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| scientific name | common name(s) | image gallery |
| Abutilon incanum | Indian mallow Pelotazo Shrubby Indian mallow | |
| Acacia angustissima | Prairie acacia Fern acacia Prairie wattle Whiteball acacia | |
| Acacia berlandieri | Guajillo Berlandier acacia Thornless Catclaw Mimosa Catclaw Round-flowered Catclaw Huajillla Matoral | |
| Acer circinatum | Oregon vine maple Vine maple | |
| Acer negundo | Ash-leaf maple Ash-leaved maple Box elder Boxelder Fresno de guajuco | |
| Actaea racemosa var. racemosa | Black cohosh Black bugbane Bugbane Black snakeroot Fairy candles | |
| Acer rubrum | Red maple Scarlet maple | |
| Acer saccharinum | Silver maple Soft maple White maple | |
| Aesculus californica | California buckeye | |
| Agave deserti | Desert agave Desert century plant Century plant | |
| Agave lechuguilla | Lechuguilla | |
| Agave palmeri | Palmer's century plant Palmer agave Blue century plant | |
| Agave parryi | Parry's agave Century plant Parry agave | |
| Agalinis paupercula var. borealis | Smallflower false foxglove | |
| Agalinis paupercula var. paupercula | Smallflower false foxglove | |
| Agave utahensis | Utah agave | |
| Allowissadula holosericea | Chisos Mountain false Indianmallow Chisos Mtn. False Indian-mallow Velvet-leaf Mallow | |
| Alnus incana ssp. rugosa | Speckled alder | |
| Amelanchier alnifolia | Saskatoon serviceberry Western serviceberry Juneberry | |
| Amphicarpaea bracteata | American hogpeanut | |
| Amorpha fruticosa | Indigo bush False indigo bush False indigo Desert false indigo | |
| Ambrosia trifida | Great ragweed Giant ragweed | |
| Amaranthus tuberculatus | Roughfruit amaranth | |
| Angelica atropurpurea | Purplestem angelica | |
| Andropogon gerardii | Big bluestem Turkeyfoot | |
| Annona glabra | Pond apple | |
| Antennaria howellii ssp. neodioica | Howell's pussytoes | |
| Anaphalis margaritacea | Western pearly everlasting Pearly-everlasting | |
| Antennaria parvifolia | Small-leaf pussytoes Low everlasting Nuttall's pussytoes | |
| Anisacanthus quadrifidus var. wrightii | Flame acanthus Hummingbird bush Wright's desert honeysuckle Wright acanthus Mexican flame Wright's Mexican flame | |
| Apios americana | Groundnut Wild potato Indian potato | |
| Apocynum androsaemifolium | Spreading dogbane Bitterroot Flytrap dogbane | |
| Apocynum cannabinum | Indian hemp Prairie dogbane Dogbane Hemp dogbane | |
| Aquilegia brevistyla | Smallflower columbine | |
| Aquilegia canadensis | Eastern red columbine Wild red columbine | |
| Aquilegia chrysantha var. hinckleyana | Hinckley's golden columbine Yellow columbine Hinckley columbine Capote columbine | |
| Aristolochia californica | California dutchman's pipe | |
| Arabis ×divaricarpa | Spreadingpod rockcress | |
| Aruncus dioicus | Bride's feathers Goat's beard | |
| Aristolochia erecta | Swanflower | |
| Arabis glabra | Tower rockcress | |
| Arbutus menziesii | Pacific madrone Oregon laurel Laurelwood | |
| Arctostaphylos pungens | Pointleaf manzanita Mexican Manzanita | |
| Artemisia tridentata | Big sagebrush Great Basin sagebrush | |
| Arctostaphylos uva-ursi | Kinnikinnick Red bearberry Kinnikinnik | |
| Astragalus alpinus | Alpine milkvetch | |
| Asclepias asperula | Spider milkweed Antelope horns Green-flowered milkweed Spider antelope-horns | |
| Astragalus crassicarpus | Groundplum milkvetch Ground plum | |
| Astragalus drummondii | Drummond's milkvetch | |
| Asclepias incarnata | Swamp milkweed Pink Milkweed | |
| Asclepias ovalifolia | Oval-leaf milkweed Dwarf milkweed | |
| Asclepias speciosa | Showy milkweed | |
| Asclepias sullivantii | Prairie milkweed Sullivant's milkweed Smooth milkweed | |
| Asclepias syriaca | Common milkweed | |
| Asimina triloba | Pawpaw Common paw paw Indian banana | |
| Asclepias tuberosa | Butterflyweed Butterfly milkweed Orange milkweed Pleurisy root | |
| Asclepias verticillata | Whorled milkweed Eastern whorled milkweed | |
| Atriplex canescens | Chamiso Four-wing saltbush Fourwing saltbush Wingscale | |
| Atriplex lentiformis | Big saltbush Coastal quail bush Quailbush Saltbush | |
| Bacopa monnieri | Coastal Water-hyssop Herb-of-grace Water hyssop | |
| Baptisia tinctoria | Horseflyweed Yellow Wild Indigo | |
| Betula alleghaniensis var. alleghaniensis | Yellow birch | |
| Betula lenta | Sweet birch Cherry birch Black birch Mahogany birch | |
| Betula papyrifera | Paper birch Canoe birch White birch | |
| Betula populifolia | Gray birch White birch Aspen-leaved birch | |
| Bidens alba | Common Beggarticks Shepherd's Needles Spanish Needles Butterfly Needles Hairy Beggarticks Romerillo | |
| Bouteloua curtipendula | Sideoats grama | |
| Boehmeria cylindrica | Smallspike false nettle Bog Hemp | |
| Bouteloua gracilis | Blue grama | |
| Bromus anomalus | Nodding brome | |
| Brachyelytrum erectum | Bearded shorthusk Longawn woodgrass | |
| Bromus inermis | Smooth brome | |
| Bursera simaruba | Gumbo limbo Gumbo-limbo | |
| Byrsonima lucida | Locust Berry Long Key locustberry | |
| Carex bigelowii | Bigelow's sedge | |
| Carpinus caroliniana | American hornbeam Blue beech Musclewood Ironwood | |
| Cardamine concatenata | Cutleaf toothwort Pepper root | |
| Camissonia contorta | Plains evening-primrose | |
| Cardamine diphylla | Crinkleroot Two-leaved toothwort Two-leaf toothwort | |
| Castilleja integra | Wholeleaf Indian paintbrush Squawfeather | |
| Callirhoe involucrata | Winecup Purple poppy mallow | |
| Callirhoe involucrata var. lineariloba | Poppy mallow Purple poppymallow White poppy mallow White winecup Winecup | |
| Carex lacustris | Hairy sedge Lakebank sedge | |
| Cassiope mertensiana | Western moss heather Western moss-heather | |
| Calamagrostis purpurascens | Purple reedgrass | |
| Castanea pumila | Chinkapin Allegheny chinquapin Allegheny-chinkapin Chinquapin | |
| Campsis radicans | Trumpet creeper Trumpet vine Common trumpet creeper Cow vine | |
| Carex stricta | Upright sedge Uptight sedge Tussock sedge | |
| Ceanothus americanus | New Jersey tea Redroot | |
| Cercis canadensis var. mexicana | Mexican redbud | |
| Cercis canadensis var. texensis | Texas redbud | |
| Ceanothus cordulatus | Mountain whitethorn Snow bush Whitethorn ceanothus | |
| Ceanothus cuneatus | Buckbrush | |
| Ceanothus fendleri | Fendler ceanothus Fendler's ceanothus | |
| Ceanothus herbaceus | Redroot Prairie redroot Jersey tea Inland Ceanothus Fuzzy Ceanothus | |
| Celtis laevigata | Sugar hackberry Hackberry Sugarberry Texas sugarberry Palo blanco | |
| Celtis lindheimeri | Lindheimer's hackberry Lindheimer hackberry | |
| Cercocarpus montanus | Alderleaf mountain mahogany Alder-leaf mountain-mahogany Mountain mahogany Silverleaf mountain mahogany | |
| Celosia nitida | West Indian cock's comb | |
| Celtis occidentalis | Common hackberry Nettle tree | |
| scientific name | common name(s) | image gallery |