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| scientific name | common name(s) | image gallery |
| Abies concolor | Balsam fir Colorado fir Concolor fir Oyamel de California Silver fir White balsam White fir | |
| Abies lasiocarpa | Subalpine fir | |
| Abronia villosa | Desert sand verbena Desert sand-verbena Desert sandverbena | |
| Acacia angustissima | Prairie acacia Fern acacia Prairie wattle Whiteball acacia | |
| Acacia constricta | Whitethorn acacia White-thorn acacia Mescat acacia Mescat wattle Whitethorn Vara Prieta Chaparro Prieto | |
| Acer glabrum | Rocky Mountain maple | |
| Acacia greggii | Catclaw acacia Gregg acacia Long-flower catclaw Una de gato | |
| Acer grandidentatum | Bigtooth maple Big-toothed maple Canyon maple | |
| Achnatherum hymenoides | Indian ricegrass Indian Millet Sandgrass | |
| Achnatherum speciosum | Desert needlegrass Desert rice grass Spear grass | |
| Agave americana | American century plant Century plant | |
| Agrostis exarata | Spike bentgrass Spiked bent Spike red top | |
| Agave palmeri | Palmer's century plant Palmer agave Blue century plant | |
| Agave parryi | Parry's agave Century plant Parry agave | |
| Agrostis scabra | Fly-away grass Rough bent Rough bentgrass Ticklegrass | |
| Allium cernuum | Nodding onion | |
| Allium macropetalum | Largeflower onion Large-petal onion Desert onion Desert onion lily | |
| Anisacanthus thurberi | Chuparosa Desert honeysuckle Thurber's desert honeysuckle | |
| Anemone tuberosa | Tuber anemone Desert Anemone | |
| Aquilegia chrysantha | Golden columbine Yellow columbine | |
| Arbutus arizonica | Arizona madrone | |
| Artemisia frigida | Prairie sagewort Prairie sagebrush Fringed sage Pasture sage | |
| Artemisia ludoviciana | Louisiana artemisia Louisiana sage White sage Prairie sage Silver sage White sagebrush Louisiana wormwood Silver wormwood Louisiana sagewort Gray sagewort Cudweed sagewort Mugwort wormwood | |
| Arctostaphylos pringlei | Pringle manzanita Pinkbract manzanita | |
| Aristida purpurea | Purple threeawn Purple 3-awn Purple three-awn Red threeawn | |
| Artemisia tridentata | Big sagebrush Great Basin sagebrush | |
| Asclepias asperula ssp. capricornu | Antelopehorns Antelope horns | |
| Asclepias subulata | Rush milkweed Desert milkweed Ajamete | |
| Asclepias tuberosa | Butterflyweed Butterfly milkweed Orange milkweed Pleurisy root | |
| Atriplex hymenelytra | Desert holly Silver holly | |
| Bahia absinthifolia | Hairyseed bahia Hairy-seed false goldfields Bahia Yerba raton | |
| Baileya multiradiata | Desert marigold Showy desert marigold Paper daisy Desert baileya | |
| Bouteloua curtipendula | Sideoats grama | |
| Bouteloua dactyloides | Buffalograss Buffalo grass | |
| Bouteloua eriopoda | Black grama | |
| Bouteloua gracilis | Blue grama | |
| Bouteloua hirsuta | Hairy grama | |
| Bouvardia ternifolia | Scarlet bouvardia Firecracker bush Trompetilla Clavillo | |
| Bursera microphylla | Elephant tree Elephant-tree | |
| Calochortus ambiguus | Doubting mariposa lily | |
| Calliandra eriophylla | Pink fairyduster Fairyduster Mesquitilla Mock mesquite | |
| Castilleja exserta ssp. exserta | Purple owl's clover Owl's clover Exserted indian paintbrush | |
| Carnegiea gigantea | Saguaro | |
| Castilleja indivisa | Entireleaf indian paintbrush Texas paintbrush Indian paintbrush Scarlet paintbrush Entire-leaf indian-paintbrush | |
| Campanula rotundifolia | Bluebell bellflower Bluebell-of-Scotland Harebell | |
| Centaurea americana | American star-thistle Basket-Flower Star thistle Shaving brush American basket-flower | |
| Cercis canadensis var. texensis | Texas redbud | |
| Ceanothus fendleri | Fendler ceanothus Fendler's ceanothus | |
| Ceanothus greggii | Desert ceanothus | |
| Celtis laevigata var. reticulata | Netleaf hackberry Netleaf sugar hackberry Sugar Hackberry Texas Sugarberry Palo Blanco Acibuche | |
| scientific name | common name(s) | image gallery |