arabis canadensis | Sicklepod | |
| Arabis drummondii | Drummond's rockcress | |
| Arabis glabra | Tower rockcress | |
| Arabis hirsuta | Hairy rockcress | |
| Arabis hirsuta var. pycnocarpa | Creamflower rockcress | |
| Arabis holboellii | Holboell's rockcress | |
| Arabis kamchatica | Kamchatica rockcress | |
| Arabis laevigata var. laevigata | Smooth Rockcress | |
| Arabis lyallii | Lyall's rockcress | |
| Arabis lyrata | Lyrate rockcress Lyre-leaf Rockcress | |
| Arabis petiolaris | Brazos rockcress Rock-cress Brazos rock-cress | |
| Arabis sparsiflora | Sicklepod rockcress | |
| Arabis ×divaricarpa | Spreadingpod rockcress | |
| Aralia californica | California spikenard | |
| Aralia hispida | Bristly sarsaparilla | |
| Aralia nudicaulis | Wild sarsaparilla | |
| Aralia racemosa | American spikenard | |
| Aralia racemosa ssp. racemosa | American spikenard | |
| Aralia spinosa | Devil's walkingstick Devil’s walking-stick Prickly Ash Hercules club Angelica tree | |
| Arbutus arizonica | Arizona madrone | |
| Arbutus menziesii | Pacific madrone Oregon laurel Laurelwood | |
| Arbutus xalapensis | Texas madrone Madrone Naked indian Manzanita | |
| Arceuthobium douglasii | Douglas fir dwarf mistletoe Douglas-fir Dwarf Mistletoe | |
| Arceuthobium pusillum | Eastern dwarf mistletoe | |
| Arctagrostis latifolia | Broad-leaf arctic-bent Polar grass Wideleaf polargrass | |
| Arctomecon californica | California bearpoppy | |
| Arctomecon humilis | Common bearpoppy | |
| Arctomecon merriamii | Desert bearpoppy Great Desert Poppy | |
| Arctostaphylos alpina | Alpine bearberry | |
| Arctostaphylos bakeri | Baker's manzanita | |
| Arctostaphylos canescens | Hoary manzanita | |
| Arctostaphylos columbiana | Hairy manzanita | |
| Arctostaphylos densiflora | Vine Hill manzanita | |
| Arctostaphylos edmundsii | Little Sur manzanita | |
| Arctostaphylos glandulosa | Eastwood's manzanita | |
| Arctostaphylos glauca | Bigberry manzanita Blue manzanita | |
| Arctostaphylos hookeri | Hooker's manzanita Monterey manzanita | |
| Arctostaphylos manzanita | Whiteleaf manzanita Big manzanita Manzanita | |
| Arctostaphylos nevadensis | Pinemat manzanita | |
| Arctostaphylos pajaroensis | Pajaro manzanita | |
| Arctostaphylos patula | Greenleaf manzanita Green-leaf manzanita | |
| Arctostaphylos pringlei | Pringle manzanita Pinkbract manzanita | |
| Arctostaphylos pungens | Pointleaf manzanita Mexican Manzanita | |
| Arctostaphylos rubra | Red fruit bearberry Alpine bearberry Arctic bearberry Red manzanita Ravenberry | |
| Arctostaphylos uva-ursi | Kinnikinnick Red bearberry Kinnikinnik | |
| Ardisia escallonoides | Island marlberry Marbleberry Marlberry | |
| Arenaria aculeata | Prickly Sandwort | |
| Arenaria benthamii | Hilly sandwort | |
| Arenaria capillaris | Beautiful Sandwort Slender mountain sandwort | |
| Arenaria capillaris ssp. americana | Fescue Sandwort | |
| Arenaria congesta | Ballhead sandwort | |
| Arenaria fendleri | Fendler's sandwort | |
| Arenaria lanuginosa | Spreading sandwort | |
| Arenaria livermorensis | Livermore sandwort | |
| Arethusa bulbosa | Dragon's mouth Swamp Pink | |
| Argemone aenea | Golden pricklypoppy | |
| Argemone albiflora | Bluestem pricklypoppy White pricklypoppy | |
| Argemone albiflora ssp. texana | Bluestem pricklypoppy White pricklypoppy | |
| Argemone aurantiaca | Texas pricklypoppy | |
| Argemone chisosensis | Chisos Mountain pricklypoppy | |
| Argemone corymbosa | Mojave pricklypoppy | |
| Argemone hispida | Rough pricklypoppy | |
| scientific name | common name(s) | image gallery |