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| scientific name | common name(s) | image gallery |
| Abies amabilis | Cascade fir Lovely fir Pacific silver fir White fir | |
| Abies balsamea | Balsam fir Balsam | |
| Abies bracteata | Bristlecone fir | |
| Abies concolor | Balsam fir Colorado fir Concolor fir Oyamel de California Silver fir White balsam White fir | |
| Abies fraseri | Fraser fir She-balsam | |
| Abies grandis | Giant fir Grand fir | |
| Abies lasiocarpa | Subalpine fir | |
| Abies magnifica | California red fir Red fir | |
| Abies procera | Noble fir | |
| Abronia ameliae | Amelia's sand verbena Heart’s delight Amelia's sand-verbena Sand verbena | |
| Abronia angustifolia | Purple sand verbena Narrow-leaf sand-verbena | |
| Abronia elliptica | Fragrant white sand verbena Snowball Sand Verbena | |
| Abronia fragrans | Fragrant verbena Sand verbena Snowball Snowball sand verbena Sweet sand-verbena | |
| Abronia latifolia | Coastal sand verbena Yellow Sand Verbena | |
| Abronia maritima | Red sand verbena | |
| Abronia mellifera | White sand verbena | |
| Abronia pogonantha | Mojave sand verbena | |
| Abronia umbellata | Beach Sand Verbena Pink sand verbena | |
| Abronia villosa | Desert sand verbena Desert sand-verbena Desert sandverbena | |
| Abronia villosa var. villosa | Desert sand verbena Sand verbena | |
| Abutilon abutiloides | Shrubby Indian mallow | |
| Abutilon fruticosum | Indian mallow Texas Indian mallow | |
| Abutilon hypoleucum | Rio Grande abutilon White-leaf indian-mallow Whiteleaf Indian mallow | |
| Abutilon incanum | Indian mallow Pelotazo Shrubby Indian mallow | |
| Abutilon malacum | Yellow Indian Mallow | |
| Abutilon parvulum | Dwarf Indian mallow | |
| Abutilon trisulcatum | Anglestem Indian Mallow | |
| Abutilon wrightii | Wright's Indian mallow | |
| Acacia angustissima | Prairie acacia Fern acacia Prairie wattle Whiteball acacia | |
| Acacia angustissima var. chisosiana | Chisos Prairie Acacia | |
| Acacia angustissima var. hirta | Prairie acacia | |
| Acacia angustissima var. texensis | Prairie wattle | |
| Acacia berlandieri | Guajillo Berlandier acacia Thornless Catclaw Mimosa Catclaw Round-flowered Catclaw Huajillla Matoral | |
| Acacia constricta | Whitethorn acacia White-thorn acacia Mescat acacia Mescat wattle Whitethorn Vara Prieta Chaparro Prieto | |
| Acacia farnesiana | Huisache Sweet acacia Mealy wattle | |
| Acacia greggii | Catclaw acacia Gregg acacia Long-flower catclaw Una de gato | |
| Acacia greggii var. wrightii | Catclaw acacia Catclaw Wright acacia | |
| Acacia neovernicosa | Viscid acacia | |
| Acacia rigidula | Blackbrush acacia Blackbrush Catclaw Chaparro prieto Gavia | |
| Acacia roemeriana | Roundflower catclaw Round-flower catclaw Roemer acacia Catclaw Roemer’s acacia Catclaw acacia | |
| Acacia schaffneri | Schaffner's wattle Twisted acacia | |
| Acacia schaffneri var. bravoensis | Huisachillo Schaffner's wattle Twisted acacia | |
| Acacia schottii | Schott's Wattle Schott's Acacia | |
| Acacia tortuosa | Huisachillo Poponax | |
| Acalypha californica | California copperleaf | |
| Acalypha gracilens | Slender threeseed mercury | |
| Acalypha monococca | Slender threeseed mercury | |
| Acalypha monostachya | Round copperleaf | |
| Acalypha ostryifolia | Pineland threeseed mercury Hop-hornbeam copperleaf | |
| Acalypha phleoides | Shrubby copperleaf Three-seeded mercury | |
| Acalypha radians | Cardinal's feather Cardinal feather | |
| Acalypha rhomboidea | Common threeseed mercury Virginia threeseed mercury | |
| Acalypha setosa | Cuban Copperleaf | |
| Acalypha virginica | Virginia threeseed mercury | |
| Acamptopappus shockleyi | Shockley's goldenhead | |
| Acanthocereus tetragonus | Triangle Cactus Barbed-wire Cactus Chaco | |
| Acer barbatum | Southern sugar maple Florida maple Caddo maple Rock maple | |
| Acer circinatum | Oregon vine maple Vine maple | |
| Acer glabrum | Rocky Mountain maple | |
| Acer glabrum var. douglasii | Douglas maple | |
| Acer glabrum var. neomexicanum | New Mexico maple | |
| Acer grandidentatum | Bigtooth maple Big-toothed maple Canyon maple | |
| Acer leucoderme | Chalk maple | |
| Acer macrophyllum | Bigleaf maple Big-leaf maple | |
| Acer negundo | Ash-leaf maple Ash-leaved maple Box elder Boxelder Fresno de guajuco | |
| Acer nigrum | Black maple | |
| Acer pensylvanicum | Striped maple Moosewood | |
| Acer rubrum | Red maple Scarlet maple | |
| Acer rubrum var. drummondii | Drummond's maple Drummond red maple Swamp maple | |
| Acer rubrum var. rubrum | Red maple | |
| Acer rubrum var. trilobum | Trident maple Trident red maple | |
| Acer saccharinum | Silver maple Soft maple White maple | |
| Acer saccharum | Sugar maple Northern sugar maple | |
| Acer saccharum var. saccharum | Sugar maple | |
| Acer spicatum | Mountain maple | |
| Achillea millefolium | Common yarrow Yarrow Milfoil Western yarrow | |
| Achillea millefolium var. arenicola | Common yarrow Northern yarrow | |
| Achillea millefolium var. borealis | Boreal Yarrow | |
| Achillea millefolium var. occidentalis | Western yarrow Woolly yarrow White yarrow | |
| Achillea sibirica | Siberian yarrow | |
| Achlys triphylla | Sweet after death Sweet-after-death Vanilla leaf | |
| Achnatherum coronatum | Giant rice grass Giant ricegrass Needle-and-thread grass | |
| Achnatherum hymenoides | Indian ricegrass Indian Millet Sandgrass | |
| Achnatherum lettermanii | Letterman's needlegrass | |
| Achnatherum lobatum | Lobed Needlegrass Littleawn Needlegrass | |
| Achnatherum nelsonii ssp. dorei | Columbia needlegrass Dore's needlegrass | |
| Achnatherum richardsonii | Richardson's needlegrass | |
| Achnatherum robustum | Sleepygrass | |
| Achnatherum speciosum | Desert needlegrass Desert rice grass Spear grass | |
| Achyrachaena mollis | Blow wives | |
| Acleisanthes acutifolia | Needletip trumpets | |
| Acleisanthes longiflora | Angel trumpets Angel's trumpets | |
| Acleisanthes obtusa | Berlandier's trumpets Vine four o'clock | |
| Acleisanthes wrightii | Wright's trumpets | |
| Acmella oppositifolia var. repens | Oppositeleaf spotflower Opposite-leaf spotflower | |
| Acoelorraphe wrightii | Everglades palm | |
| Aconitum columbianum | Columbian monkshood | |
| Aconitum delphiniifolium | Larkspur-leaf monkshood Larkspurleaf monkshood Northern monkshood | |
| Aconitum noveboracense | Northern blue monkshood New York monkshood | |
| Aconitum uncinatum | Southern blue monkshood Monkshood | |
| scientific name | common name(s) | image gallery |